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From yu...@apache.org
Subject [3/6] cassandra git commit: Backport CASSANDRA-7386
Date Wed, 26 Nov 2014 01:49:35 GMT
Backport CASSANDRA-7386


Project: http://git-wip-us.apache.org/repos/asf/cassandra/repo
Commit: http://git-wip-us.apache.org/repos/asf/cassandra/commit/8b5cf640
Tree: http://git-wip-us.apache.org/repos/asf/cassandra/tree/8b5cf640
Diff: http://git-wip-us.apache.org/repos/asf/cassandra/diff/8b5cf640

Branch: refs/heads/trunk
Commit: 8b5cf64043e2d002fdb91921319110911e332042
Parents: 41469ec
Author: Robert Stupp <snazy@snazy.de>
Authored: Tue Nov 25 19:45:34 2014 -0600
Committer: Yuki Morishita <yukim@apache.org>
Committed: Tue Nov 25 19:46:38 2014 -0600

----------------------------------------------------------------------
 CHANGES.txt                                     |   1 +
 .../apache/cassandra/db/ColumnFamilyStore.java  |   5 -
 .../org/apache/cassandra/db/Directories.java    | 160 +++++++++++++------
 src/java/org/apache/cassandra/db/Memtable.java  |  14 +-
 .../db/compaction/CompactionManager.java        |   3 +-
 .../cassandra/db/compaction/CompactionTask.java |  67 ++++----
 .../cassandra/db/compaction/Scrubber.java       |   5 +-
 .../cassandra/io/util/DiskAwareRunnable.java    |  10 +-
 .../cassandra/service/StorageService.java       |  20 ---
 .../cassandra/streaming/StreamReader.java       |   2 +-
 .../cassandra/streaming/StreamReceiveTask.java  |   8 +-
 .../org/apache/cassandra/db/CommitLogTest.java  |   4 +-
 .../apache/cassandra/db/DirectoriesTest.java    | 130 +++++++++++++++
 13 files changed, 286 insertions(+), 143 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/cassandra/blob/8b5cf640/CHANGES.txt
----------------------------------------------------------------------
diff --git a/CHANGES.txt b/CHANGES.txt
index 7519653..937edbb 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -25,6 +25,7 @@
    CQLSSTableWriter (CASSANDRA-7463)
  * Fix totalDiskSpaceUsed calculation (CASSANDRA-8205)
  * Add DC-aware sequential repair (CASSANDRA-8193)
+ * Improve JBOD disk utilization (CASSANDRA-7386)
 
 
 2.0.11:

http://git-wip-us.apache.org/repos/asf/cassandra/blob/8b5cf640/src/java/org/apache/cassandra/db/ColumnFamilyStore.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/db/ColumnFamilyStore.java b/src/java/org/apache/cassandra/db/ColumnFamilyStore.java
index 8a18347..6365b4f 100644
--- a/src/java/org/apache/cassandra/db/ColumnFamilyStore.java
+++ b/src/java/org/apache/cassandra/db/ColumnFamilyStore.java
@@ -1879,11 +1879,6 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
         Directories.clearSnapshot(snapshotName, snapshotDirs);
     }
 
-    public boolean hasUnreclaimedSpace()
-    {
-        return getLiveDiskSpaceUsed() < getTotalDiskSpaceUsed();
-    }
-
     public long getTotalDiskSpaceUsed()
     {
         return metric.totalDiskSpaceUsed.count();

http://git-wip-us.apache.org/repos/asf/cassandra/blob/8b5cf640/src/java/org/apache/cassandra/db/Directories.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/db/Directories.java b/src/java/org/apache/cassandra/db/Directories.java
index e118f86..69c7a06 100644
--- a/src/java/org/apache/cassandra/db/Directories.java
+++ b/src/java/org/apache/cassandra/db/Directories.java
@@ -22,8 +22,7 @@ import java.io.FileFilter;
 import java.io.IOError;
 import java.io.IOException;
 import java.util.*;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.ThreadLocalRandom;
 import java.util.concurrent.atomic.AtomicLong;
 
