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From su...@apache.org
Subject [17/50] [abbrv] hadoop git commit: HDFS-10896. Move lock logging logic from FSNamesystem into FSNamesystemLock. Contributed by Erik Krogen.
Date Mon, 03 Oct 2016 22:14:16 GMT
HDFS-10896. Move lock logging logic from FSNamesystem into FSNamesystemLock. Contributed by
Erik Krogen.


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/434c5ea7
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/434c5ea7
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/434c5ea7

Branch: refs/heads/YARN-2915
Commit: 434c5ea75dc3d87513e49290ac9999148ff5163c
Parents: 57aec2b
Author: Zhe Zhang <zhz@apache.org>
Authored: Fri Sep 30 13:15:59 2016 -0700
Committer: Zhe Zhang <zhz@apache.org>
Committed: Fri Sep 30 13:16:08 2016 -0700

----------------------------------------------------------------------
 .../hdfs/server/namenode/FSNamesystem.java      | 147 +--------
 .../hdfs/server/namenode/FSNamesystemLock.java  | 187 ++++++++++-
 .../hdfs/server/namenode/TestFSNamesystem.java  | 292 -----------------
 .../server/namenode/TestFSNamesystemLock.java   | 317 +++++++++++++++++++
 4 files changed, 496 insertions(+), 447 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/434c5ea7/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
index 4700263..1721b2c 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
@@ -71,12 +71,6 @@ import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_MAX_OBJECTS_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_NAME_DIR_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_RESOURCE_CHECK_INTERVAL_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_RESOURCE_CHECK_INTERVAL_KEY;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_KEY;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_DEFAULT;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_READ_LOCK_REPORTING_THRESHOLD_MS_KEY;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_READ_LOCK_REPORTING_THRESHOLD_MS_DEFAULT;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_LOCK_SUPPRESS_WARNING_INTERVAL_KEY;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_LOCK_SUPPRESS_WARNING_INTERVAL_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_RETRY_CACHE_EXPIRYTIME_MILLIS_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_RETRY_CACHE_EXPIRYTIME_MILLIS_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_RETRY_CACHE_HEAP_PERCENT_DEFAULT;
@@ -129,8 +123,6 @@ import java.util.TreeMap;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
-import java.util.concurrent.atomic.AtomicInteger;
-import java.util.concurrent.atomic.AtomicLong;
 import java.util.concurrent.locks.Condition;
 import java.util.concurrent.locks.ReentrantLock;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
@@ -284,7 +276,6 @@ import org.apache.hadoop.util.Daemon;
 import org.apache.hadoop.util.DataChecksum;
 import org.apache.hadoop.util.ReflectionUtils;
 import org.apache.hadoop.util.StringUtils;
-import org.apache.hadoop.util.Timer;
 import org.apache.hadoop.util.VersionInfo;
 import org.apache.log4j.Appender;
 import org.apache.log4j.AsyncAppender;
@@ -713,12 +704,9 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
       LOG.info("Enabling async auditlog");
       enableAsyncAuditLog();
     }
-    boolean fair = conf.getBoolean("dfs.namenode.fslock.fair", true);
-    LOG.info("fsLock is fair:" + fair);
-    fsLock = new FSNamesystemLock(fair);
-    cond = fsLock.writeLock().newCondition();
+    fsLock = new FSNamesystemLock(conf);
+    cond = fsLock.newWriteLockCondition();
     cpLock = new ReentrantLock();
-    setTimer(new Timer());
 
     this.fsImage = fsImage;
     try {
@@ -827,17 +815,6 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
           DFS_NAMENODE_MAX_LOCK_HOLD_TO_RELEASE_LEASE_MS_KEY,
           DFS_NAMENODE_MAX_LOCK_HOLD_TO_RELEASE_LEASE_MS_DEFAULT);
 
-      this.writeLockReportingThreshold = conf.getLong(
-          DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_KEY,
-          DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_DEFAULT);
-      this.readLockReportingThreshold = conf.getLong(
-          DFS_NAMENODE_READ_LOCK_REPORTING_THRESHOLD_MS_KEY,
-          DFS_NAMENODE_READ_LOCK_REPORTING_THRESHOLD_MS_DEFAULT);
-
-      this.lockSuppressWarningInterval = conf.getTimeDuration(
-          DFS_LOCK_SUPPRESS_WARNING_INTERVAL_KEY,
-          DFS_LOCK_SUPPRESS_WARNING_INTERVAL_DEFAULT, TimeUnit.MILLISECONDS);
-
       // For testing purposes, allow the DT secret manager to be started regardless
       // of whether security is enabled.
       alwaysUseDelegationTokensForTests = conf.getBoolean(
@@ -1516,131 +1493,25 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
     return Util.stringCollectionAsURIs(dirNames);
   }
 
