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From agoncha...@apache.org
Subject [38/79] [abbrv] incubator-ignite git commit: IGNITE-386: Squashed changes.
Date Fri, 06 Mar 2015 06:48:50 GMT
http://git-wip-us.apache.org/repos/asf/incubator-ignite/blob/6423cf02/modules/hadoop/src/main/java/org/apache/ignite/hadoop/fs/v1/IgniteHadoopFileSystem.java
----------------------------------------------------------------------
diff --git a/modules/hadoop/src/main/java/org/apache/ignite/hadoop/fs/v1/IgniteHadoopFileSystem.java b/modules/hadoop/src/main/java/org/apache/ignite/hadoop/fs/v1/IgniteHadoopFileSystem.java
new file mode 100644
index 0000000..93c0df4
--- /dev/null
+++ b/modules/hadoop/src/main/java/org/apache/ignite/hadoop/fs/v1/IgniteHadoopFileSystem.java
@@ -0,0 +1,1237 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.hadoop.fs.v1;
+
+import org.apache.hadoop.conf.*;
+import org.apache.hadoop.fs.*;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.permission.*;
+import org.apache.hadoop.hdfs.*;
+import org.apache.hadoop.mapreduce.*;
+import org.apache.hadoop.util.*;
+import org.apache.ignite.*;
+import org.apache.ignite.igfs.*;
+import org.apache.ignite.internal.igfs.common.*;
+import org.apache.ignite.internal.processors.hadoop.*;
+import org.apache.ignite.internal.processors.hadoop.igfs.*;
+import org.apache.ignite.internal.processors.igfs.*;
+import org.apache.ignite.internal.util.typedef.*;
+import org.apache.ignite.internal.util.typedef.internal.*;
+import org.jetbrains.annotations.*;
+
+import java.io.*;
+import java.net.*;
+import java.util.*;
+import java.util.concurrent.atomic.*;
+
+import static org.apache.ignite.configuration.FileSystemConfiguration.*;
+import static org.apache.ignite.igfs.IgfsMode.*;
+import static org.apache.ignite.internal.processors.hadoop.fs.HadoopParameters.*;
+import static org.apache.ignite.internal.processors.hadoop.igfs.HadoopIgfsUtils.*;
+import static org.apache.ignite.internal.processors.igfs.IgfsEx.*;
+
+/**
+ * {@code IGFS} Hadoop 1.x file system driver over file system API. To use
+ * {@code IGFS} as Hadoop file system, you should configure this class
+ * in Hadoop's {@code core-site.xml} as follows:
+ * <pre name="code" class="xml">
+ *  &lt;property&gt;
+ *      &lt;name&gt;fs.default.name&lt;/name&gt;
+ *      &lt;value&gt;igfs://ipc&lt;/value&gt;
+ *  &lt;/property&gt;
+ *
+ *  &lt;property&gt;
+ *      &lt;name&gt;fs.igfs.impl&lt;/name&gt;
+ *      &lt;value&gt;org.apache.ignite.hadoop.fs.v1.IgniteHadoopFileSystem&lt;/value&gt;
+ *  &lt;/property&gt;
+ * </pre>
+ * You should also add Ignite JAR and all libraries to Hadoop classpath. To
+ * do this, add following lines to {@code conf/hadoop-env.sh} script in Hadoop
+ * distribution:
+ * <pre name="code" class="bash">
+ * export IGNITE_HOME=/path/to/Ignite/distribution
+ * export HADOOP_CLASSPATH=$IGNITE_HOME/ignite*.jar
+ *
+ * for f in $IGNITE_HOME/libs/*.jar; do
+ *  export HADOOP_CLASSPATH=$HADOOP_CLASSPATH:$f;
+ * done
+ * </pre>
+ * <h1 class="header">Data vs Clients Nodes</h1>
+ * Hadoop needs to use its FileSystem remotely from client nodes as well as directly on
+ * data nodes. Client nodes are responsible for basic file system operations as well as
+ * accessing data nodes remotely. Usually, client nodes are started together
+ * with {@code job-submitter} or {@code job-scheduler} processes, while data nodes are usually
+ * started together with Hadoop {@code task-tracker} processes.
+ * <p>
+ * For sample client and data node configuration refer to {@code config/hadoop/default-config-client.xml}
+ * and {@code config/hadoop/default-config.xml} configuration files in Ignite installation.
+ */
+public class IgniteHadoopFileSystem extends FileSystem {
+    /** Internal property to indicate management connection. */
+    public static final String IGFS_MANAGEMENT = "fs.igfs.management.connection";
+
+    /** Empty array of file block locations. */
+    private static final BlockLocation[] EMPTY_BLOCK_LOCATIONS = new BlockLocation[0];
+
+    /** Empty array of file statuses. */
+    public static final FileStatus[] EMPTY_FILE_STATUS = new FileStatus[0];
+
+    /** Ensures that close routine is invoked at most once. */
+    private final AtomicBoolean closeGuard = new AtomicBoolean();
+
+    /** Grid remote client. */
+    private HadoopIgfsWrapper rmtClient;
+
+    /** User name for each thread. */
+    private final ThreadLocal<String> userName = new ThreadLocal<String>(){
+        /** {@inheritDoc} */
+        @Override protected String initialValue() {
+            return DFLT_USER_NAME;
+        }
+    };
+
+    /** Working directory for each thread. */
+    private final ThreadLocal<Path> workingDir = new ThreadLocal<Path>(){
+        /** {@inheritDoc} */
+        @Override protected Path initialValue() {
+            return getHomeDirectory();
+        }
+    };
+
+    /** Default replication factor. */
+    private short dfltReplication;
+
+    /** Base file system uri. */
+    @SuppressWarnings("FieldAccessedSynchronizedAndUnsynchronized")
+    private URI uri;
+
+    /** Authority. */
+    private String uriAuthority;
+
+    /** Client logger. */
+    private IgfsLogger clientLog;
+
+    /** Secondary URI string. */
+    private URI secondaryUri;
+
+    /** IGFS mode resolver. */
+    private IgfsModeResolver modeRslvr;
+
+    /** Secondary file system instance. */
+    private FileSystem secondaryFs;
+
+    /** Management connection flag. */
+    private boolean mgmt;
+
+    /** Whether custom sequential reads before prefetch value is provided. */
+    private boolean seqReadsBeforePrefetchOverride;
+
+    /** IGFS group block size. */
+    private long igfsGrpBlockSize;
+
+    /** Flag that controls whether file writes should be colocated. */
+    private boolean colocateFileWrites;
+
+    /** Prefer local writes. */
+    private boolean preferLocFileWrites;
+
+    /** Custom-provided sequential reads before prefetch. */
+    private int seqReadsBeforePrefetch;
+
+    /** The cache was disabled when the instance was creating. */
+    private boolean cacheEnabled;
+
+    /** {@inheritDoc} */
+    @Override public URI getUri() {
+        if (uri == null)
+            throw new IllegalStateException("URI is null (was IgniteHadoopFileSystem properly initialized?).");
+
+        return uri;
+    }
+
+    /**
+     * Enter busy state.
+     *
+     * @throws IOException If file system is stopped.
+     */
+    private void enterBusy() throws IOException {
+        if (closeGuard.get())
+            throw new IOException("File system is stopped.");
+    }
+
+    /**
+     * Leave busy state.
+     */
+    private void leaveBusy() {
+        // No-op.
+    }
+
+    /**
+     * Public setter that can be used by direct users of FS or Visor.
+     *
+     * @param colocateFileWrites Whether all ongoing file writes should be colocated.
+     */
+    @SuppressWarnings("UnusedDeclaration")
+    public void colocateFileWrites(boolean colocateFileWrites) {
+        this.colocateFileWrites = colocateFileWrites;
+    }
+
+    /** {@inheritDoc} */
+    @SuppressWarnings("ConstantConditions")
+    @Override public void initialize(URI name, Configuration cfg) throws IOException {
+        enterBusy();
+
+        try {
+            if (rmtClient != null)
+                throw new IOException("File system is already initialized: " + rmtClient);
+
+            A.notNull(name, "name");
+            A.notNull(cfg, "cfg");
+
+            super.initialize(name, cfg);
+
+            setConf(cfg);
+
+            String disableCacheName = String.format("fs.%s.impl.disable.cache", name.getScheme());
+
+            cacheEnabled = !cfg.getBoolean(disableCacheName, false);
+
+            mgmt = cfg.getBoolean(IGFS_MANAGEMENT, false);
+
+            if (!IGFS_SCHEME.equals(name.getScheme()))
+                throw new IOException("Illegal file system URI [expected=" + IGFS_SCHEME +
+                    "://[name]/[optional_path], actual=" + name + ']');
+
+            uri = name;
+
+            uriAuthority = uri.getAuthority();
+
+            setUser(cfg.get(MRJobConfig.USER_NAME, DFLT_USER_NAME));
+
+            // Override sequential reads before prefetch if needed.
+            seqReadsBeforePrefetch = parameter(cfg, PARAM_IGFS_SEQ_READS_BEFORE_PREFETCH, uriAuthority, 0);
+
+            if (seqReadsBeforePrefetch > 0)
+                seqReadsBeforePrefetchOverride = true;
+
+            // In Ignite replication factor is controlled by data cache affinity.
+            // We use replication factor to force the whole file to be stored on local node.
+            dfltReplication = (short)cfg.getInt("dfs.replication", 3);
+
+            // Get file colocation control flag.
+            colocateFileWrites = parameter(cfg, PARAM_IGFS_COLOCATED_WRITES, uriAuthority, false);
+            preferLocFileWrites = cfg.getBoolean(PARAM_IGFS_PREFER_LOCAL_WRITES, false);
+
+            // Get log directory.