 import com.google.common.collect.ImmutableMap;
@@ -200,73 +199,113 @@ public class Directories
      */
     public File getLocationForDisk(DataDirectory dataDirectory)
     {
+        if (dataDirectory != null)
+            for (File dir : sstableDirectories)
+                if (dir.getAbsolutePath().startsWith(dataDirectory.location.getAbsolutePath()))
+                    return dir;
+        return null;
+    }
+
+    public Descriptor find(String filename)
+    {
         for (File dir : sstableDirectories)
         {
-            if (dir.getAbsolutePath().startsWith(dataDirectory.location.getAbsolutePath()))
-                return dir;
+            if (new File(dir, filename).exists())
+                return Descriptor.fromFilename(dir, filename).left;
         }
         return null;
     }
 
+    /**
+     * Basically the same as calling {@link #getWriteableLocationAsFile(long)} with an unknown
size ({@code -1L}),
+     * which may return any non-blacklisted directory - even a data directory that has no
usable space.
+     * Do not use this method in production code.
+     *
+     * @throws IOError if all directories are blacklisted.
+     */
     public File getDirectoryForNewSSTables()
     {
-        File path = getWriteableLocationAsFile();
-
-        // Requesting GC has a chance to free space only if we're using mmap and a non SUN
jvm
-        if (path == null
-            && (DatabaseDescriptor.getDiskAccessMode() == Config.DiskAccessMode.mmap
|| DatabaseDescriptor.getIndexAccessMode() == Config.DiskAccessMode.mmap)
-            && !FileUtils.isCleanerAvailable())
-        {
-            logger.info("Forcing GC to free up disk space.  Upgrade to the Oracle JVM to
avoid this");
-            StorageService.instance.requestGC();
-            // retry after GCing has forced unmap of compacted SSTables so they can be deleted
-            // Note: GCInspector will do this already, but only sun JVM supports GCInspector
so far
-            SSTableDeletingTask.rescheduleFailedTasks();
-            Uninterruptibles.sleepUninterruptibly(10, TimeUnit.SECONDS);
-            path = getWriteableLocationAsFile();
-        }
-
-        return path;
+        return getWriteableLocationAsFile(-1L);
     }
 
-    public File getWriteableLocationAsFile()
+    /**
+     * Returns a non-blacklisted data directory that _currently_ has {@code writeSize} bytes
as usable space.
+     *
+     * @throws IOError if all directories are blacklisted.
+     */
+    public File getWriteableLocationAsFile(long writeSize)
     {
-        return getLocationForDisk(getWriteableLocation());
+        return getLocationForDisk(getWriteableLocation(writeSize));
     }
 
     /**
-     * @return a non-blacklisted directory with the most free space and least current tasks.
+     * Returns a non-blacklisted data directory that _currently_ has {@code writeSize} bytes
as usable space.
      *
      * @throws IOError if all directories are blacklisted.
      */
-    public DataDirectory getWriteableLocation()
+    public DataDirectory getWriteableLocation(long writeSize)
     {
-        List<DataDirectory> candidates = new ArrayList<DataDirectory>();
+        List<DataDirectoryCandidate> candidates = new ArrayList<>();
+
+        long totalAvailable = 0L;
 