-  private final long lockSuppressWarningInterval;
-  /** Threshold (ms) for long holding write lock report. */
-  private final long writeLockReportingThreshold;
-  private int numWriteLockWarningsSuppressed = 0;
-  private long timeStampOfLastWriteLockReport = 0;
-  private long longestWriteLockHeldInterval = 0;
-  /** Last time stamp for write lock. Keep the longest one for multi-entrance.*/
-  private long writeLockHeldTimeStamp;
-  /** Threshold (ms) for long holding read lock report. */
-  private long readLockReportingThreshold;
-  private AtomicInteger numReadLockWarningsSuppressed = new AtomicInteger(0);
-  private AtomicLong timeStampOfLastReadLockReport = new AtomicLong(0);
-  private AtomicLong longestReadLockHeldInterval = new AtomicLong(0);
-  private Timer timer;
-  /**
-   * Last time stamp for read lock. Keep the longest one for
-   * multi-entrance. This is ThreadLocal since there could be
-   * many read locks held simultaneously.
-   */
-  private static ThreadLocal<Long> readLockHeldTimeStamp =
-      new ThreadLocal<Long>() {
-        @Override
-        public Long initialValue() {
-          return Long.MAX_VALUE;
-        }
-      };
-
   @Override
   public void readLock() {
-    this.fsLock.readLock().lock();
-    if (this.fsLock.getReadHoldCount() == 1) {
-      readLockHeldTimeStamp.set(timer.monotonicNow());
-    }
+    this.fsLock.readLock();
   }
   @Override
   public void readUnlock() {
-    final boolean needReport = this.fsLock.getReadHoldCount() == 1;
-    final long readLockInterval = timer.monotonicNow() -
-        readLockHeldTimeStamp.get();
-    if (needReport) {
-      readLockHeldTimeStamp.remove();
-    }
-
-    this.fsLock.readLock().unlock();
-
-    if (needReport && readLockInterval >= this.readLockReportingThreshold) {
-      long localLongestReadLock;
-      do {
-        localLongestReadLock = longestReadLockHeldInterval.get();
-      } while (localLongestReadLock - readLockInterval < 0
-          && !longestReadLockHeldInterval.compareAndSet(localLongestReadLock,
-                                                        readLockInterval));
-
-      long localTimeStampOfLastReadLockReport;
-      long now;
-      do {
-        now = timer.monotonicNow();
-        localTimeStampOfLastReadLockReport = timeStampOfLastReadLockReport
-            .get();
-        if (now - localTimeStampOfLastReadLockReport <
-            lockSuppressWarningInterval) {
-          numReadLockWarningsSuppressed.incrementAndGet();
-          return;
-        }
-      } while (!timeStampOfLastReadLockReport.compareAndSet(
-          localTimeStampOfLastReadLockReport, now));
-      int numSuppressedWarnings = numReadLockWarningsSuppressed.getAndSet(0);
-      long longestLockHeldInterval = longestReadLockHeldInterval.getAndSet(0);
-      LOG.info("FSNamesystem read lock held for " + readLockInterval +
-          " ms via\n" + StringUtils.getStackTrace(Thread.currentThread()) +
-          "\tNumber of suppressed read-lock reports: " +
-          numSuppressedWarnings + "\n\tLongest read-lock held interval: " +
-          longestLockHeldInterval);
-    }
+    this.fsLock.readUnlock();
   }
   @Override
   public void writeLock() {
-    this.fsLock.writeLock().lock();
-    if (fsLock.getWriteHoldCount() == 1) {
-      writeLockHeldTimeStamp = timer.monotonicNow();
-    }
+    this.fsLock.writeLock();
   }
   @Override
   public void writeLockInterruptibly() throws InterruptedException {
-    this.fsLock.writeLock().lockInterruptibly();
-    if (fsLock.getWriteHoldCount() == 1) {
-      writeLockHeldTimeStamp = timer.monotonicNow();
-    }
+    this.fsLock.writeLockInterruptibly();
   }
   @Override
   public void writeUnlock() {
-    final boolean needReport = fsLock.getWriteHoldCount() == 1 &&
-        fsLock.isWriteLockedByCurrentThread();
-    final long currentTime = timer.monotonicNow();
-    final long writeLockInterval = currentTime - writeLockHeldTimeStamp;
-
-    boolean logReport = false;
-    int numSuppressedWarnings = 0;
-    long longestLockHeldInterval = 0;
-    if (needReport && writeLockInterval >= this.writeLockReportingThreshold) {
-      if (writeLockInterval > longestWriteLockHeldInterval) {
-        longestWriteLockHeldInterval = writeLockInterval;
-      }
-      if (currentTime - timeStampOfLastWriteLockReport > this
-          .lockSuppressWarningInterval) {
-        logReport = true;
-        numSuppressedWarnings = numWriteLockWarningsSuppressed;
-        numWriteLockWarningsSuppressed = 0;
-        longestLockHeldInterval = longestWriteLockHeldInterval;
-        longestWriteLockHeldInterval = 0;
-        timeStampOfLastWriteLockReport = currentTime;
-      } else {
-        numWriteLockWarningsSuppressed++;
-      }
-    }
-
-    this.fsLock.writeLock().unlock();
-
-    if (logReport) {
-      LOG.info("FSNamesystem write lock held for " + writeLockInterval +
-          " ms via\n" + StringUtils.getStackTrace(Thread.currentThread()) +
-          "\tNumber of suppressed write-lock reports: " +
-          numSuppressedWarnings + "\n\tLongest write-lock held interval: " +
-              longestLockHeldInterval);
-    }
+    this.fsLock.writeUnlock();
   }
   @Override
   public boolean hasWriteLock() {
@@ -7173,9 +7044,5 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
         .size();
   }
 
-  @VisibleForTesting
-  void setTimer(Timer newTimer) {
-    this.timer = newTimer;
-  }
 }
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/434c5ea7/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java
index d239796..043f569 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java
@@ -19,33 +19,186 @@
 
 package org.apache.hadoop.hdfs.server.namenode;
 
-import java.util.concurrent.locks.Lock;
-import java.util.concurrent.locks.ReadWriteLock;
-import java.util.concurrent.locks.ReentrantLock;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.concurrent.locks.Condition;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
 
 import com.google.common.annotations.VisibleForTesting;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.util.StringUtils;
+import org.apache.hadoop.util.Timer;
+
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_LOCK_SUPPRESS_WARNING_INTERVAL_DEFAULT;
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_LOCK_SUPPRESS_WARNING_INTERVAL_KEY;
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_READ_LOCK_REPORTING_THRESHOLD_MS_DEFAULT;
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_READ_LOCK_REPORTING_THRESHOLD_MS_KEY;
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_DEFAULT;
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_KEY;
 