+            String logDirCfg = parameter(cfg, PARAM_IGFS_LOG_DIR, uriAuthority, DFLT_IGFS_LOG_DIR);
+
+            File logDirFile = U.resolveIgnitePath(logDirCfg);
+
+            String logDir = logDirFile != null ? logDirFile.getAbsolutePath() : null;
+
+            rmtClient = new HadoopIgfsWrapper(uriAuthority, logDir, cfg, LOG);
+
+            // Handshake.
+            IgfsHandshakeResponse handshake = rmtClient.handshake(logDir);
+
+            igfsGrpBlockSize = handshake.blockSize();
+
+            IgfsPaths paths = handshake.secondaryPaths();
+
+            // Initialize client logger.
+            Boolean logEnabled = parameter(cfg, PARAM_IGFS_LOG_ENABLED, uriAuthority, false);
+
+            if (handshake.sampling() != null ? handshake.sampling() : logEnabled) {
+                // Initiate client logger.
+                if (logDir == null)
+                    throw new IOException("Failed to resolve log directory: " + logDirCfg);
+
+                Integer batchSize = parameter(cfg, PARAM_IGFS_LOG_BATCH_SIZE, uriAuthority, DFLT_IGFS_LOG_BATCH_SIZE);
+
+                clientLog = IgfsLogger.logger(uriAuthority, handshake.igfsName(), logDir, batchSize);
+            }
+            else
+                clientLog = IgfsLogger.disabledLogger();
+
+            modeRslvr = new IgfsModeResolver(paths.defaultMode(), paths.pathModes());
+
+            boolean initSecondary = paths.defaultMode() == PROXY;
+
+            if (!initSecondary && paths.pathModes() != null && !paths.pathModes().isEmpty()) {
+                for (T2<IgfsPath, IgfsMode> pathMode : paths.pathModes()) {
+                    IgfsMode mode = pathMode.getValue();
+
+                    if (mode == PROXY) {
+                        initSecondary = true;
+
+                        break;
+                    }
+                }
+            }
+
+            if (initSecondary) {
+                Map<String, String> props = paths.properties();
+
+                String secUri = props.get(SECONDARY_FS_URI);
+                String secConfPath = props.get(SECONDARY_FS_CONFIG_PATH);
+
+                try {
+                    SecondaryFileSystemProvider secProvider = new SecondaryFileSystemProvider(secUri, secConfPath);
+
+                    secondaryFs = secProvider.createFileSystem();
+                    secondaryUri = secProvider.uri();
+                }
+                catch (IOException e) {
+                    if (!mgmt)
+                        throw new IOException("Failed to connect to the secondary file system: " + secUri, e);
+                    else
+                        LOG.warn("Visor failed to create secondary file system (operations on paths with PROXY mode " +
+                            "will have no effect): " + e.getMessage());
+                }
+            }
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override protected void checkPath(Path path) {
+        URI uri = path.toUri();
+
+        if (uri.isAbsolute()) {
+            if (!F.eq(uri.getScheme(), IGFS_SCHEME))
+                throw new InvalidPathException("Wrong path scheme [expected=" + IGFS_SCHEME + ", actual=" +
+                    uri.getAuthority() + ']');
+
+            if (!F.eq(uri.getAuthority(), uriAuthority))
+                throw new InvalidPathException("Wrong path authority [expected=" + uriAuthority + ", actual=" +
+                    uri.getAuthority() + ']');
+        }
+    }
+
+    /** {@inheritDoc} */
+    @SuppressWarnings("deprecation")
+    @Override public short getDefaultReplication() {
+        return dfltReplication;
+    }
+
+    /** {@inheritDoc} */
+    @Override protected void finalize() throws Throwable {
+        super.finalize();
+
+        close0();
+    }
+
+    /** {@inheritDoc} */
+    @Override public void close() throws IOException {
+        if (cacheEnabled && get(getUri(), getConf()) == this)
+            return;
+
+        close0();
+    }
+
+    /**
+     * Closes file system.
+     *
+     * @throws IOException If failed.
+     */
+    private void close0() throws IOException {
+        if (closeGuard.compareAndSet(false, true)) {
+            if (LOG.isDebugEnabled())
+                LOG.debug("File system closed [uri=" + uri + ", endpoint=" + uriAuthority + ']');
+
+            if (rmtClient == null)
+                return;
+
+            super.close();
+
+            rmtClient.close(false);
+
+            if (clientLog.isLogEnabled())
+                clientLog.close();
+
+            if (secondaryFs != null)
+                U.closeQuiet(secondaryFs);
+
+            // Reset initialized resources.
+            uri = null;
+            rmtClient = null;
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public void setTimes(Path p, long mtime, long atime) throws IOException {
+        enterBusy();
+
+        try {
+            A.notNull(p, "p");
+
+            if (mode(p) == PROXY) {
+                if (secondaryFs == null) {
+                    assert mgmt;
+
+                    // No-op for management connection.
+                    return;
+                }
+
+                secondaryFs.setTimes(toSecondary(p), mtime, atime);
+            }
+            else {
+                IgfsPath path = convert(p);
+
+                rmtClient.setTimes(path, atime, mtime);
+            }
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public void setPermission(Path p, FsPermission perm) throws IOException {
+        enterBusy();
+
+        try {
+            A.notNull(p, "p");
+
+            if (mode(p) == PROXY) {
+                if (secondaryFs == null) {
+                    assert mgmt;
+
+                    // No-op for management connection.
+                    return;
+                }
+
+                secondaryFs.setPermission(toSecondary(p), perm);
+            }
+            else if (rmtClient.update(convert(p), permission(perm)) == null) {
+                throw new IOException("Failed to set file permission (file not found?)" +
+                    " [path=" + p + ", perm=" + perm + ']');
+            }
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public void setOwner(Path p, String username, String grpName) throws IOException {
+        A.notNull(p, "p");
+        A.notNull(username, "username");
+        A.notNull(grpName, "grpName");
+
+        enterBusy();
+
+        try {
+            if (mode(p) == PROXY) {
+                if (secondaryFs == null) {
+                    assert mgmt;
+
+                    // No-op for management connection.
+                    return;
+                }
+
+                secondaryFs.setOwner(toSecondary(p), username, grpName);
+            }
+            else if (rmtClient.update(convert(p), F.asMap(PROP_USER_NAME, username, PROP_GROUP_NAME, grpName)) == null)
+                throw new IOException("Failed to set file permission (file not found?)" +
+                    " [path=" + p + ", userName=" + username + ", groupName=" + grpName + ']');
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public FSDataInputStream open(Path f, int bufSize) throws IOException {
+        A.notNull(f, "f");
+
+        enterBusy();
+
+        try {
+            IgfsPath path = convert(f);
+            IgfsMode mode = mode(path);
+
+            if (mode == PROXY) {
+                if (secondaryFs == null) {
+                    assert mgmt;
+
+                    throw new IOException("Failed to open file (secondary file system is not initialized): " + f);
+                }
+
+                FSDataInputStream is = secondaryFs.open(toSecondary(f), bufSize);
+
+                if (clientLog.isLogEnabled()) {
+                    // At this point we do not know file size, so we perform additional request to remote FS to get it.
+                    FileStatus status = secondaryFs.getFileStatus(toSecondary(f));
+
+                    long size = status != null ? status.getLen() : -1;
+
+                    long logId = IgfsLogger.nextId();
+
+                    clientLog.logOpen(logId, path, PROXY, bufSize, size);
+
+                    return new FSDataInputStream(new HadoopIgfsProxyInputStream(is, clientLog, logId));
+                }
+                else
+                    return is;
+            }
+            else {
+                HadoopIgfsStreamDelegate stream = seqReadsBeforePrefetchOverride ?
+                    rmtClient.open(path, seqReadsBeforePrefetch) : rmtClient.open(path);
+
+                long logId = -1;
+
+                if (clientLog.isLogEnabled()) {
+                    logId = IgfsLogger.nextId();
+
+                    clientLog.logOpen(logId, path, mode, bufSize, stream.length());
+                }
+
+                if (LOG.isDebugEnabled())
+                    LOG.debug("Opening input stream [thread=" + Thread.currentThread().getName() + ", path=" + path +
+                        ", bufSize=" + bufSize + ']');
+
+                HadoopIgfsInputStream igfsIn = new HadoopIgfsInputStream(stream, stream.length(),
+                    bufSize, LOG, clientLog, logId);
+
+                if (LOG.isDebugEnabled())
+                    LOG.debug("Opened input stream [path=" + path + ", delegate=" + stream + ']');
+
+                return new FSDataInputStream(igfsIn);
+            }
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @SuppressWarnings("deprecation")
+    @Override public FSDataOutputStream create(Path f, FsPermission perm, boolean overwrite, int bufSize,
+        short replication, long blockSize, Progressable progress) throws IOException {
+        A.notNull(f, "f");
+
+        enterBusy();
+
+        OutputStream out = null;
+
+        try {
+            IgfsPath path = convert(f);
+            IgfsMode mode = mode(path);
+
+            if (LOG.isDebugEnabled())
+                LOG.debug("Opening output stream in create [thread=" + Thread.currentThread().getName() + "path=" +
+                    path + ", overwrite=" + overwrite + ", bufSize=" + bufSize + ']');
+
+            if (mode == PROXY) {
+                if (secondaryFs == null) {
+                    assert mgmt;
+
+                    throw new IOException("Failed to create file (secondary file system is not initialized): " + f);
+                }
+
+                FSDataOutputStream os =
+                    secondaryFs.create(toSecondary(f), perm, overwrite, bufSize, replication, blockSize, progress);
+
+                if (clientLog.isLogEnabled()) {
+                    long logId = IgfsLogger.nextId();
+
+                    clientLog.logCreate(logId, path, PROXY, overwrite, bufSize, replication, blockSize);
+
+                    return new FSDataOutputStream(new HadoopIgfsProxyOutputStream(os, clientLog, logId));
+                }
+                else
+                    return os;
+            }
+            else {
+                // Create stream and close it in the 'finally' section if any sequential operation failed.