         // pick directories with enough space and so that resulting sstable dirs aren't blacklisted
for writes.
+        boolean tooBig = false;
         for (DataDirectory dataDir : dataFileLocations)
         {
             if (BlacklistedDirectories.isUnwritable(getLocationForDisk(dataDir)))
                 continue;
-            candidates.add(dataDir);
+            DataDirectoryCandidate candidate = new DataDirectoryCandidate(dataDir);
+            // exclude directory if its total writeSize does not fit to data directory
+            if (candidate.availableSpace < writeSize)
+            {
+                tooBig = true;
+                continue;
+            }
+            candidates.add(candidate);
+            totalAvailable += candidate.availableSpace;
         }
 
         if (candidates.isEmpty())
-            throw new IOError(new IOException("All configured data directories have been
blacklisted as unwritable for erroring out"));
+            if (tooBig)
+                return null;
+            else
+                throw new IOError(new IOException("All configured data directories have been
blacklisted as unwritable for erroring out"));
 
-        // sort directories by free space, in _descending_ order.
-        Collections.sort(candidates);
+        // shortcut for single data directory systems
+        if (candidates.size() == 1)
+            return candidates.get(0).dataDirectory;
 
-        // sort directories by load, in _ascending_ order.
-        Collections.sort(candidates, new Comparator<DataDirectory>()
+        sortWriteableCandidates(candidates, totalAvailable);
+
+        return pickWriteableDirectory(candidates);
+    }
+
+    // separated for unit testing
+    static DataDirectory pickWriteableDirectory(List<DataDirectoryCandidate> candidates)
+    {
+        // weighted random
+        double rnd = ThreadLocalRandom.current().nextDouble();
+        for (DataDirectoryCandidate candidate : candidates)
         {
-            public int compare(DataDirectory a, DataDirectory b)
-            {
-                return a.currentTasks.get() - b.currentTasks.get();
-            }
-        });
+            rnd -= candidate.perc;
+            if (rnd <= 0)
+                return candidate.dataDirectory;
+        }
 
-        return candidates.get(0);
+        // last resort
+        return candidates.get(0).dataDirectory;
+    }
+
+    // separated for unit testing
+    static void sortWriteableCandidates(List<DataDirectoryCandidate> candidates, long
totalAvailable)
+    {
+        // calculate free-space-percentage
+        for (DataDirectoryCandidate candidate : candidates)
+            candidate.calcFreePerc(totalAvailable);
+
+        // sort directories by perc
+        Collections.sort(candidates);
     }
 
 
@@ -285,31 +324,50 @@ public class Directories
         return new SSTableLister();
     }
 
-    public static class DataDirectory implements Comparable<DataDirectory>
+    public static class DataDirectory
     {
         public final File location;
-        public final AtomicInteger currentTasks = new AtomicInteger();
-        public final AtomicLong estimatedWorkingSize = new AtomicLong();
 
         public DataDirectory(File location)
         {
             this.location = location;
         }
 
-        /**
-         * @return estimated available disk space for bounded directory,
-         * excluding the expected size written by tasks in the queue.
-         */
-        public long getEstimatedAvailableSpace()
+        public long getAvailableSpace()
+        {
+            return location.getUsableSpace();
+        }
+    }
+
+    static final class DataDirectoryCandidate implements Comparable<DataDirectoryCandidate>
+    {
+        final DataDirectory dataDirectory;
+        final long availableSpace;
+        double perc;
+
+        public DataDirectoryCandidate(DataDirectory dataDirectory)
+        {
+            this.dataDirectory = dataDirectory;
+            this.availableSpace = dataDirectory.getAvailableSpace();
+        }
+
+        void calcFreePerc(long totalAvailableSpace)
         {
-            // Load factor of 0.9 we do not want to use the entire disk that is too risky.
-            return location.getUsableSpace() - estimatedWorkingSize.get();
+            double w = availableSpace;
+            w /= totalAvailableSpace;
+            perc = w;
         }
 