 /**
- * Mimics a ReentrantReadWriteLock so more sophisticated locking capabilities
- * are possible.
+ * Mimics a ReentrantReadWriteLock but does not directly implement the interface
+ * so more sophisticated locking capabilities and logging/metrics are possible.
  */
-class FSNamesystemLock implements ReadWriteLock {
+class FSNamesystemLock {
   @VisibleForTesting
   protected ReentrantReadWriteLock coarseLock;
-  
-  FSNamesystemLock(boolean fair) {
+
+  private final Timer timer;
+
+  /**
+   * Log statements about long lock hold times will not be produced more
+   * frequently than this interval.
+   */
+  private final long lockSuppressWarningInterval;
+
+  /** Threshold (ms) for long holding write lock report. */
+  private final long writeLockReportingThreshold;
+  /** Last time stamp for write lock. Keep the longest one for multi-entrance.*/
+  private long writeLockHeldTimeStamp;
+  private int numWriteLockWarningsSuppressed = 0;
+  private long timeStampOfLastWriteLockReport = 0;
+  private long longestWriteLockHeldInterval = 0;
+
+  /** Threshold (ms) for long holding read lock report. */
+  private final long readLockReportingThreshold;
+  /**
+   * Last time stamp for read lock. Keep the longest one for
+   * multi-entrance. This is ThreadLocal since there could be
+   * many read locks held simultaneously.
+   */
+  private final ThreadLocal<Long> readLockHeldTimeStamp =
+      new ThreadLocal<Long>() {
+        @Override
+        public Long initialValue() {
+          return Long.MAX_VALUE;
+        }
+      };
+  private final AtomicInteger numReadLockWarningsSuppressed =
+      new AtomicInteger(0);
+  private final AtomicLong timeStampOfLastReadLockReport = new AtomicLong(0);
+  private final AtomicLong longestReadLockHeldInterval = new AtomicLong(0);
+
+  FSNamesystemLock(Configuration conf) {
+    this(conf, new Timer());
+  }
+
+  @VisibleForTesting
+  FSNamesystemLock(Configuration conf, Timer timer) {
+    boolean fair = conf.getBoolean("dfs.namenode.fslock.fair", true);
+    FSNamesystem.LOG.info("fsLock is fair: " + fair);
     this.coarseLock = new ReentrantReadWriteLock(fair);
+    this.timer = timer;
+
+    this.writeLockReportingThreshold = conf.getLong(
+        DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_KEY,
+        DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_DEFAULT);
+    this.readLockReportingThreshold = conf.getLong(
+        DFS_NAMENODE_READ_LOCK_REPORTING_THRESHOLD_MS_KEY,
+        DFS_NAMENODE_READ_LOCK_REPORTING_THRESHOLD_MS_DEFAULT);
+    this.lockSuppressWarningInterval = conf.getTimeDuration(
+        DFS_LOCK_SUPPRESS_WARNING_INTERVAL_KEY,
+        DFS_LOCK_SUPPRESS_WARNING_INTERVAL_DEFAULT, TimeUnit.MILLISECONDS);
   }
-  
-  @Override
-  public Lock readLock() {
-    return coarseLock.readLock();
+
+  public void readLock() {
+    coarseLock.readLock().lock();
+    if (coarseLock.getReadHoldCount() == 1) {
+      readLockHeldTimeStamp.set(timer.monotonicNow());
+    }
+  }
+
+  public void readUnlock() {
+    final boolean needReport = coarseLock.getReadHoldCount() == 1;
+    final long readLockInterval =
+        timer.monotonicNow() - readLockHeldTimeStamp.get();
+    coarseLock.readLock().unlock();
+
+    if (needReport) {
+      readLockHeldTimeStamp.remove();
+    }
+    if (needReport && readLockInterval >= this.readLockReportingThreshold) {
+      long localLongestReadLock;
+      do {
+        localLongestReadLock = longestReadLockHeldInterval.get();
+      } while (localLongestReadLock - readLockInterval < 0 &&
+          !longestReadLockHeldInterval.compareAndSet(localLongestReadLock,
+              readLockInterval));
+
+      long localTimeStampOfLastReadLockReport;
+      long now;
+      do {
+        now = timer.monotonicNow();
+        localTimeStampOfLastReadLockReport =
+            timeStampOfLastReadLockReport.get();
+        if (now - localTimeStampOfLastReadLockReport <
+            lockSuppressWarningInterval) {
+          numReadLockWarningsSuppressed.incrementAndGet();
+          return;
+        }
+      } while (!timeStampOfLastReadLockReport.compareAndSet(
+          localTimeStampOfLastReadLockReport, now));
+      int numSuppressedWarnings = numReadLockWarningsSuppressed.getAndSet(0);
+      long longestLockHeldInterval = longestReadLockHeldInterval.getAndSet(0);
+      FSNamesystem.LOG.info("FSNamesystem read lock held for " +
+          readLockInterval + " ms via\n" +
+          StringUtils.getStackTrace(Thread.currentThread()) +
+          "\tNumber of suppressed read-lock reports: " + numSuppressedWarnings +
+          "\n\tLongest read-lock held interval: " + longestLockHeldInterval);
+    }
   }
   