+                HadoopIgfsStreamDelegate stream = rmtClient.create(path, overwrite, colocateFileWrites,
+                    replication, blockSize, F.asMap(PROP_PERMISSION, toString(perm),
+                    PROP_PREFER_LOCAL_WRITES, Boolean.toString(preferLocFileWrites)));
+
+                assert stream != null;
+
+                long logId = -1;
+
+                if (clientLog.isLogEnabled()) {
+                    logId = IgfsLogger.nextId();
+
+                    clientLog.logCreate(logId, path, mode, overwrite, bufSize, replication, blockSize);
+                }
+
+                if (LOG.isDebugEnabled())
+                    LOG.debug("Opened output stream in create [path=" + path + ", delegate=" + stream + ']');
+
+                HadoopIgfsOutputStream igfsOut = new HadoopIgfsOutputStream(stream, LOG, clientLog,
+                    logId);
+
+                bufSize = Math.max(64 * 1024, bufSize);
+
+                out = new BufferedOutputStream(igfsOut, bufSize);
+
+                FSDataOutputStream res = new FSDataOutputStream(out, null, 0);
+
+                // Mark stream created successfully.
+                out = null;
+
+                return res;
+            }
+        }
+        finally {
+            // Close if failed during stream creation.
+            if (out != null)
+                U.closeQuiet(out);
+
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @SuppressWarnings("deprecation")
+    @Override public FSDataOutputStream append(Path f, int bufSize, Progressable progress) throws IOException {
+        A.notNull(f, "f");
+
+        enterBusy();
+
+        try {
+            IgfsPath path = convert(f);
+            IgfsMode mode = mode(path);
+
+            if (LOG.isDebugEnabled())
+                LOG.debug("Opening output stream in append [thread=" + Thread.currentThread().getName() +
+                    ", path=" + path + ", bufSize=" + bufSize + ']');
+
+            if (mode == PROXY) {
+                if (secondaryFs == null) {
+                    assert mgmt;
+
+                    throw new IOException("Failed to append file (secondary file system is not initialized): " + f);
+                }
+
+                FSDataOutputStream os = secondaryFs.append(toSecondary(f), bufSize, progress);
+
+                if (clientLog.isLogEnabled()) {
+                    long logId = IgfsLogger.nextId();
+
+                    clientLog.logAppend(logId, path, PROXY, bufSize); // Don't have stream ID.
+
+                    return new FSDataOutputStream(new HadoopIgfsProxyOutputStream(os, clientLog, logId));
+                }
+                else
+                    return os;
+            }
+            else {
+                HadoopIgfsStreamDelegate stream = rmtClient.append(path, false, null);
+
+                assert stream != null;
+
+                long logId = -1;
+
+                if (clientLog.isLogEnabled()) {
+                    logId = IgfsLogger.nextId();
+
+                    clientLog.logAppend(logId, path, mode, bufSize);
+                }
+
+                if (LOG.isDebugEnabled())
+                    LOG.debug("Opened output stream in append [path=" + path + ", delegate=" + stream + ']');
+
+                HadoopIgfsOutputStream igfsOut = new HadoopIgfsOutputStream(stream, LOG, clientLog,
+                    logId);
+
+                bufSize = Math.max(64 * 1024, bufSize);
+
+                BufferedOutputStream out = new BufferedOutputStream(igfsOut, bufSize);
+
+                return new FSDataOutputStream(out, null, 0);
+            }
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @SuppressWarnings("unchecked")
+    @Override public boolean rename(Path src, Path dst) throws IOException {
+        A.notNull(src, "src");
+        A.notNull(dst, "dst");
+
+        enterBusy();
+
+        try {
+            IgfsPath srcPath = convert(src);
+            IgfsPath dstPath = convert(dst);
+            IgfsMode mode = mode(srcPath);
+
+            if (mode == PROXY) {
+                if (secondaryFs == null) {
+                    assert mgmt;
+
+                    return false;
+                }
+
+                if (clientLog.isLogEnabled())
+                    clientLog.logRename(srcPath, PROXY, dstPath);
+
+                return secondaryFs.rename(toSecondary(src), toSecondary(dst));
+            }
+            else {
+                // Will throw exception if failed.
+                rmtClient.rename(srcPath, dstPath);
+
+                if (clientLog.isLogEnabled())
+                    clientLog.logRename(srcPath, mode, dstPath);
+
+                return true;
+            }
+        }
+        catch (IOException e) {
+            // Intentionally ignore IGFS exceptions here to follow Hadoop contract.
+            if (F.eq(IOException.class, e.getClass()) && (e.getCause() == null ||
+                !X.hasCause(e.getCause(), IgfsException.class)))
+                throw e;
+            else
+                return false;
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @SuppressWarnings("deprecation")
+    @Override public boolean delete(Path f) throws IOException {
+        return delete(f, false);
+    }
+
+    /** {@inheritDoc} */
+    @SuppressWarnings("unchecked")
+    @Override public boolean delete(Path f, boolean recursive) throws IOException {
+        A.notNull(f, "f");
+
+        enterBusy();
+
+        try {
+            IgfsPath path = convert(f);
+            IgfsMode mode = mode(path);
+
+            if (mode == PROXY) {
+                if (secondaryFs == null) {
+                    assert mgmt;
+
+                    return false;
+                }
+
+                if (clientLog.isLogEnabled())
+                    clientLog.logDelete(path, PROXY, recursive);
+
+                return secondaryFs.delete(toSecondary(f), recursive);
+            }
+            else {
+                // Will throw exception if delete failed.
+                boolean res = rmtClient.delete(path, recursive);
+
+                if (clientLog.isLogEnabled())
+                    clientLog.logDelete(path, mode, recursive);
+
+                return res;
+            }
+        }
+        catch (IOException e) {
+            // Intentionally ignore IGFS exceptions here to follow Hadoop contract.
+            if (F.eq(IOException.class, e.getClass()) && (e.getCause() == null ||
+                !X.hasCause(e.getCause(), IgfsException.class)))
+                throw e;
+            else
+                return false;
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public FileStatus[] listStatus(Path f) throws IOException {
+        A.notNull(f, "f");
+
+        enterBusy();
+
+        try {
+            IgfsPath path = convert(f);
+            IgfsMode mode = mode(path);
+
+            if (mode == PROXY) {
+                if (secondaryFs == null) {
+                    assert mgmt;
+
+                    return EMPTY_FILE_STATUS;
+                }
+
+                FileStatus[] arr = secondaryFs.listStatus(toSecondary(f));
+
+                if (arr == null)
+                    throw new FileNotFoundException("File " + f + " does not exist.");
+
+                for (int i = 0; i < arr.length; i++)
+                    arr[i] = toPrimary(arr[i]);
+
+                if (clientLog.isLogEnabled()) {
+                    String[] fileArr = new String[arr.length];
+
+                    for (int i = 0; i < arr.length; i++)
+                        fileArr[i] = arr[i].getPath().toString();
+
+                    clientLog.logListDirectory(path, PROXY, fileArr);
+                }
+
+                return arr;
+            }
+            else {
+                Collection<IgfsFile> list = rmtClient.listFiles(path);
+
+                if (list == null)
+                    throw new FileNotFoundException("File " + f + " does not exist.");
+
+                List<IgfsFile> files = new ArrayList<>(list);
+
+                FileStatus[] arr = new FileStatus[files.size()];
+
+                for (int i = 0; i < arr.length; i++)
+                    arr[i] = convert(files.get(i));
+
+                if (clientLog.isLogEnabled()) {
+                    String[] fileArr = new String[arr.length];
+
+                    for (int i = 0; i < arr.length; i++)
+                        fileArr[i] = arr[i].getPath().toString();
+
+                    clientLog.logListDirectory(path, mode, fileArr);
+                }
+
+                return arr;
+            }
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public Path getHomeDirectory() {
+        Path path = new Path("/user/" + userName.get());
+
+        return path.makeQualified(getUri(), null);
+    }
+
+    /**
+     * Set user name and default working directory for current thread.
+     *
+     * @param userName User name.
+     */
+    public void setUser(String userName) {
+        this.userName.set(userName);
+
+        setWorkingDirectory(null);
+    }
+
+    /** {@inheritDoc} */
+    @Override public void setWorkingDirectory(Path newPath) {
+        if (newPath == null) {
+            Path homeDir = getHomeDirectory();
+
+            if (secondaryFs != null)
+                secondaryFs.setWorkingDirectory(toSecondary(homeDir));
+
+            workingDir.set(homeDir);
+        }
+        else {
+            Path fixedNewPath = fixRelativePart(newPath);
+
+            String res = fixedNewPath.toUri().getPath();
+
+            if (!DFSUtil.isValidName(res))
+                throw new IllegalArgumentException("Invalid DFS directory name " + res);
+
+            if (secondaryFs != null)
+                secondaryFs.setWorkingDirectory(toSecondary(fixedNewPath));
+
+            workingDir.set(fixedNewPath);
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public Path getWorkingDirectory() {
+        return workingDir.get();
+    }
+
+    /** {@inheritDoc} */
+    @SuppressWarnings("unchecked")
+    @Override public boolean mkdirs(Path f, FsPermission perm) throws IOException {
+        A.notNull(f, "f");
+
+        enterBusy();
+
+        try {
+            IgfsPath path = convert(f);
+            IgfsMode mode = mode(path);
+
+            if (mode == PROXY) {
+                if (secondaryFs == null) {
+                    assert mgmt;
+
+                    return false;
+                }
+
+                if (clientLog.isLogEnabled())
+                    clientLog.logMakeDirectory(path, PROXY);
+
+                return secondaryFs.mkdirs(toSecondary(f), perm);
+            }
+            else {
+                boolean mkdirRes = rmtClient.mkdirs(path, permission(perm));
+
+                if (clientLog.isLogEnabled())
+                    clientLog.logMakeDirectory(path, mode);
+
+                return mkdirRes;
+            }
+        }
+        catch (IOException e) {
+            // Intentionally ignore IGFS exceptions here to follow Hadoop contract.