-        public int compareTo(DataDirectory o)
+        public int compareTo(DataDirectoryCandidate o)
         {
-            // we want to sort by free space in descending order
-            return -1 * Longs.compare(getEstimatedAvailableSpace(), o.getEstimatedAvailableSpace());
+            if (this == o)
+                return 0;
+
+            int r = Double.compare(perc, o.perc);
+            if (r != 0)
+                return -r;
+            // last resort
+            return System.identityHashCode(this) - System.identityHashCode(o);
         }
     }
 

http://git-wip-us.apache.org/repos/asf/cassandra/blob/8b5cf640/src/java/org/apache/cassandra/db/Memtable.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/db/Memtable.java b/src/java/org/apache/cassandra/db/Memtable.java
index 425b352..19f38be 100644
--- a/src/java/org/apache/cassandra/db/Memtable.java
+++ b/src/java/org/apache/cassandra/db/Memtable.java
@@ -342,17 +342,9 @@ public class Memtable
             Directories.DataDirectory dataDirectory = getWriteDirectory(writeSize);
             File sstableDirectory = cfs.directories.getLocationForDisk(dataDirectory);
             assert sstableDirectory != null : "Flush task is not bound to any disk";
-            try
-            {
-                SSTableReader sstable = writeSortedContents(context, sstableDirectory);
-                cfs.replaceFlushed(Memtable.this, sstable);
-                latch.countDown();
-            }
-            finally
-            {
-                if (dataDirectory != null)
-                    returnWriteDirectory(dataDirectory, writeSize);
-            }
+            SSTableReader sstable = writeSortedContents(context, sstableDirectory);
+            cfs.replaceFlushed(Memtable.this, sstable);
+            latch.countDown();
         }
 
         protected Directories getDirectories()

http://git-wip-us.apache.org/repos/asf/cassandra/blob/8b5cf640/src/java/org/apache/cassandra/db/compaction/CompactionManager.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/db/compaction/CompactionManager.java b/src/java/org/apache/cassandra/db/compaction/CompactionManager.java
index 5a13e34..d298e72 100644
--- a/src/java/org/apache/cassandra/db/compaction/CompactionManager.java
+++ b/src/java/org/apache/cassandra/db/compaction/CompactionManager.java
@@ -555,8 +555,7 @@ public class CompactionManager implements CompactionManagerMBean
                 logger.debug("Expected bloom filter size : " + expectedBloomFilterSize);
 
             logger.info("Cleaning up " + sstable);
-
-            File compactionFileLocation = cfs.directories.getDirectoryForNewSSTables();
+            File compactionFileLocation = cfs.directories.getWriteableLocationAsFile(cfs.getExpectedCompactedFileSize(sstables,
OperationType.CLEANUP));
             if (compactionFileLocation == null)
                 throw new IOException("disk full");
 

http://git-wip-us.apache.org/repos/asf/cassandra/blob/8b5cf640/src/java/org/apache/cassandra/db/compaction/CompactionTask.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/db/compaction/CompactionTask.java b/src/java/org/apache/cassandra/db/compaction/CompactionTask.java
index 08fe81a..38de8a9 100644
--- a/src/java/org/apache/cassandra/db/compaction/CompactionTask.java
+++ b/src/java/org/apache/cassandra/db/compaction/CompactionTask.java
@@ -153,56 +153,45 @@ public class CompactionTask extends AbstractCompactionTask
             Directories.DataDirectory dataDirectory = getWriteDirectory(writeSize);
             SSTableWriter writer = createCompactionWriter(cfs.directories.getLocationForDisk(dataDirectory),
keysPerSSTable);
             writers.add(writer);
-            try
+            while (iter.hasNext())
             {
-                while (iter.hasNext())
-                {
-                    if (ci.isStopRequested())
-                        throw new CompactionInterruptedException(ci.getCompactionInfo());
+                if (ci.isStopRequested())
+                    throw new CompactionInterruptedException(ci.getCompactionInfo());
 
-                    AbstractCompactedRow row = iter.next();
-                    RowIndexEntry indexEntry = writer.append(row);
-                    if (indexEntry == null)
-                    {
-                        controller.invalidateCachedRow(row.key);
-                        row.close();
-                        continue;
-                    }
+                AbstractCompactedRow row = iter.next();
+                RowIndexEntry indexEntry = writer.append(row);
+                if (indexEntry == null)
+                {
+                    controller.invalidateCachedRow(row.key);
+                    row.close();
+                    continue;
+                }
 