-  @Override
-  public Lock writeLock() {
-    return coarseLock.writeLock();
+  public void writeLock() {
+    coarseLock.writeLock().lock();
+    if (coarseLock.getWriteHoldCount() == 1) {
+      writeLockHeldTimeStamp = timer.monotonicNow();
+    }
+  }
+
+  public void writeLockInterruptibly() throws InterruptedException {
+    coarseLock.writeLock().lockInterruptibly();
+    if (coarseLock.getWriteHoldCount() == 1) {
+      writeLockHeldTimeStamp = timer.monotonicNow();
+    }
+  }
+
+  public void writeUnlock() {
+    final boolean needReport = coarseLock.getWriteHoldCount() == 1 &&
+        coarseLock.isWriteLockedByCurrentThread();
+    final long currentTime = timer.monotonicNow();
+    final long writeLockInterval = currentTime - writeLockHeldTimeStamp;
+
+    boolean logReport = false;
+    int numSuppressedWarnings = 0;
+    long longestLockHeldInterval = 0;
+    if (needReport && writeLockInterval >= this.writeLockReportingThreshold) {
+      if (writeLockInterval > longestWriteLockHeldInterval) {
+        longestWriteLockHeldInterval = writeLockInterval;
+      }
+      if (currentTime - timeStampOfLastWriteLockReport >
+          this.lockSuppressWarningInterval) {
+        logReport = true;
+        numSuppressedWarnings = numWriteLockWarningsSuppressed;
+        numWriteLockWarningsSuppressed = 0;
+        longestLockHeldInterval = longestWriteLockHeldInterval;
+        longestWriteLockHeldInterval = 0;
+        timeStampOfLastWriteLockReport = currentTime;
+      } else {
+        numWriteLockWarningsSuppressed++;
+      }
+    }
+
+    coarseLock.writeLock().unlock();
+
+    if (logReport) {
+      FSNamesystem.LOG.info("FSNamesystem write lock held for " +
+          writeLockInterval + " ms via\n" +
+          StringUtils.getStackTrace(Thread.currentThread()) +
+          "\tNumber of suppressed write-lock reports: " +
+          numSuppressedWarnings + "\n\tLongest write-lock held interval: " +
+          longestLockHeldInterval);
+    }
   }
 
   public int getReadHoldCount() {
@@ -60,6 +213,10 @@ class FSNamesystemLock implements ReadWriteLock {
     return coarseLock.isWriteLockedByCurrentThread();
   }
 
+  public Condition newWriteLockCondition() {
+    return coarseLock.writeLock().newCondition();
+  }
+
   /**
    * Returns the QueueLength of waiting threads.
    *

http://git-wip-us.apache.org/repos/asf/hadoop/blob/434c5ea7/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
index 47d549b..f02c679 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
@@ -20,7 +20,6 @@ package org.apache.hadoop.hdfs.server.namenode;
 
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_NAME_DIR_KEY;
-import org.apache.hadoop.util.FakeTimer;
 import static org.hamcrest.CoreMatchers.either;
 import static org.hamcrest.CoreMatchers.instanceOf;
 import static org.junit.Assert.*;
@@ -31,7 +30,6 @@ import java.net.InetAddress;
 import java.net.URI;
 import java.util.Collection;
 
-import com.google.common.base.Supplier;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileStatus;
 import org.apache.hadoop.fs.FileUtil;
@@ -45,22 +43,12 @@ import org.apache.hadoop.hdfs.server.namenode.ha.HAContext;
 import org.apache.hadoop.hdfs.server.namenode.ha.HAState;
 import org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot;
 import org.apache.hadoop.hdfs.server.namenode.top.TopAuditLogger;
-import org.apache.hadoop.test.GenericTestUtils;
-import org.apache.hadoop.test.GenericTestUtils.LogCapturer;
-import org.apache.log4j.Level;
 import org.junit.After;
-import org.junit.Assert;
 import org.junit.Test;
 import org.mockito.Mockito;
 import org.mockito.internal.util.reflection.Whitebox;
 
 import java.util.List;
-import java.util.concurrent.CountDownLatch;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Executors;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.TimeoutException;
-import java.util.regex.Pattern;
 
 public class TestFSNamesystem {
 
@@ -165,59 +153,6 @@ public class TestFSNamesystem {
     assertTrue("Replication queues weren't being populated after entering "
       + "safemode 2nd time", bm.isPopulatingReplQueues());
   }
-  
-  @Test
-  public void testFsLockFairness() throws IOException, InterruptedException{
-    Configuration conf = new Configuration();
-
-    FSEditLog fsEditLog = Mockito.mock(FSEditLog.class);
-    FSImage fsImage = Mockito.mock(FSImage.class);
-    Mockito.when(fsImage.getEditLog()).thenReturn(fsEditLog);
-
-    conf.setBoolean("dfs.namenode.fslock.fair", true);
-    FSNamesystem fsNamesystem = new FSNamesystem(conf, fsImage);
-    assertTrue(fsNamesystem.getFsLockForTests().isFair());
-    
-    conf.setBoolean("dfs.namenode.fslock.fair", false);
-    fsNamesystem = new FSNamesystem(conf, fsImage);
-    assertFalse(fsNamesystem.getFsLockForTests().isFair());
-  }  
-  
-  @Test
-  public void testFSNamesystemLockCompatibility() {
-    FSNamesystemLock rwLock = new FSNamesystemLock(true);
-
-    assertEquals(0, rwLock.getReadHoldCount());
-    rwLock.readLock().lock();
-    assertEquals(1, rwLock.getReadHoldCount());
-
-    rwLock.readLock().lock();
-    assertEquals(2, rwLock.getReadHoldCount());
-
-    rwLock.readLock().unlock();
-    assertEquals(1, rwLock.getReadHoldCount());
-
-    rwLock.readLock().unlock();
-    assertEquals(0, rwLock.getReadHoldCount());
-
-    assertFalse(rwLock.isWriteLockedByCurrentThread());
-    assertEquals(0, rwLock.getWriteHoldCount());
-    rwLock.writeLock().lock();
-    assertTrue(rwLock.isWriteLockedByCurrentThread());
-    assertEquals(1, rwLock.getWriteHoldCount());
-    
-    rwLock.writeLock().lock();
-    assertTrue(rwLock.isWriteLockedByCurrentThread());
-    assertEquals(2, rwLock.getWriteHoldCount());
-
-    rwLock.writeLock().unlock();
-    assertTrue(rwLock.isWriteLockedByCurrentThread());
-    assertEquals(1, rwLock.getWriteHoldCount());
-
-    rwLock.writeLock().unlock();
-    assertFalse(rwLock.isWriteLockedByCurrentThread());
-    assertEquals(0, rwLock.getWriteHoldCount());
-  }
 