+            if (F.eq(IOException.class, e.getClass()) && (e.getCause() == null ||
+                !X.hasCause(e.getCause(), IgfsException.class)))
+                throw e;
+            else
+                return false;
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public FileStatus getFileStatus(Path f) throws IOException {
+        A.notNull(f, "f");
+
+        enterBusy();
+
+        try {
+            if (mode(f) == PROXY) {
+                if (secondaryFs == null) {
+                    assert mgmt;
+
+                    throw new IOException("Failed to get file status (secondary file system is not initialized): " + f);
+                }
+
+                return toPrimary(secondaryFs.getFileStatus(toSecondary(f)));
+            }
+            else {
+                IgfsFile info = rmtClient.info(convert(f));
+
+                if (info == null)
+                    throw new FileNotFoundException("File not found: " + f);
+
+                return convert(info);
+            }
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public ContentSummary getContentSummary(Path f) throws IOException {
+        A.notNull(f, "f");
+
+        enterBusy();
+
+        try {
+            if (mode(f) == PROXY) {
+                if (secondaryFs == null) {
+                    assert mgmt;
+
+                    throw new IOException("Failed to get content summary (secondary file system is not initialized): " +
+                        f);
+                }
+
+                return secondaryFs.getContentSummary(toSecondary(f));
+            }
+            else {
+                IgfsPathSummary sum = rmtClient.contentSummary(convert(f));
+
+                return new ContentSummary(sum.totalLength(), sum.filesCount(), sum.directoriesCount(),
+                    -1, sum.totalLength(), rmtClient.fsStatus().spaceTotal());
+            }
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public BlockLocation[] getFileBlockLocations(FileStatus status, long start, long len) throws IOException {
+        A.notNull(status, "status");
+
+        enterBusy();
+
+        try {
+            IgfsPath path = convert(status.getPath());
+
+            if (mode(status.getPath()) == PROXY) {
+                if (secondaryFs == null) {
+                    assert mgmt;
+
+                    return EMPTY_BLOCK_LOCATIONS;
+                }
+
+                Path secPath = toSecondary(status.getPath());
+
+                return secondaryFs.getFileBlockLocations(secondaryFs.getFileStatus(secPath), start, len);
+            }
+            else {
+                long now = System.currentTimeMillis();
+
+                List<IgfsBlockLocation> affinity = new ArrayList<>(rmtClient.affinity(path, start, len));
+
+                BlockLocation[] arr = new BlockLocation[affinity.size()];
+
+                for (int i = 0; i < arr.length; i++)
+                    arr[i] = convert(affinity.get(i));
+
+                if (LOG.isDebugEnabled())
+                    LOG.debug("Fetched file locations [path=" + path + ", fetchTime=" +
+                        (System.currentTimeMillis() - now) + ", locations=" + Arrays.asList(arr) + ']');
+
+                return arr;
+            }
+        }
+        catch (FileNotFoundException ignored) {
+            return EMPTY_BLOCK_LOCATIONS;
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @SuppressWarnings("deprecation")
+    @Override public long getDefaultBlockSize() {
+        return igfsGrpBlockSize;
+    }
+
+    /**
+     * Resolve path mode.
+     *
+     * @param path HDFS path.
+     * @return Path mode.
+     */
+    public IgfsMode mode(Path path) {
+        return mode(convert(path));
+    }
+
+    /**
+     * Resolve path mode.
+     *
+     * @param path IGFS path.
+     * @return Path mode.
+     */
+    public IgfsMode mode(IgfsPath path) {
+        return modeRslvr.resolveMode(path);
+    }
+
+    /**
+     * Convert the given path to path acceptable by the primary file system.
+     *
+     * @param path Path.
+     * @return Primary file system path.
+     */
+    private Path toPrimary(Path path) {
+        return convertPath(path, uri);
+    }
+
+    /**
+     * Convert the given path to path acceptable by the secondary file system.
+     *
+     * @param path Path.
+     * @return Secondary file system path.
+     */
+    private Path toSecondary(Path path) {
+        assert secondaryFs != null;
+        assert secondaryUri != null;
+
+        return convertPath(path, secondaryUri);
+    }
+
+    /**
+     * Convert path using the given new URI.
+     *
+     * @param path Old path.
+     * @param newUri New URI.
+     * @return New path.
+     */
+    private Path convertPath(Path path, URI newUri) {
+        assert newUri != null;
+
+        if (path != null) {
+            URI pathUri = path.toUri();
+
+            try {
+                return new Path(new URI(pathUri.getScheme() != null ? newUri.getScheme() : null,
+                    pathUri.getAuthority() != null ? newUri.getAuthority() : null, pathUri.getPath(), null, null));
+            }
+            catch (URISyntaxException e) {
+                throw new IgniteException("Failed to construct secondary file system path from the primary file " +
+                    "system path: " + path, e);
+            }
+        }
+        else
+            return null;
+    }
+
+    /**
+     * Convert a file status obtained from the secondary file system to a status of the primary file system.
+     *
+     * @param status Secondary file system status.
+     * @return Primary file system status.
+     */
+    @SuppressWarnings("deprecation")
+    private FileStatus toPrimary(FileStatus status) {
+        return status != null ? new FileStatus(status.getLen(), status.isDir(), status.getReplication(),
+            status.getBlockSize(), status.getModificationTime(), status.getAccessTime(), status.getPermission(),
+            status.getOwner(), status.getGroup(), toPrimary(status.getPath())) : null;
+    }
+
+    /**
+     * Convert IGFS path into Hadoop path.
+     *
+     * @param path IGFS path.
+     * @return Hadoop path.
+     */
+    private Path convert(IgfsPath path) {
+        return new Path(IGFS_SCHEME, uriAuthority, path.toString());
+    }
+
+    /**
+     * Convert Hadoop path into IGFS path.
+     *
+     * @param path Hadoop path.
+     * @return IGFS path.
+     */
+    @Nullable private IgfsPath convert(@Nullable Path path) {
+        if (path == null)
+            return null;
+
+        return path.isAbsolute() ? new IgfsPath(path.toUri().getPath()) :
+            new IgfsPath(convert(workingDir.get()), path.toUri().getPath());
+    }
+
+    /**
+     * Convert IGFS affinity block location into Hadoop affinity block location.
+     *
+     * @param block IGFS affinity block location.
+     * @return Hadoop affinity block location.
+     */
+    private BlockLocation convert(IgfsBlockLocation block) {
+        Collection<String> names = block.names();
+        Collection<String> hosts = block.hosts();
+
+        return new BlockLocation(
+            names.toArray(new String[names.size()]) /* hostname:portNumber of data nodes */,
+            hosts.toArray(new String[hosts.size()]) /* hostnames of data nodes */,
+            block.start(), block.length()
+        ) {
+            @Override public String toString() {
+                try {
+                    return "BlockLocation [offset=" + getOffset() + ", length=" + getLength() +
+                        ", hosts=" + Arrays.asList(getHosts()) + ", names=" + Arrays.asList(getNames()) + ']';
+                }
+                catch (IOException e) {
+                    throw new RuntimeException(e);
+                }
+            }
+        };
+    }
+
+    /**
+     * Convert IGFS file information into Hadoop file status.
+     *
+     * @param file IGFS file information.
+     * @return Hadoop file status.
+     */
+    @SuppressWarnings("deprecation")
+    private FileStatus convert(IgfsFile file) {
+        return new FileStatus(file.length(), file.isDirectory(), getDefaultReplication(),
+            file.groupBlockSize(), file.modificationTime(), file.accessTime(), permission(file),
+            file.property(PROP_USER_NAME, DFLT_USER_NAME), file.property(PROP_GROUP_NAME, "users"),
+            convert(file.path())) {
+            @Override public String toString() {
+                return "FileStatus [path=" + getPath() + ", isDir=" + isDir() + ", len=" + getLen() +
+                    ", mtime=" + getModificationTime() + ", atime=" + getAccessTime() + ']';
+            }
+        };
+    }
+
+    /**
+     * Convert Hadoop permission into IGFS file attribute.
+     *
+     * @param perm Hadoop permission.
+     * @return IGFS attributes.
+     */
+    private Map<String, String> permission(FsPermission perm) {
+        if (perm == null)
+            perm = FsPermission.getDefault();
+
+        return F.asMap(PROP_PERMISSION, toString(perm));
+    }
+
+    /**
+     * @param perm Permission.
+     * @return String.
+     */
+    private static String toString(FsPermission perm) {
+        return String.format("%04o", perm.toShort());
+    }
+
+    /**
+     * Convert IGFS file attributes into Hadoop permission.
+     *
+     * @param file File info.
+     * @return Hadoop permission.