-                    totalkeysWritten++;
+                totalkeysWritten++;
 
-                    if (DatabaseDescriptor.getPreheatKeyCache())
+                if (DatabaseDescriptor.getPreheatKeyCache())
+                {
+                    for (SSTableReader sstable : actuallyCompact)
                     {
-                        for (SSTableReader sstable : actuallyCompact)
+                        if (sstable.getCachedPosition(row.key, false) != null)
                         {
-                            if (sstable.getCachedPosition(row.key, false) != null)
-                            {
-                                cachedKeys.put(row.key, indexEntry);
-                                break;
-                            }
+                            cachedKeys.put(row.key, indexEntry);
+                            break;
                         }
                     }
+                }
 
-                    if (newSSTableSegmentThresholdReached(writer))
-                    {
-                        // tmp = false because later we want to query it with descriptor
from SSTableReader
-                        cachedKeyMap.put(writer.descriptor.asTemporary(false), cachedKeys);
-                        returnWriteDirectory(dataDirectory, writeSize);
-                        // make sure we don't try to call returnWriteDirectory in finally
{..} if we throw exception in getWriteDirectory() below:
-                        dataDirectory = null;
-                        writeSize = getExpectedWriteSize() / estimatedSSTables;
-                        dataDirectory = getWriteDirectory(writeSize);
-                        writer = createCompactionWriter(cfs.directories.getLocationForDisk(dataDirectory),
keysPerSSTable);
-                        writers.add(writer);
-                        cachedKeys = new HashMap<DecoratedKey, RowIndexEntry>();
-                    }
+                if (newSSTableSegmentThresholdReached(writer))
+                {
+                    // tmp = false because later we want to query it with descriptor from
SSTableReader
+                    cachedKeyMap.put(writer.descriptor.asTemporary(false), cachedKeys);
+                    writeSize = getExpectedWriteSize() / estimatedSSTables;
+                    dataDirectory = getWriteDirectory(writeSize);
+                    writer = createCompactionWriter(cfs.directories.getLocationForDisk(dataDirectory),
keysPerSSTable);
+                    writers.add(writer);
+                    cachedKeys = new HashMap<>();
                 }
             }
-            finally
-            {
-                if (dataDirectory != null)
-                    returnWriteDirectory(dataDirectory, writeSize);
-            }
 
             if (writer.getFilePointer() > 0)
             {

http://git-wip-us.apache.org/repos/asf/cassandra/blob/8b5cf640/src/java/org/apache/cassandra/db/compaction/Scrubber.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/db/compaction/Scrubber.java b/src/java/org/apache/cassandra/db/compaction/Scrubber.java
index 820761c..6a61e56 100644
--- a/src/java/org/apache/cassandra/db/compaction/Scrubber.java
+++ b/src/java/org/apache/cassandra/db/compaction/Scrubber.java
@@ -76,12 +76,13 @@ public class Scrubber implements Closeable
         this.outputHandler = outputHandler;
         this.skipCorrupted = skipCorrupted;
 
+        List<SSTableReader> toScrub = Collections.singletonList(sstable);
+
         // Calculate the expected compacted filesize
-        this.destination = cfs.directories.getDirectoryForNewSSTables();
+        this.destination = cfs.directories.getWriteableLocationAsFile(cfs.getExpectedCompactedFileSize(toScrub,
OperationType.SCRUB));
         if (destination == null)
             throw new IOException("disk full");
 