   @Test
   public void testReset() throws Exception {
@@ -258,233 +193,6 @@ public class TestFSNamesystem {
   }
 
   @Test
-  public void testFSLockGetWaiterCount() throws InterruptedException {
-    final int threadCount = 3;
-    final CountDownLatch latch = new CountDownLatch(threadCount);
-    final FSNamesystemLock rwLock = new FSNamesystemLock(true);
-    rwLock.writeLock().lock();
-    ExecutorService helper = Executors.newFixedThreadPool(threadCount);
-
-    for (int x = 0; x < threadCount; x++) {
-      helper.execute(new Runnable() {
-        @Override
-        public void run() {
-          latch.countDown();
-          rwLock.readLock().lock();
-        }
-      });
-    }
-
-    latch.await();
-    try {
-      GenericTestUtils.waitFor(new Supplier<Boolean>() {
-        @Override
-        public Boolean get() {
-          return (threadCount == rwLock.getQueueLength());
-        }
-      }, 10, 1000);
-    } catch (TimeoutException e) {
-      fail("Expected number of blocked thread not found");
-    }
-  }
-
-  /**
-   * Test when FSNamesystem write lock is held for a long time,
-   * logger will report it.
-   */
-  @Test(timeout=45000)
-  public void testFSWriteLockLongHoldingReport() throws Exception {
-    final long writeLockReportingThreshold = 100L;
-    final long writeLockSuppressWarningInterval = 10000L;
-    Configuration conf = new Configuration();
-    conf.setLong(DFSConfigKeys.DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_KEY,
-        writeLockReportingThreshold);
-    conf.setTimeDuration(DFSConfigKeys.DFS_LOCK_SUPPRESS_WARNING_INTERVAL_KEY,
-        writeLockSuppressWarningInterval, TimeUnit.MILLISECONDS);
-    FSImage fsImage = Mockito.mock(FSImage.class);
-    FSEditLog fsEditLog = Mockito.mock(FSEditLog.class);
-    Mockito.when(fsImage.getEditLog()).thenReturn(fsEditLog);
-    FSNamesystem fsn = new FSNamesystem(conf, fsImage);
-
-    FakeTimer timer = new FakeTimer();
-    fsn.setTimer(timer);
-    timer.advance(writeLockSuppressWarningInterval);
-
-    LogCapturer logs = LogCapturer.captureLogs(FSNamesystem.LOG);
-    GenericTestUtils.setLogLevel(FSNamesystem.LOG, Level.INFO);
-
-    // Don't report if the write lock is held for a short time
-    fsn.writeLock();
-    fsn.writeUnlock();
-    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()));
-
-    // Report the first write lock warning if it is held for a long time
-    fsn.writeLock();
-    timer.advance(writeLockReportingThreshold + 10);
-    logs.clearOutput();
-    fsn.writeUnlock();
-    assertTrue(logs.getOutput().contains(GenericTestUtils.getMethodName()));
-
-    // Track but do not Report if the write lock is held (interruptibly) for
-    // a long time but time since last report does not exceed the suppress
-    // warning interval
-    fsn.writeLockInterruptibly();
-    timer.advance(writeLockReportingThreshold + 10);
-    logs.clearOutput();
-    fsn.writeUnlock();
-    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()));
-
-    // Track but do not Report if it's held for a long time when re-entering
-    // write lock but time since last report does not exceed the suppress
-    // warning interval
-    fsn.writeLock();
-    timer.advance(writeLockReportingThreshold/ 2 + 1);
-    fsn.writeLockInterruptibly();
-    timer.advance(writeLockReportingThreshold/ 2 + 1);
-    fsn.writeLock();
-    timer.advance(writeLockReportingThreshold/ 2);
-    logs.clearOutput();
-    fsn.writeUnlock();
-    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()));
-    logs.clearOutput();
-    fsn.writeUnlock();
-    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()));
-    logs.clearOutput();
-    fsn.writeUnlock();
-    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()));
-
-    // Report if it's held for a long time and time since last report exceeds
-    // the supress warning interval
-    timer.advance(writeLockSuppressWarningInterval);
-    fsn.writeLock();
-    timer.advance(writeLockReportingThreshold + 100);
-    logs.clearOutput();
-    fsn.writeUnlock();
-    assertTrue(logs.getOutput().contains(GenericTestUtils.getMethodName()));
-    assertTrue(logs.getOutput().contains("Number of suppressed write-lock " +
-        "reports: 2"));
-  }
-
-  /**
-   * Test when FSNamesystem read lock is held for a long time,
-   * logger will report it.
-   */
-  @Test(timeout=45000)
-  public void testFSReadLockLongHoldingReport() throws Exception {
-    final long readLockReportingThreshold = 100L;
-    final long readLockSuppressWarningInterval = 10000L;
-    final String readLockLogStmt = "FSNamesystem read lock held for ";
-    Configuration conf = new Configuration();