+     */
+    private FsPermission permission(IgfsFile file) {
+        String perm = file.property(PROP_PERMISSION, null);
+
+        if (perm == null)
+            return FsPermission.getDefault();
+
+        try {
+            return new FsPermission((short)Integer.parseInt(perm, 8));
+        }
+        catch (NumberFormatException ignore) {
+            return FsPermission.getDefault();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public String toString() {
+        return S.toString(IgniteHadoopFileSystem.class, this);
+    }
+}

http://git-wip-us.apache.org/repos/asf/incubator-ignite/blob/6423cf02/modules/hadoop/src/main/java/org/apache/ignite/hadoop/fs/v1/package.html
----------------------------------------------------------------------
diff --git a/modules/hadoop/src/main/java/org/apache/ignite/hadoop/fs/v1/package.html b/modules/hadoop/src/main/java/org/apache/ignite/hadoop/fs/v1/package.html
new file mode 100644
index 0000000..69801af
--- /dev/null
+++ b/modules/hadoop/src/main/java/org/apache/ignite/hadoop/fs/v1/package.html
@@ -0,0 +1,24 @@
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<body>
+    <!-- Package description. -->
+    Contains Ignite Hadoop 1.x <code>FileSystem</code> implementation.
+</body>
+</html>

http://git-wip-us.apache.org/repos/asf/incubator-ignite/blob/6423cf02/modules/hadoop/src/main/java/org/apache/ignite/hadoop/fs/v2/IgniteHadoopFileSystem.java
----------------------------------------------------------------------
diff --git a/modules/hadoop/src/main/java/org/apache/ignite/hadoop/fs/v2/IgniteHadoopFileSystem.java b/modules/hadoop/src/main/java/org/apache/ignite/hadoop/fs/v2/IgniteHadoopFileSystem.java
new file mode 100644
index 0000000..70ad99f
--- /dev/null
+++ b/modules/hadoop/src/main/java/org/apache/ignite/hadoop/fs/v2/IgniteHadoopFileSystem.java
@@ -0,0 +1,982 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.hadoop.fs.v2;
+
+import org.apache.commons.logging.*;
+import org.apache.hadoop.conf.*;
+import org.apache.hadoop.fs.*;
+import org.apache.hadoop.fs.Options;
+import org.apache.hadoop.fs.permission.*;
+import org.apache.hadoop.mapreduce.*;
+import org.apache.hadoop.util.*;
+import org.apache.ignite.*;
+import org.apache.ignite.igfs.*;
+import org.apache.ignite.internal.igfs.common.*;
+import org.apache.ignite.internal.processors.hadoop.*;
+import org.apache.ignite.internal.processors.hadoop.igfs.*;
+import org.apache.ignite.internal.processors.igfs.*;
+import org.apache.ignite.internal.util.typedef.*;
+import org.apache.ignite.internal.util.typedef.internal.*;
+import org.jetbrains.annotations.*;
+
+import java.io.*;
+import java.net.*;
+import java.util.*;
+import java.util.concurrent.atomic.*;
+
+import static org.apache.ignite.configuration.FileSystemConfiguration.*;
+import static org.apache.ignite.igfs.IgfsMode.*;
+import static org.apache.ignite.internal.processors.hadoop.fs.HadoopParameters.*;
+import static org.apache.ignite.internal.processors.hadoop.igfs.HadoopIgfsUtils.*;
+import static org.apache.ignite.internal.processors.igfs.IgfsEx.*;
+
+/**
+ * {@code IGFS} Hadoop 2.x file system driver over file system API. To use
+ * {@code IGFS} as Hadoop file system, you should configure this class
+ * in Hadoop's {@code core-site.xml} as follows:
+ * <pre name="code" class="xml">
+ *  &lt;property&gt;
+ *      &lt;name&gt;fs.default.name&lt;/name&gt;
+ *      &lt;value&gt;igfs://ipc&lt;/value&gt;
+ *  &lt;/property&gt;
+ *
+ *  &lt;property&gt;
+ *      &lt;name&gt;fs.igfs.impl&lt;/name&gt;
+ *      &lt;value&gt;org.apache.ignite.hadoop.fs.v2.IgniteHadoopFileSystem&lt;/value&gt;
+ *  &lt;/property&gt;
+ * </pre>
+ * You should also add Ignite JAR and all libraries to Hadoop classpath. To
+ * do this, add following lines to {@code conf/hadoop-env.sh} script in Hadoop
+ * distribution:
+ * <pre name="code" class="bash">
+ * export IGNITE_HOME=/path/to/Ignite/distribution
+ * export HADOOP_CLASSPATH=$IGNITE_HOME/ignite*.jar
+ *
+ * for f in $IGNITE_HOME/libs/*.jar; do
+ *  export HADOOP_CLASSPATH=$HADOOP_CLASSPATH:$f;
+ * done
+ * </pre>
+ * <h1 class="header">Data vs Clients Nodes</h1>
+ * Hadoop needs to use its FileSystem remotely from client nodes as well as directly on
+ * data nodes. Client nodes are responsible for basic file system operations as well as
+ * accessing data nodes remotely. Usually, client nodes are started together
+ * with {@code job-submitter} or {@code job-scheduler} processes, while data nodes are usually
+ * started together with Hadoop {@code task-tracker} processes.
+ * <p>
+ * For sample client and data node configuration refer to {@code config/hadoop/default-config-client.xml}
+ * and {@code config/hadoop/default-config.xml} configuration files in Ignite installation.
+ */
+public class IgniteHadoopFileSystem extends AbstractFileSystem implements Closeable {
+    /** Logger. */
+    private static final Log LOG = LogFactory.getLog(IgniteHadoopFileSystem.class);
+
+    /** Ensures that close routine is invoked at most once. */
+    private final AtomicBoolean closeGuard = new AtomicBoolean();
+
+    /** Grid remote client. */
+    private HadoopIgfsWrapper rmtClient;
+
+    /** Working directory. */
+    private IgfsPath workingDir;
+
+    /** URI. */
+    private URI uri;
+
+    /** Authority. */
+    private String uriAuthority;
+
+    /** Client logger. */
+    private IgfsLogger clientLog;
+
+    /** Server block size. */
+    private long grpBlockSize;
+
+    /** Default replication factor. */
+    private short dfltReplication;
+
+    /** Secondary URI string. */
+    private URI secondaryUri;
+
+    /** Mode resolver. */
+    private IgfsModeResolver modeRslvr;
+
+    /** Secondary file system instance. */
+    private AbstractFileSystem secondaryFs;
+
+    /** Whether custom sequential reads before prefetch value is provided. */
+    private boolean seqReadsBeforePrefetchOverride;
+
+    /** Custom-provided sequential reads before prefetch. */
+    private int seqReadsBeforePrefetch;
+
+    /** Flag that controls whether file writes should be colocated on data node. */
+    private boolean colocateFileWrites;
+
+    /** Prefer local writes. */
+    private boolean preferLocFileWrites;
+
+    /**
+     * @param name URI for file system.
+     * @param cfg Configuration.
+     * @throws URISyntaxException if name has invalid syntax.
+     * @throws IOException If initialization failed.
+     */
+    public IgniteHadoopFileSystem(URI name, Configuration cfg) throws URISyntaxException, IOException {
+        super(HadoopIgfsEndpoint.normalize(name), IGFS_SCHEME, false, -1);
+
+        uri = name;
+
+        try {
+            initialize(name, cfg);
+        }
+        catch (IOException e) {
+            // Close client if exception occurred.
+            if (rmtClient != null)
+                rmtClient.close(false);
+
+            throw e;
+        }
+
+        workingDir = new IgfsPath("/user/" + cfg.get(MRJobConfig.USER_NAME, DFLT_USER_NAME));
+    }
+
+    /** {@inheritDoc} */
+    @Override public void checkPath(Path path) {
+        URI uri = path.toUri();
+
+        if (uri.isAbsolute()) {
+            if (!F.eq(uri.getScheme(), IGFS_SCHEME))
+                throw new InvalidPathException("Wrong path scheme [expected=" + IGFS_SCHEME + ", actual=" +
+                    uri.getAuthority() + ']');
+
+            if (!F.eq(uri.getAuthority(), uriAuthority))
+                throw new InvalidPathException("Wrong path authority [expected=" + uriAuthority + ", actual=" +
+                    uri.getAuthority() + ']');
+        }
+    }
+
+    /**
+     * Public setter that can be used by direct users of FS or Visor.
+     *
+     * @param colocateFileWrites Whether all ongoing file writes should be colocated.
+     */
+    @SuppressWarnings("UnusedDeclaration")
+    public void colocateFileWrites(boolean colocateFileWrites) {
+        this.colocateFileWrites = colocateFileWrites;
+    }
+
+    /**
+     * Enter busy state.
+     *
+     * @throws IOException If file system is stopped.
+     */
+    private void enterBusy() throws IOException {
+        if (closeGuard.get())
+            throw new IOException("File system is stopped.");
+    }
+
+    /**
+     * Leave busy state.
+     */
+    private void leaveBusy() {
+        // No-op.
+    }
+
+    /**
+     * @param name URI passed to constructor.
+     * @param cfg Configuration passed to constructor.
+     * @throws IOException If initialization failed.
+     */
+    @SuppressWarnings("ConstantConditions")
+    private void initialize(URI name, Configuration cfg) throws IOException {
+        enterBusy();
+
+        try {
+            if (rmtClient != null)
+                throw new IOException("File system is already initialized: " + rmtClient);
+
+            A.notNull(name, "name");
+            A.notNull(cfg, "cfg");
+
+            if (!IGFS_SCHEME.equals(name.getScheme()))
+                throw new IOException("Illegal file system URI [expected=" + IGFS_SCHEME +
+                    "://[name]/[optional_path], actual=" + name + ']');
+
+            uriAuthority = name.getAuthority();
+
+            // Override sequential reads before prefetch if needed.
+            seqReadsBeforePrefetch = parameter(cfg, PARAM_IGFS_SEQ_READS_BEFORE_PREFETCH, uriAuthority, 0);
+
+            if (seqReadsBeforePrefetch > 0)
+                seqReadsBeforePrefetchOverride = true;
+
+            // In Ignite replication factor is controlled by data cache affinity.