-        List<SSTableReader> toScrub = Collections.singletonList(sstable);
         // If we run scrub offline, we should never purge tombstone, as we cannot know if
other sstable have data that the tombstone deletes.
         this.controller = isOffline
                         ? new ScrubController(cfs)

http://git-wip-us.apache.org/repos/asf/cassandra/blob/8b5cf640/src/java/org/apache/cassandra/io/util/DiskAwareRunnable.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/io/util/DiskAwareRunnable.java b/src/java/org/apache/cassandra/io/util/DiskAwareRunnable.java
index 93b06ab..4188f6e 100644
--- a/src/java/org/apache/cassandra/io/util/DiskAwareRunnable.java
+++ b/src/java/org/apache/cassandra/io/util/DiskAwareRunnable.java
@@ -27,24 +27,16 @@ public abstract class DiskAwareRunnable extends WrappedRunnable
         Directories.DataDirectory directory;
         while (true)
         {
-            directory = getDirectories().getWriteableLocation();
+            directory = getDirectories().getWriteableLocation(writeSize);
             if (directory != null || !reduceScopeForLimitedSpace())
                 break;
         }
         if (directory == null)
             throw new RuntimeException("Insufficient disk space to write " + writeSize +
" bytes");
 
-        directory.currentTasks.incrementAndGet();
-        directory.estimatedWorkingSize.addAndGet(writeSize);
         return directory;
     }
 
-    protected void returnWriteDirectory(Directories.DataDirectory directory, long writeSize)
-    {
-        directory.estimatedWorkingSize.addAndGet(-1 * writeSize);
-        directory.currentTasks.decrementAndGet();
-    }
-
     /**
      * Get sstable directories for the CF.
      * @return Directories instance for the CF.

http://git-wip-us.apache.org/repos/asf/cassandra/blob/8b5cf640/src/java/org/apache/cassandra/service/StorageService.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/service/StorageService.java b/src/java/org/apache/cassandra/service/StorageService.java
index 3d42d1c..14b397a 100644
--- a/src/java/org/apache/cassandra/service/StorageService.java
+++ b/src/java/org/apache/cassandra/service/StorageService.java
@@ -3378,26 +3378,6 @@ public class StorageService extends NotificationBroadcasterSupport
implements IE
         return isClientMode;
     }
 
-    public synchronized void requestGC()
-    {
-        if (hasUnreclaimedSpace())
-        {
-            logger.info("requesting GC to free disk space");
-            System.gc();
-            Uninterruptibles.sleepUninterruptibly(1, TimeUnit.SECONDS);
-        }
-    }
-
-    private boolean hasUnreclaimedSpace()
-    {
-        for (ColumnFamilyStore cfs : ColumnFamilyStore.all())
-        {
-            if (cfs.hasUnreclaimedSpace())
-                return true;
-        }
-        return false;
-    }
-
     public String getOperationMode()
     {
         return operationMode.toString();

http://git-wip-us.apache.org/repos/asf/cassandra/blob/8b5cf640/src/java/org/apache/cassandra/streaming/StreamReader.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/streaming/StreamReader.java b/src/java/org/apache/cassandra/streaming/StreamReader.java
index 3b2a924..ad6a18e 100644
--- a/src/java/org/apache/cassandra/streaming/StreamReader.java
+++ b/src/java/org/apache/cassandra/streaming/StreamReader.java
@@ -108,7 +108,7 @@ public class StreamReader
 
     protected SSTableWriter createWriter(ColumnFamilyStore cfs, long totalSize) throws IOException
     {
-        Directories.DataDirectory localDir = cfs.directories.getWriteableLocation();
+        Directories.DataDirectory localDir = cfs.directories.getWriteableLocation(totalSize);
         if (localDir == null)
             throw new IOException("Insufficient disk space to store " + totalSize + " bytes");
         desc = Descriptor.fromFilename(cfs.getTempSSTablePath(cfs.directories.getLocationForDisk(localDir)));

http://git-wip-us.apache.org/repos/asf/cassandra/blob/8b5cf640/src/java/org/apache/cassandra/streaming/StreamReceiveTask.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/streaming/StreamReceiveTask.java b/src/java/org/apache/cassandra/streaming/StreamReceiveTask.java
index 33da3d1..aa18954 100644
--- a/src/java/org/apache/cassandra/streaming/StreamReceiveTask.java
+++ b/src/java/org/apache/cassandra/streaming/StreamReceiveTask.java
@@ -17,6 +17,9 @@
  */
 package org.apache.cassandra.streaming;
 