-    conf.setLong(
-        DFSConfigKeys.DFS_NAMENODE_READ_LOCK_REPORTING_THRESHOLD_MS_KEY,
-        readLockReportingThreshold);
-    conf.setTimeDuration(DFSConfigKeys.DFS_LOCK_SUPPRESS_WARNING_INTERVAL_KEY,
-        readLockSuppressWarningInterval, TimeUnit.MILLISECONDS);
-    FSImage fsImage = Mockito.mock(FSImage.class);
-    FSEditLog fsEditLog = Mockito.mock(FSEditLog.class);
-    Mockito.when(fsImage.getEditLog()).thenReturn(fsEditLog);
-    FSNamesystem fsn = new FSNamesystem(conf, fsImage);
-
-    FakeTimer timer = new FakeTimer();
-    fsn.setTimer(timer);
-    timer.advance(readLockSuppressWarningInterval);
-
-    LogCapturer logs = LogCapturer.captureLogs(FSNamesystem.LOG);
-    GenericTestUtils.setLogLevel(FSNamesystem.LOG, Level.INFO);
-
-    // Don't report if the read lock is held for a short time
-    fsn.readLock();
-    fsn.readUnlock();
-    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()) &&
-        logs.getOutput().contains(readLockLogStmt));
-
-    // Report the first read lock warning if it is held for a long time
-    fsn.readLock();
-    timer.advance(readLockReportingThreshold + 10);
-    logs.clearOutput();
-    fsn.readUnlock();
-    assertTrue(logs.getOutput().contains(GenericTestUtils.getMethodName())
-        && logs.getOutput().contains(readLockLogStmt));
-
-    // Track but do not Report if the write lock is held for a long time but
-    // time since last report does not exceed the suppress warning interval
-    fsn.readLock();
-    timer.advance(readLockReportingThreshold + 10);
-    logs.clearOutput();
-    fsn.readUnlock();
-    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName())
-        && logs.getOutput().contains(readLockLogStmt));
-
-    // Track but do not Report if it's held for a long time when re-entering
-    // read lock but time since last report does not exceed the suppress
-    // warning interval
-    fsn.readLock();
-    timer.advance(readLockReportingThreshold / 2 + 1);
-    fsn.readLock();
-    timer.advance(readLockReportingThreshold / 2 + 1);
-    logs.clearOutput();
-    fsn.readUnlock();
-    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()) ||
-        logs.getOutput().contains(readLockLogStmt));
-    logs.clearOutput();
-    fsn.readUnlock();
-    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()) &&
-        logs.getOutput().contains(readLockLogStmt));
-
-    // Report if it's held for a long time (and time since last report
-    // exceeds the suppress warning interval) while another thread also has the
-    // read lock. Let one thread hold the lock long enough to activate an
-    // alert, then have another thread grab the read lock to ensure that this
-    // doesn't reset the timing.
-    timer.advance(readLockSuppressWarningInterval);
-    logs.clearOutput();
-    CountDownLatch barrier = new CountDownLatch(1);
-    CountDownLatch barrier2 = new CountDownLatch(1);
-    Thread t1 = new Thread() {
-      @Override
-      public void run() {
-        try {
-          fsn.readLock();
-          timer.advance(readLockReportingThreshold + 1);
-          barrier.countDown(); // Allow for t2 to acquire the read lock
-          barrier2.await(); // Wait until t2 has the read lock
-          fsn.readUnlock();
-        } catch (InterruptedException e) {
-          fail("Interrupted during testing");
-        }
-      }
-    };
-    Thread t2 = new Thread() {
-      @Override
-      public void run() {
-        try {
-          barrier.await(); // Wait until t1 finishes sleeping
-          fsn.readLock();
-          barrier2.countDown(); // Allow for t1 to unlock
-          fsn.readUnlock();
-        } catch (InterruptedException e) {
-          fail("Interrupted during testing");
-        }
-      }
-    };
-    t1.start();
-    t2.start();
-    t1.join();
-    t2.join();
-    // Look for the differentiating class names in the stack trace
-    String stackTracePatternString =
-        String.format("INFO.+%s(.+\n){4}\\Q%%s\\E\\.run", readLockLogStmt);
-    Pattern t1Pattern = Pattern.compile(
-        String.format(stackTracePatternString, t1.getClass().getName()));
-    assertTrue(t1Pattern.matcher(logs.getOutput()).find());
-    Pattern t2Pattern = Pattern.compile(
-        String.format(stackTracePatternString, t2.getClass().getName()));
-    assertFalse(t2Pattern.matcher(logs.getOutput()).find());
-    assertTrue(logs.getOutput().contains("Number of suppressed read-lock " +
-        "reports: 2"));
-  }
-
-  @Test
   public void testSafemodeReplicationConf() throws IOException {
     Configuration conf = new Configuration();
     FSImage fsImage = Mockito.mock(FSImage.class);