+            // We use replication factor to force the whole file to be stored on local node.
+            dfltReplication = (short)cfg.getInt("dfs.replication", 3);
+
+            // Get file colocation control flag.
+            colocateFileWrites = parameter(cfg, PARAM_IGFS_COLOCATED_WRITES, uriAuthority, false);
+            preferLocFileWrites = cfg.getBoolean(PARAM_IGFS_PREFER_LOCAL_WRITES, false);
+
+            // Get log directory.
+            String logDirCfg = parameter(cfg, PARAM_IGFS_LOG_DIR, uriAuthority, DFLT_IGFS_LOG_DIR);
+
+            File logDirFile = U.resolveIgnitePath(logDirCfg);
+
+            String logDir = logDirFile != null ? logDirFile.getAbsolutePath() : null;
+
+            rmtClient = new HadoopIgfsWrapper(uriAuthority, logDir, cfg, LOG);
+
+            // Handshake.
+            IgfsHandshakeResponse handshake = rmtClient.handshake(logDir);
+
+            grpBlockSize = handshake.blockSize();
+
+            IgfsPaths paths = handshake.secondaryPaths();
+
+            Boolean logEnabled = parameter(cfg, PARAM_IGFS_LOG_ENABLED, uriAuthority, false);
+
+            if (handshake.sampling() != null ? handshake.sampling() : logEnabled) {
+                // Initiate client logger.
+                if (logDir == null)
+                    throw new IOException("Failed to resolve log directory: " + logDirCfg);
+
+                Integer batchSize = parameter(cfg, PARAM_IGFS_LOG_BATCH_SIZE, uriAuthority, DFLT_IGFS_LOG_BATCH_SIZE);
+
+                clientLog = IgfsLogger.logger(uriAuthority, handshake.igfsName(), logDir, batchSize);
+            }
+            else
+                clientLog = IgfsLogger.disabledLogger();
+
+            modeRslvr = new IgfsModeResolver(paths.defaultMode(), paths.pathModes());
+
+            boolean initSecondary = paths.defaultMode() == PROXY;
+
+            if (!initSecondary && paths.pathModes() != null) {
+                for (T2<IgfsPath, IgfsMode> pathMode : paths.pathModes()) {
+                    IgfsMode mode = pathMode.getValue();
+
+                    if (mode == PROXY) {
+                        initSecondary = true;
+
+                        break;
+                    }
+                }
+            }
+
+            if (initSecondary) {
+                Map<String, String> props = paths.properties();
+
+                String secUri = props.get(SECONDARY_FS_URI);
+                String secConfPath = props.get(SECONDARY_FS_CONFIG_PATH);
+
+                try {
+                    SecondaryFileSystemProvider secProvider = new SecondaryFileSystemProvider(secUri, secConfPath);
+
+                    secondaryFs = secProvider.createAbstractFileSystem();
+                    secondaryUri = secProvider.uri();
+                }
+                catch (IOException e) {
+                    throw new IOException("Failed to connect to the secondary file system: " + secUri, e);
+                }
+            }
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public void close() throws IOException {
+        if (closeGuard.compareAndSet(false, true)) {
+            if (rmtClient == null)
+                return;
+
+            rmtClient.close(false);
+
+            if (clientLog.isLogEnabled())
+                clientLog.close();
+
+            // Reset initialized resources.
+            rmtClient = null;
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public URI getUri() {
+        return uri;
+    }
+
+    /** {@inheritDoc} */
+    @Override public int getUriDefaultPort() {
+        return -1;
+    }
+
+    /** {@inheritDoc} */
+    @Override public FsServerDefaults getServerDefaults() throws IOException {
+        return new FsServerDefaults(grpBlockSize, (int)grpBlockSize, (int)grpBlockSize, dfltReplication, 64 * 1024,
+            false, 0, DataChecksum.Type.NULL);
+    }
+
+    /** {@inheritDoc} */
+    @Override public boolean setReplication(Path f, short replication) throws IOException {
+        return mode(f) == PROXY && secondaryFs.setReplication(f, replication);
+    }
+
+    /** {@inheritDoc} */
+    @Override public void setTimes(Path f, long mtime, long atime) throws IOException {
+        if (mode(f) == PROXY)
+            secondaryFs.setTimes(f, mtime, atime);
+        else {
+            if (mtime == -1 && atime == -1)
+                return;
+
+            rmtClient.setTimes(convert(f), atime, mtime);
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public FsStatus getFsStatus() throws IOException {
+        IgfsStatus status = rmtClient.fsStatus();
+
+        return new FsStatus(status.spaceTotal(), status.spaceUsed(), status.spaceTotal() - status.spaceUsed());
+    }
+
+    /** {@inheritDoc} */
+    @Override public void setPermission(Path p, FsPermission perm) throws IOException {
+        enterBusy();
+
+        try {
+            A.notNull(p, "p");
+
+            if (mode(p) == PROXY)
+                secondaryFs.setPermission(toSecondary(p), perm);
+            else {
+                if (rmtClient.update(convert(p), permission(perm)) == null)
+                    throw new IOException("Failed to set file permission (file not found?)" +
+                        " [path=" + p + ", perm=" + perm + ']');
+            }
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public void setOwner(Path p, String usr, String grp) throws IOException {
+        A.notNull(p, "p");
+        A.notNull(usr, "username");
+        A.notNull(grp, "grpName");
+
+        enterBusy();
+
+        try {
+            if (mode(p) == PROXY)
+                secondaryFs.setOwner(toSecondary(p), usr, grp);
+            else if (rmtClient.update(convert(p), F.asMap(PROP_USER_NAME, usr, PROP_GROUP_NAME, grp)) == null)
+                throw new IOException("Failed to set file permission (file not found?)" +
+                    " [path=" + p + ", username=" + usr + ", grpName=" + grp + ']');
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public FSDataInputStream open(Path f, int bufSize) throws IOException {
+        A.notNull(f, "f");
+
+        enterBusy();
+
+        try {
+            IgfsPath path = convert(f);
+            IgfsMode mode = modeRslvr.resolveMode(path);
+
+            if (mode == PROXY) {
+                FSDataInputStream is = secondaryFs.open(toSecondary(f), bufSize);
+
+                if (clientLog.isLogEnabled()) {
+                    // At this point we do not know file size, so we perform additional request to remote FS to get it.
+                    FileStatus status = secondaryFs.getFileStatus(toSecondary(f));
+
+                    long size = status != null ? status.getLen() : -1;
+
+                    long logId = IgfsLogger.nextId();
+
+                    clientLog.logOpen(logId, path, PROXY, bufSize, size);
+
+                    return new FSDataInputStream(new HadoopIgfsProxyInputStream(is, clientLog, logId));
+                }
+                else
+                    return is;
+            }
+            else {
+                HadoopIgfsStreamDelegate stream = seqReadsBeforePrefetchOverride ?
+                    rmtClient.open(path, seqReadsBeforePrefetch) : rmtClient.open(path);
+
+                long logId = -1;
+
+                if (clientLog.isLogEnabled()) {
+                    logId = IgfsLogger.nextId();
+
+                    clientLog.logOpen(logId, path, mode, bufSize, stream.length());
+                }
+
+                if (LOG.isDebugEnabled())
+                    LOG.debug("Opening input stream [thread=" + Thread.currentThread().getName() + ", path=" + path +
+                        ", bufSize=" + bufSize + ']');
+
+                HadoopIgfsInputStream igfsIn = new HadoopIgfsInputStream(stream, stream.length(),
+                    bufSize, LOG, clientLog, logId);
+
+                if (LOG.isDebugEnabled())
+                    LOG.debug("Opened input stream [path=" + path + ", delegate=" + stream + ']');
+
+                return new FSDataInputStream(igfsIn);
+            }
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @SuppressWarnings("deprecation")
+    @Override public FSDataOutputStream createInternal(
+        Path f,
+        EnumSet<CreateFlag> flag,
+        FsPermission perm,
+        int bufSize,
+        short replication,
+        long blockSize,
+        Progressable progress,
+        Options.ChecksumOpt checksumOpt,
+        boolean createParent
+    ) throws IOException {
+        A.notNull(f, "f");
+
+        enterBusy();
+
+        boolean overwrite = flag.contains(CreateFlag.OVERWRITE);
+        boolean append = flag.contains(CreateFlag.APPEND);
+        boolean create = flag.contains(CreateFlag.CREATE);
+
+        OutputStream out = null;
+
+        try {
+            IgfsPath path = convert(f);
+            IgfsMode mode = modeRslvr.resolveMode(path);
+
+            if (LOG.isDebugEnabled())
+                LOG.debug("Opening output stream in create [thread=" + Thread.currentThread().getName() + "path=" +
+                    path + ", overwrite=" + overwrite + ", bufSize=" + bufSize + ']');
+
+            if (mode == PROXY) {
+                FSDataOutputStream os = secondaryFs.createInternal(toSecondary(f), flag, perm, bufSize,
+                    replication, blockSize, progress, checksumOpt, createParent);
+
+                if (clientLog.isLogEnabled()) {
+                    long logId = IgfsLogger.nextId();
+
+                    if (append)
+                        clientLog.logAppend(logId, path, PROXY, bufSize); // Don't have stream ID.
+                    else
+                        clientLog.logCreate(logId, path, PROXY, overwrite, bufSize, replication, blockSize);
+
+                    return new FSDataOutputStream(new HadoopIgfsProxyOutputStream(os, clientLog, logId));
+                }
+                else
+                    return os;
+            }
+            else {
+                Map<String, String> permMap = F.asMap(PROP_PERMISSION, toString(perm),
+                    PROP_PREFER_LOCAL_WRITES, Boolean.toString(preferLocFileWrites));
+
+                // Create stream and close it in the 'finally' section if any sequential operation failed.