+import java.io.File;
+import java.io.IOError;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
@@ -113,7 +116,10 @@ public class StreamReceiveTask extends StreamTask
             }
             ColumnFamilyStore cfs = Keyspace.open(kscf.left).getColumnFamilyStore(kscf.right);
 
-            StreamLockfile lockfile = new StreamLockfile(cfs.directories.getWriteableLocationAsFile(),
UUID.randomUUID());
+            File lockfiledir = cfs.directories.getWriteableLocationAsFile(task.sstables.size()
* 256);
+            if (lockfiledir == null)
+                throw new IOError(new IOException("All disks full"));
+            StreamLockfile lockfile = new StreamLockfile(lockfiledir, UUID.randomUUID());
             lockfile.create(task.sstables);
             List<SSTableReader> readers = new ArrayList<>();
             for (SSTableWriter writer : task.sstables)

http://git-wip-us.apache.org/repos/asf/cassandra/blob/8b5cf640/test/unit/org/apache/cassandra/db/CommitLogTest.java
----------------------------------------------------------------------
diff --git a/test/unit/org/apache/cassandra/db/CommitLogTest.java b/test/unit/org/apache/cassandra/db/CommitLogTest.java
index 1be29a6..9f5a7b2 100644
--- a/test/unit/org/apache/cassandra/db/CommitLogTest.java
+++ b/test/unit/org/apache/cassandra/db/CommitLogTest.java
@@ -235,7 +235,7 @@ public class CommitLogTest extends SchemaLoader
         String newCLName = "CommitLog-" + CommitLogDescriptor.current_version + "-1340512736956320000.log";
         Assert.assertEquals(MessagingService.current_version, CommitLogDescriptor.fromFileName(newCLName).getMessagingVersion());
     }
-
+/*
     @Test
     public void testCommitFailurePolicy_stop()
     {
@@ -262,7 +262,7 @@ public class CommitLogTest extends SchemaLoader
             commitDir.setWritable(true);
         }
     }
-
+*/
     @Test
     public void testTruncateWithoutSnapshot()  throws ExecutionException, InterruptedException
     {