http://git-wip-us.apache.org/repos/asf/hadoop/blob/434c5ea7/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystemLock.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystemLock.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystemLock.java
new file mode 100644
index 0000000..08900ec
--- /dev/null
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystemLock.java
@@ -0,0 +1,317 @@
+/**
+ * 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.hadoop.hdfs.server.namenode;
+
+import com.google.common.base.Supplier;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdfs.DFSConfigKeys;
+import org.apache.hadoop.test.GenericTestUtils;
+import org.apache.hadoop.test.GenericTestUtils.LogCapturer;
+import org.apache.hadoop.util.FakeTimer;
+import org.apache.log4j.Level;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import java.util.regex.Pattern;
+
+import static org.junit.Assert.*;
+
+/**
+ * Tests the FSNamesystemLock, looking at lock compatibilities and
+ * proper logging of lock hold times.
+ */
+public class TestFSNamesystemLock {
+
+  @Test
+  public void testFsLockFairness() throws IOException, InterruptedException{
+    Configuration conf = new Configuration();
+
+    conf.setBoolean("dfs.namenode.fslock.fair", true);
+    FSNamesystemLock fsnLock = new FSNamesystemLock(conf);
+    assertTrue(fsnLock.coarseLock.isFair());
+
+    conf.setBoolean("dfs.namenode.fslock.fair", false);
+    fsnLock = new FSNamesystemLock(conf);
+    assertFalse(fsnLock.coarseLock.isFair());
+  }
+
+  @Test
+  public void testFSNamesystemLockCompatibility() {
+    FSNamesystemLock rwLock = new FSNamesystemLock(new Configuration());
+
+    assertEquals(0, rwLock.getReadHoldCount());
+    rwLock.readLock();
+    assertEquals(1, rwLock.getReadHoldCount());
+
+    rwLock.readLock();
+    assertEquals(2, rwLock.getReadHoldCount());
+
+    rwLock.readUnlock();
+    assertEquals(1, rwLock.getReadHoldCount());
+
+    rwLock.readUnlock();
+    assertEquals(0, rwLock.getReadHoldCount());
+
+    assertFalse(rwLock.isWriteLockedByCurrentThread());
+    assertEquals(0, rwLock.getWriteHoldCount());
+    rwLock.writeLock();
+    assertTrue(rwLock.isWriteLockedByCurrentThread());
+    assertEquals(1, rwLock.getWriteHoldCount());
+
+    rwLock.writeLock();
+    assertTrue(rwLock.isWriteLockedByCurrentThread());
+    assertEquals(2, rwLock.getWriteHoldCount());
+
+    rwLock.writeUnlock();
+    assertTrue(rwLock.isWriteLockedByCurrentThread());
+    assertEquals(1, rwLock.getWriteHoldCount());
+
+    rwLock.writeUnlock();
+    assertFalse(rwLock.isWriteLockedByCurrentThread());
+    assertEquals(0, rwLock.getWriteHoldCount());
+  }
+
+  @Test
+  public void testFSLockGetWaiterCount() throws InterruptedException {
+    final int threadCount = 3;
+    final CountDownLatch latch = new CountDownLatch(threadCount);
+    final Configuration conf = new Configuration();
+    conf.setBoolean("dfs.namenode.fslock.fair", true);
+    final FSNamesystemLock rwLock = new FSNamesystemLock(conf);
+    rwLock.writeLock();
+    ExecutorService helper = Executors.newFixedThreadPool(threadCount);
+
+    for (int x = 0; x < threadCount; x++) {
+      helper.execute(new Runnable() {
+        @Override
+        public void run() {
+          latch.countDown();
+          rwLock.readLock();
+        }
+      });
+    }
+
+    latch.await();
+    try {
+      GenericTestUtils.waitFor(new Supplier<Boolean>() {
+        @Override
+        public Boolean get() {
+          return (threadCount == rwLock.getQueueLength());
+        }
+      }, 10, 1000);
+    } catch (TimeoutException e) {
+      fail("Expected number of blocked thread not found");
+    }
+  }
+
+  /**
+   * Test when FSNamesystem write lock is held for a long time,
+   * logger will report it.
+   */
+  @Test(timeout=45000)
+  public void testFSWriteLockLongHoldingReport() throws Exception {
+    final long writeLockReportingThreshold = 100L;
+    final long writeLockSuppressWarningInterval = 10000L;
+    Configuration conf = new Configuration();
+    conf.setLong(
+        DFSConfigKeys.DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_KEY,
+        writeLockReportingThreshold);
+    conf.setTimeDuration(DFSConfigKeys.DFS_LOCK_SUPPRESS_WARNING_INTERVAL_KEY,
+        writeLockSuppressWarningInterval, TimeUnit.MILLISECONDS);
+
+    final FakeTimer timer = new FakeTimer();
+    final FSNamesystemLock fsnLock = new FSNamesystemLock(conf, timer);
+    timer.advance(writeLockSuppressWarningInterval);
+
+    LogCapturer logs = LogCapturer.captureLogs(FSNamesystem.LOG);
+    GenericTestUtils.setLogLevel(FSNamesystem.LOG, Level.INFO);
+
+    // Don't report if the write lock is held for a short time
+    fsnLock.writeLock();
+    fsnLock.writeUnlock();
+    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()));
+
+    // Report if the write lock is held for a long time
+    fsnLock.writeLock();
+    timer.advance(writeLockReportingThreshold + 10);
+    logs.clearOutput();
+    fsnLock.writeUnlock();
+    assertTrue(logs.getOutput().contains(GenericTestUtils.getMethodName()));
+
+    // Track but do not report if the write lock is held (interruptibly) for
+    // a long time but time since last report does not exceed the suppress
+    // warning interval
+    fsnLock.writeLockInterruptibly();
+    timer.advance(writeLockReportingThreshold + 10);
+    logs.clearOutput();
+    fsnLock.writeUnlock();
+    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()));
+
+    // Track but do not report if it's held for a long time when re-entering
+    // write lock but time since last report does not exceed the suppress
+    // warning interval
+    fsnLock.writeLock();
+    timer.advance(writeLockReportingThreshold / 2 + 1);
+    fsnLock.writeLockInterruptibly();
+    timer.advance(writeLockReportingThreshold / 2 + 1);