+                HadoopIgfsStreamDelegate stream;
+
+                long logId = -1;
+
+                if (append) {
+                    stream = rmtClient.append(path, create, permMap);
+
+                    if (clientLog.isLogEnabled()) {
+                        logId = IgfsLogger.nextId();
+
+                        clientLog.logAppend(logId, path, mode, bufSize);
+                    }
+
+                    if (LOG.isDebugEnabled())
+                        LOG.debug("Opened output stream in append [path=" + path + ", delegate=" + stream + ']');
+                }
+                else {
+                    stream = rmtClient.create(path, overwrite, colocateFileWrites, replication, blockSize,
+                        permMap);
+
+                    if (clientLog.isLogEnabled()) {
+                        logId = IgfsLogger.nextId();
+
+                        clientLog.logCreate(logId, path, mode, overwrite, bufSize, replication, blockSize);
+                    }
+
+                    if (LOG.isDebugEnabled())
+                        LOG.debug("Opened output stream in create [path=" + path + ", delegate=" + stream + ']');
+                }
+
+                assert stream != null;
+
+                HadoopIgfsOutputStream igfsOut = new HadoopIgfsOutputStream(stream, LOG,
+                    clientLog, logId);
+
+                bufSize = Math.max(64 * 1024, bufSize);
+
+                out = new BufferedOutputStream(igfsOut, bufSize);
+
+                FSDataOutputStream res = new FSDataOutputStream(out, null, 0);
+
+                // Mark stream created successfully.
+                out = null;
+
+                return res;
+            }
+        }
+        finally {
+            // Close if failed during stream creation.
+            if (out != null)
+                U.closeQuiet(out);
+
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public boolean supportsSymlinks() {
+        return false;
+    }
+
+    /** {@inheritDoc} */
+    @Override public void renameInternal(Path src, Path dst) throws IOException {
+        A.notNull(src, "src");
+        A.notNull(dst, "dst");
+
+        enterBusy();
+
+        try {
+            IgfsPath srcPath = convert(src);
+            IgfsPath dstPath = convert(dst);
+            Set<IgfsMode> childrenModes = modeRslvr.resolveChildrenModes(srcPath);
+
+            if (childrenModes.contains(PROXY)) {
+                if (clientLog.isLogEnabled())
+                    clientLog.logRename(srcPath, PROXY, dstPath);
+
+                secondaryFs.renameInternal(toSecondary(src), toSecondary(dst));
+            }
+
+            rmtClient.rename(srcPath, dstPath);
+
+            if (clientLog.isLogEnabled())
+                clientLog.logRename(srcPath, modeRslvr.resolveMode(srcPath), dstPath);
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public boolean delete(Path f, boolean recursive) throws IOException {
+        A.notNull(f, "f");
+
+        enterBusy();
+
+        try {
+            IgfsPath path = convert(f);
+            IgfsMode mode = modeRslvr.resolveMode(path);
+            Set<IgfsMode> childrenModes = modeRslvr.resolveChildrenModes(path);
+
+            if (childrenModes.contains(PROXY)) {
+                if (clientLog.isLogEnabled())
+                    clientLog.logDelete(path, PROXY, recursive);
+
+                return secondaryFs.delete(toSecondary(f), recursive);
+            }
+
+            boolean res = rmtClient.delete(path, recursive);
+
+            if (clientLog.isLogEnabled())
+                clientLog.logDelete(path, mode, recursive);
+
+            return res;
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public void setVerifyChecksum(boolean verifyChecksum) throws IOException {
+        // Checksum has effect for secondary FS only.
+        if (secondaryFs != null)
+            secondaryFs.setVerifyChecksum(verifyChecksum);
+    }
+
+    /** {@inheritDoc} */
+    @Override public FileChecksum getFileChecksum(Path f) throws IOException {
+        if (mode(f) == PROXY)
+            return secondaryFs.getFileChecksum(f);
+
+        return null;
+    }
+
+    /** {@inheritDoc} */
+    @Override public FileStatus[] listStatus(Path f) throws IOException {
+        A.notNull(f, "f");
+
+        enterBusy();
+
+        try {
+            IgfsPath path = convert(f);
+            IgfsMode mode = modeRslvr.resolveMode(path);
+
+            if (mode == PROXY) {
+                FileStatus[] arr = secondaryFs.listStatus(toSecondary(f));
+
+                if (arr == null)
+                    throw new FileNotFoundException("File " + f + " does not exist.");
+
+                for (int i = 0; i < arr.length; i++)
+                    arr[i] = toPrimary(arr[i]);
+
+                if (clientLog.isLogEnabled()) {
+                    String[] fileArr = new String[arr.length];
+
+                    for (int i = 0; i < arr.length; i++)
+                        fileArr[i] = arr[i].getPath().toString();
+
+                    clientLog.logListDirectory(path, PROXY, fileArr);
+                }
+
+                return arr;
+            }
+            else {
+                Collection<IgfsFile> list = rmtClient.listFiles(path);
+
+                if (list == null)
+                    throw new FileNotFoundException("File " + f + " does not exist.");
+
+                List<IgfsFile> files = new ArrayList<>(list);
+
+                FileStatus[] arr = new FileStatus[files.size()];
+
+                for (int i = 0; i < arr.length; i++)
+                    arr[i] = convert(files.get(i));
+
+                if (clientLog.isLogEnabled()) {
+                    String[] fileArr = new String[arr.length];
+
+                    for (int i = 0; i < arr.length; i++)
+                        fileArr[i] = arr[i].getPath().toString();
+
+                    clientLog.logListDirectory(path, mode, fileArr);
+                }
+
+                return arr;
+            }
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public void mkdir(Path f, FsPermission perm, boolean createParent) throws IOException {
+        A.notNull(f, "f");
+
+        enterBusy();
+
+        try {
+            IgfsPath path = convert(f);
+            IgfsMode mode = modeRslvr.resolveMode(path);
+
+            if (mode == PROXY) {
+                if (clientLog.isLogEnabled())
+                    clientLog.logMakeDirectory(path, PROXY);
+
+                secondaryFs.mkdir(toSecondary(f), perm, createParent);
+            }
+            else {
+                rmtClient.mkdirs(path, permission(perm));
+
+                if (clientLog.isLogEnabled())
+                    clientLog.logMakeDirectory(path, mode);
+            }
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public FileStatus getFileStatus(Path f) throws IOException {
+        A.notNull(f, "f");
+
+        enterBusy();
+
+        try {
+            if (mode(f) == PROXY)
+                return toPrimary(secondaryFs.getFileStatus(toSecondary(f)));
+            else {
+                IgfsFile info = rmtClient.info(convert(f));
+
+                if (info == null)
+                    throw new FileNotFoundException("File not found: " + f);
+
+                return convert(info);
+            }
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public BlockLocation[] getFileBlockLocations(Path path, long start, long len) throws IOException {
+        A.notNull(path, "path");
+
+        IgfsPath igfsPath = convert(path);
+
+        enterBusy();
+
+        try {
+            if (modeRslvr.resolveMode(igfsPath) == PROXY)
+                return secondaryFs.getFileBlockLocations(path, start, len);
+            else {
+                long now = System.currentTimeMillis();
+
+                List<IgfsBlockLocation> affinity = new ArrayList<>(
+                    rmtClient.affinity(igfsPath, start, len));
+
+                BlockLocation[] arr = new BlockLocation[affinity.size()];
+
+                for (int i = 0; i < arr.length; i++)
+                    arr[i] = convert(affinity.get(i));
+
+                if (LOG.isDebugEnabled())
+                    LOG.debug("Fetched file locations [path=" + path + ", fetchTime=" +
+                        (System.currentTimeMillis() - now) + ", locations=" + Arrays.asList(arr) + ']');
+
+                return arr;
+            }
+        }
+        finally {
+            leaveBusy();
+        }
+    }
+
+    /**
+     * Resolve path mode.
+     *
+     * @param path HDFS path.
+     * @return Path mode.
+     */
+    public IgfsMode mode(Path path) {
+        return modeRslvr.resolveMode(convert(path));
+    }
+
+    /**
+     * Convert the given path to path acceptable by the primary file system.
+     *
+     * @param path Path.
+     * @return Primary file system path.
+     */
+    private Path toPrimary(Path path) {
+        return convertPath(path, getUri());
+    }
+
+    /**
+     * Convert the given path to path acceptable by the secondary file system.
+     *
+     * @param path Path.
+     * @return Secondary file system path.
+     */
+    private Path toSecondary(Path path) {
+        assert secondaryFs != null;
+        assert secondaryUri != null;
+
+        return convertPath(path, secondaryUri);
+    }
+
+    /**
+     * Convert path using the given new URI.
+     *
+     * @param path Old path.
+     * @param newUri New URI.
+     * @return New path.
+     */
+    private Path convertPath(Path path, URI newUri) {
+        assert newUri != null;
+
+        if (path != null) {
+            URI pathUri = path.toUri();
+
+            try {
+                return new Path(new URI(pathUri.getScheme() != null ? newUri.getScheme() : null,
+                    pathUri.getAuthority() != null ? newUri.getAuthority() : null, pathUri.getPath(), null, null));
+            }
+            catch (URISyntaxException e) {
+                throw new IgniteException("Failed to construct secondary file system path from the primary file " +
+                    "system path: " + path, e);
+            }
+        }
+        else
+            return null;
+    }
+
+    /**
+     * Convert a file status obtained from the secondary file system to a status of the primary file system.
+     *
+     * @param status Secondary file system status.
+     * @return Primary file system status.