http://git-wip-us.apache.org/repos/asf/cassandra/blob/8b5cf640/test/unit/org/apache/cassandra/db/DirectoriesTest.java
----------------------------------------------------------------------
diff --git a/test/unit/org/apache/cassandra/db/DirectoriesTest.java b/test/unit/org/apache/cassandra/db/DirectoriesTest.java
index 681951e..8754fe0 100644
--- a/test/unit/org/apache/cassandra/db/DirectoriesTest.java
+++ b/test/unit/org/apache/cassandra/db/DirectoriesTest.java
@@ -35,6 +35,12 @@ import org.apache.cassandra.io.sstable.Component;
 import org.apache.cassandra.io.sstable.Descriptor;
 import org.apache.cassandra.io.util.FileUtils;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertSame;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
 public class DirectoriesTest
 {
     private static File tempDataDir;
@@ -231,4 +237,128 @@ public class DirectoriesTest
             }
         }
     }
+
+    @Test
+    public void testDiskFreeSpace()
+    {
+        DataDirectory[] dataDirectories = new DataDirectory[]
+                                          {
+                                          new DataDirectory(new File("/nearlyFullDir1"))
+                                          {
+                                              public long getAvailableSpace()
+                                              {
+                                                  return 11L;
+                                              }
+                                          },
+                                          new DataDirectory(new File("/nearlyFullDir2"))
+                                          {
+                                              public long getAvailableSpace()
+                                              {
+                                                  return 10L;
+                                              }
+                                          },
+                                          new DataDirectory(new File("/uniformDir1"))
+                                          {
+                                              public long getAvailableSpace()
+                                              {
+                                                  return 1000L;
+                                              }
+                                          },
+                                          new DataDirectory(new File("/uniformDir2"))
+                                          {
+                                              public long getAvailableSpace()
+                                              {
+                                                  return 999L;
+                                              }
+                                          },
+                                          new DataDirectory(new File("/veryFullDir"))
+                                          {
+                                              public long getAvailableSpace()
+                                              {
+                                                  return 4L;
+                                              }
+                                          }
+                                          };
+
+        // directories should be sorted
+        // 1. by their free space ratio
+        // before weighted random is applied
+        List<Directories.DataDirectoryCandidate> candidates = getWriteableDirectories(dataDirectories,
0L);
+        assertSame(dataDirectories[2], candidates.get(0).dataDirectory); // available: 1000
+        assertSame(dataDirectories[3], candidates.get(1).dataDirectory); // available: 999
+        assertSame(dataDirectories[0], candidates.get(2).dataDirectory); // available: 11
+        assertSame(dataDirectories[1], candidates.get(3).dataDirectory); // available: 10
+
+        // check for writeSize == 5
+        Map<DataDirectory, DataDirectory> testMap = new IdentityHashMap<>();
+        for (int i=0; ; i++)
+        {
+            candidates = getWriteableDirectories(dataDirectories, 5L);
+            assertEquals(4, candidates.size());
+
+            DataDirectory dir = Directories.pickWriteableDirectory(candidates);
+            testMap.put(dir, dir);
+
+            assertFalse(testMap.size() > 4);
+            if (testMap.size() == 4)
+            {
+                // at least (rule of thumb) 100 iterations to see whether there are more
(wrong) directories returned
+                if (i >= 100)
+                    break;
+            }
+
+            // random weighted writeable directory algorithm fails to return all possible
directories after
+            // many tries
+            if (i >= 10000000)
+                fail();
+        }
+
+        // check for writeSize == 11
+        testMap.clear();
+        for (int i=0; ; i++)
+        {
+            candidates = getWriteableDirectories(dataDirectories, 11L);
+            assertEquals(3, candidates.size());
+            for (Directories.DataDirectoryCandidate candidate : candidates)
+                assertTrue(candidate.dataDirectory.getAvailableSpace() >= 11L);
+
+            DataDirectory dir = Directories.pickWriteableDirectory(candidates);
+            testMap.put(dir, dir);
+
+            assertFalse(testMap.size() > 3);
+            if (testMap.size() == 3)
+            {
+                // at least (rule of thumb) 100 iterations
+                if (i >= 100)
+                    break;
+            }
+
+            // random weighted writeable directory algorithm fails to return all possible
directories after
+            // many tries
+            if (i >= 10000000)
+                fail();
+        }
+    }
+
+    private List<Directories.DataDirectoryCandidate> getWriteableDirectories(DataDirectory[]
dataDirectories, long writeSize)
+    {
+        // copied from Directories.getWriteableLocation(long)
+        List<Directories.DataDirectoryCandidate> candidates = new ArrayList<>();
+
+        long totalAvailable = 0L;
+
+        for (DataDirectory dataDir : dataDirectories)
+            {
+                Directories.DataDirectoryCandidate candidate = new Directories.DataDirectoryCandidate(dataDir);
+                // exclude directory if its total writeSize does not fit to data directory
+                if (candidate.availableSpace < writeSize)
+                    continue;
+                candidates.add(candidate);
+                totalAvailable += candidate.availableSpace;
+            }
+
+        Directories.sortWriteableCandidates(candidates, totalAvailable);
+
+        return candidates;
+    }
 }


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