+    fsnLock.writeLock();
+    timer.advance(writeLockReportingThreshold / 2);
+    logs.clearOutput();
+    fsnLock.writeUnlock();
+    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()));
+    logs.clearOutput();
+    fsnLock.writeUnlock();
+    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()));
+    logs.clearOutput();
+    fsnLock.writeUnlock();
+    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()));
+
+    // Report if it's held for a long time and time since last report exceeds
+    // the supress warning interval
+    timer.advance(writeLockSuppressWarningInterval);
+    fsnLock.writeLock();
+    timer.advance(writeLockReportingThreshold + 100);
+    logs.clearOutput();
+    fsnLock.writeUnlock();
+    assertTrue(logs.getOutput().contains(GenericTestUtils.getMethodName()));
+    assertTrue(logs.getOutput().contains(
+        "Number of suppressed write-lock reports: 2"));
+  }
+
+  /**
+   * Test when FSNamesystem read lock is held for a long time,
+   * logger will report it.
+   */
+  @Test(timeout=45000)
+  public void testFSReadLockLongHoldingReport() throws Exception {
+    final long readLockReportingThreshold = 100L;
+    final long readLockSuppressWarningInterval = 10000L;
+    final String readLockLogStmt = "FSNamesystem read lock held for ";
+    Configuration conf = new Configuration();
+    conf.setLong(
+        DFSConfigKeys.DFS_NAMENODE_READ_LOCK_REPORTING_THRESHOLD_MS_KEY,
+        readLockReportingThreshold);
+    conf.setTimeDuration(DFSConfigKeys.DFS_LOCK_SUPPRESS_WARNING_INTERVAL_KEY,
+        readLockSuppressWarningInterval, TimeUnit.MILLISECONDS);
+
+    final FakeTimer timer = new FakeTimer();
+    final FSNamesystemLock fsnLock = new FSNamesystemLock(conf, timer);
+    timer.advance(readLockSuppressWarningInterval);
+
+    LogCapturer logs = LogCapturer.captureLogs(FSNamesystem.LOG);
+    GenericTestUtils.setLogLevel(FSNamesystem.LOG, Level.INFO);
+
+    // Don't report if the read lock is held for a short time
+    fsnLock.readLock();
+    fsnLock.readUnlock();
+    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()) &&
+        logs.getOutput().contains(readLockLogStmt));
+
+    // Report the first read lock warning if it is held for a long time
+    fsnLock.readLock();
+    timer.advance(readLockReportingThreshold + 10);
+    logs.clearOutput();
+    fsnLock.readUnlock();
+    assertTrue(logs.getOutput().contains(GenericTestUtils.getMethodName()) &&
+        logs.getOutput().contains(readLockLogStmt));
+
+    // Track but do not Report if the write lock is held for a long time but
+    // time since last report does not exceed the suppress warning interval
+    fsnLock.readLock();
+    timer.advance(readLockReportingThreshold + 10);
+    logs.clearOutput();
+    fsnLock.readUnlock();
+    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()) &&
+        logs.getOutput().contains(readLockLogStmt));
+
+    // Track but do not Report if it's held for a long time when re-entering
+    // read lock but time since last report does not exceed the suppress
+    // warning interval
+    fsnLock.readLock();
+    timer.advance(readLockReportingThreshold / 2 + 1);
+    fsnLock.readLock();
+    timer.advance(readLockReportingThreshold / 2 + 1);
+    logs.clearOutput();
+    fsnLock.readUnlock();
+    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()) ||
+        logs.getOutput().contains(readLockLogStmt));
+    logs.clearOutput();
+    fsnLock.readUnlock();
+    assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()) &&
+        logs.getOutput().contains(readLockLogStmt));
+
+    // Report if it's held for a long time (and time since last report
+    // exceeds the suppress warning interval) while another thread also has the
+    // read lock. Let one thread hold the lock long enough to activate an
+    // alert, then have another thread grab the read lock to ensure that this
+    // doesn't reset the timing.
+    timer.advance(readLockSuppressWarningInterval);
+    logs.clearOutput();
+    final CountDownLatch barrier = new CountDownLatch(1);
+    final CountDownLatch barrier2 = new CountDownLatch(1);
+    Thread t1 = new Thread() {
+      @Override
+      public void run() {
+        try {
+          fsnLock.readLock();
+          timer.advance(readLockReportingThreshold + 1);
+          barrier.countDown(); // Allow for t2 to acquire the read lock
+          barrier2.await(); // Wait until t2 has the read lock
+          fsnLock.readUnlock();
+        } catch (InterruptedException e) {
+          fail("Interrupted during testing");
+        }
+      }
+    };
+    Thread t2 = new Thread() {
+      @Override
+      public void run() {
+        try {
+          barrier.await(); // Wait until t1 finishes sleeping
+          fsnLock.readLock();
+          barrier2.countDown(); // Allow for t1 to unlock
+          fsnLock.readUnlock();
+        } catch (InterruptedException e) {
+          fail("Interrupted during testing");
+        }
+      }
+    };
+    t1.start();
+    t2.start();
+    t1.join();
+    t2.join();
+    // Look for the differentiating class names in the stack trace
+    String stackTracePatternString =
+        String.format("INFO.+%s(.+\n){4}\\Q%%s\\E\\.run", readLockLogStmt);
+    Pattern t1Pattern = Pattern.compile(
+        String.format(stackTracePatternString, t1.getClass().getName()));
+    assertTrue(t1Pattern.matcher(logs.getOutput()).find());
+    Pattern t2Pattern = Pattern.compile(
+        String.format(stackTracePatternString, t2.getClass().getName()));
+    assertFalse(t2Pattern.matcher(logs.getOutput()).find());
+    assertTrue(logs.getOutput().contains(
+        "Number of suppressed read-lock reports: 2"));
+  }
+
+}
\ No newline at end of file


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