+     */
+    private FileStatus toPrimary(FileStatus status) {
+        return status != null ? new FileStatus(status.getLen(), status.isDirectory(), status.getReplication(),
+            status.getBlockSize(), status.getModificationTime(), status.getAccessTime(), status.getPermission(),
+            status.getOwner(), status.getGroup(), toPrimary(status.getPath())) : null;
+    }
+
+    /**
+     * Convert IGFS path into Hadoop path.
+     *
+     * @param path IGFS path.
+     * @return Hadoop path.
+     */
+    private Path convert(IgfsPath path) {
+        return new Path(IGFS_SCHEME, uriAuthority, path.toString());
+    }
+
+    /**
+     * Convert Hadoop path into IGFS path.
+     *
+     * @param path Hadoop path.
+     * @return IGFS path.
+     */
+    @Nullable private IgfsPath convert(Path path) {
+        if (path == null)
+            return null;
+
+        return path.isAbsolute() ? new IgfsPath(path.toUri().getPath()) :
+            new IgfsPath(workingDir, path.toUri().getPath());
+    }
+
+    /**
+     * Convert IGFS affinity block location into Hadoop affinity block location.
+     *
+     * @param block IGFS affinity block location.
+     * @return Hadoop affinity block location.
+     */
+    private BlockLocation convert(IgfsBlockLocation block) {
+        Collection<String> names = block.names();
+        Collection<String> hosts = block.hosts();
+
+        return new BlockLocation(
+            names.toArray(new String[names.size()]) /* hostname:portNumber of data nodes */,
+            hosts.toArray(new String[hosts.size()]) /* hostnames of data nodes */,
+            block.start(), block.length()
+        ) {
+            @Override public String toString() {
+                try {
+                    return "BlockLocation [offset=" + getOffset() + ", length=" + getLength() +
+                        ", hosts=" + Arrays.asList(getHosts()) + ", names=" + Arrays.asList(getNames()) + ']';
+                }
+                catch (IOException e) {
+                    throw new RuntimeException(e);
+                }
+            }
+        };
+    }
+
+    /**
+     * Convert IGFS file information into Hadoop file status.
+     *
+     * @param file IGFS file information.
+     * @return Hadoop file status.
+     */
+    private FileStatus convert(IgfsFile file) {
+        return new FileStatus(
+            file.length(),
+            file.isDirectory(),
+            dfltReplication,
+            file.groupBlockSize(),
+            file.modificationTime(),
+            file.accessTime(),
+            permission(file),
+            file.property(PROP_USER_NAME, DFLT_USER_NAME),
+            file.property(PROP_GROUP_NAME, "users"),
+            convert(file.path())) {
+            @Override public String toString() {
+                return "FileStatus [path=" + getPath() + ", isDir=" + isDirectory() + ", len=" + getLen() + "]";
+            }
+        };
+    }
+
+    /**
+     * Convert Hadoop permission into IGFS file attribute.
+     *
+     * @param perm Hadoop permission.
+     * @return IGFS attributes.
+     */
+    private Map<String, String> permission(FsPermission perm) {
+        if (perm == null)
+            perm = FsPermission.getDefault();
+
+        return F.asMap(PROP_PERMISSION, toString(perm));
+    }
+
+    /**
+     * @param perm Permission.
+     * @return String.
+     */
+    private static String toString(FsPermission perm) {
+        return String.format("%04o", perm.toShort());
+    }
+
+    /**
+     * Convert IGFS file attributes into Hadoop permission.
+     *
+     * @param file File info.
+     * @return Hadoop permission.
+     */
+    private FsPermission permission(IgfsFile file) {
+        String perm = file.property(PROP_PERMISSION, null);
+
+        if (perm == null)
+            return FsPermission.getDefault();
+
+        try {
+            return new FsPermission((short)Integer.parseInt(perm, 8));
+        }
+        catch (NumberFormatException ignore) {
+            return FsPermission.getDefault();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public String toString() {
+        return S.toString(IgniteHadoopFileSystem.class, this);
+    }
+}

http://git-wip-us.apache.org/repos/asf/incubator-ignite/blob/6423cf02/modules/hadoop/src/main/java/org/apache/ignite/hadoop/fs/v2/package.html
----------------------------------------------------------------------
diff --git a/modules/hadoop/src/main/java/org/apache/ignite/hadoop/fs/v2/package.html b/modules/hadoop/src/main/java/org/apache/ignite/hadoop/fs/v2/package.html
new file mode 100644
index 0000000..8adac96
--- /dev/null
+++ b/modules/hadoop/src/main/java/org/apache/ignite/hadoop/fs/v2/package.html
@@ -0,0 +1,24 @@
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<body>
+    <!-- Package description. -->
+    Contains Ignite Hadoop 2.x <code>FileSystem</code> implementation.
+</body>
+</html>

http://git-wip-us.apache.org/repos/asf/incubator-ignite/blob/6423cf02/modules/hadoop/src/main/java/org/apache/ignite/hadoop/mapreduce/IgniteHadoopClientProtocolProvider.java
----------------------------------------------------------------------
diff --git a/modules/hadoop/src/main/java/org/apache/ignite/hadoop/mapreduce/IgniteHadoopClientProtocolProvider.java b/modules/hadoop/src/main/java/org/apache/ignite/hadoop/mapreduce/IgniteHadoopClientProtocolProvider.java
new file mode 100644
index 0000000..83053ce
--- /dev/null
+++ b/modules/hadoop/src/main/java/org/apache/ignite/hadoop/mapreduce/IgniteHadoopClientProtocolProvider.java
@@ -0,0 +1,138 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.hadoop.mapreduce;
+
+import org.apache.hadoop.conf.*;
+import org.apache.hadoop.mapreduce.*;
+import org.apache.hadoop.mapreduce.protocol.*;
+import org.apache.ignite.*;
+import org.apache.ignite.internal.*;
+import org.apache.ignite.internal.client.*;
+import org.apache.ignite.internal.client.marshaller.optimized.*;
+import org.apache.ignite.internal.processors.hadoop.proto.*;
+import org.apache.ignite.internal.util.future.*;
+import org.apache.ignite.internal.util.typedef.*;
+
+import java.io.*;
+import java.net.*;
+import java.util.*;
+import java.util.concurrent.*;
+
+import static org.apache.ignite.internal.client.GridClientProtocol.*;
+import static org.apache.ignite.internal.processors.hadoop.proto.HadoopClientProtocol.*;
+
+
+/**
+ * Ignite Hadoop client protocol provider.
+ */
+public class IgniteHadoopClientProtocolProvider extends ClientProtocolProvider {
+    /** Clients. */
+    private static final ConcurrentHashMap<String, IgniteInternalFuture<GridClient>> cliMap = new ConcurrentHashMap<>();
+
+    /** {@inheritDoc} */
+    @Override public ClientProtocol create(Configuration conf) throws IOException {
+        if (FRAMEWORK_NAME.equals(conf.get(MRConfig.FRAMEWORK_NAME))) {
+            String addr = conf.get(MRConfig.MASTER_ADDRESS);
+
+            if (F.isEmpty(addr))
+                throw new IOException("Failed to create client protocol because server address is not specified (is " +
+                    MRConfig.MASTER_ADDRESS + " property set?).");
+
+            if (F.eq(addr, "local"))
+                throw new IOException("Local execution mode is not supported, please point " +
+                    MRConfig.MASTER_ADDRESS + " to real Ignite node.");
+
+            return createProtocol(addr, conf);
+        }
+
+        return null;
+    }
+
+    /** {@inheritDoc} */
+    @Override public ClientProtocol create(InetSocketAddress addr, Configuration conf) throws IOException {
+        if (FRAMEWORK_NAME.equals(conf.get(MRConfig.FRAMEWORK_NAME)))
+            return createProtocol(addr.getHostString() + ":" + addr.getPort(), conf);
+
+        return null;
+    }
+
+    /** {@inheritDoc} */
+    @Override public void close(ClientProtocol cliProto) throws IOException {
+        // No-op.
+    }
+
+    /**
+     * Internal protocol creation routine.
+     *
+     * @param addr Address.
+     * @param conf Configuration.
+     * @return Client protocol.
+     * @throws IOException If failed.
+     */
+    private static ClientProtocol createProtocol(String addr, Configuration conf) throws IOException {
+        return new HadoopClientProtocol(conf, client(addr));
+    }
+
+    /**
+     * Create client.
+     *
+     * @param addr Endpoint address.
+     * @return Client.
+     * @throws IOException If failed.
+     */
+    private static GridClient client(String addr) throws IOException {
+        try {
+            IgniteInternalFuture<GridClient> fut = cliMap.get(addr);
+
+            if (fut == null) {
+                GridFutureAdapter<GridClient> fut0 = new GridFutureAdapter<>();
+
+                IgniteInternalFuture<GridClient> oldFut = cliMap.putIfAbsent(addr, fut0);
+
+                if (oldFut != null)
+                    return oldFut.get();
+                else {
+                    GridClientConfiguration cliCfg = new GridClientConfiguration();
+
+                    cliCfg.setProtocol(TCP);
+                    cliCfg.setServers(Collections.singletonList(addr));
+                    cliCfg.setMarshaller(new GridClientOptimizedMarshaller());
+                    cliCfg.setDaemon(true);
+
+                    try {
+                        GridClient cli = GridClientFactory.start(cliCfg);
+
+                        fut0.onDone(cli);
+
+                        return cli;
+                    }
+                    catch (GridClientException e) {
+                        fut0.onDone(e);
+
+                        throw new IOException("Failed to establish connection with Ignite node: " + addr, e);
+                    }
+                }
+            }
+            else
+                return fut.get();
+        }
+        catch (IgniteCheckedException e) {
+            throw new IOException("Failed to establish connection with Ignite node: " + addr, e);
+        }
+    }
+}


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