Preparing for release 0.19.2

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.19@789657 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -1,6 +1,6 @@
 Hadoop Change Log
 
-Release 0.19.2 - Unreleased
+Release 0.19.2 - 2009-06-30
 
   BUG FIXES
 

build.xml

@@ -26,7 +26,7 @@
  
   <property name="Name" value="Hadoop"/>
   <property name="name" value="hadoop"/>
-  <property name="version" value="0.19.2-dev"/>
+  <property name="version" value="0.19.3-dev"/>
   <property name="final.name" value="${name}-${version}"/>
   <property name="year" value="2008"/>
   <property name="libhdfs.version" value="1"/>

docs/changes.html

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@@ -52,31 +52,98 @@
 <a href="http://hadoop.apache.org/core/"><img class="logoImage" alt="Hadoop" src="images/hadoop-logo.jpg" title="Scalable Computing Platform"></a>
 <h1>Hadoop Change Log</h1>
 
-<h2><a href="javascript:toggleList('release_0.19.1_-_2009-02-23_')">Release 0.19.1 - 2009-02-23
+<h2><a href="javascript:toggleList('release_0.19.2_-_2009-06-30_')">Release 0.19.2 - 2009-06-30
 </a></h2>
-<ul id="release_0.19.1_-_2009-02-23_">
-  <li><a href="javascript:toggleList('release_0.19.1_-_2009-02-23_._incompatible_changes_')">  INCOMPATIBLE CHANGES
-</a>&nbsp;&nbsp;&nbsp;(2)
-    <ol id="release_0.19.1_-_2009-02-23_._incompatible_changes_">
+<ul id="release_0.19.2_-_2009-06-30_">
+  <li><a href="javascript:toggleList('release_0.19.2_-_2009-06-30_._bug_fixes_')">  BUG FIXES
+</a>&nbsp;&nbsp;&nbsp;(36)
+    <ol id="release_0.19.2_-_2009-06-30_._bug_fixes_">
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5379">HADOOP-5379</a>. CBZip2InputStream to throw IOException on data crc error.<br />(Rodrigo Schmidt via zshao)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5326">HADOOP-5326</a>. Fixes CBZip2OutputStream data corruption problem.<br />(Rodrigo Schmidt via zshao)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5154">HADOOP-5154</a>. Fixes a deadlock in the fairshare scheduler.<br />(Matei Zaharia via yhemanth)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5269">HADOOP-5269</a>. Fixes a problem to do with tasktracker holding on to FAILED_UNCLEAN
+or KILLED_UNCLEAN tasks forever.<br />(Amareshwari Sriramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5280">HADOOP-5280</a>. Adds a check to prevent a task state transition from FAILED to
+any of UNASSIGNED, RUNNING, COMMIT_PENDING or SUCCEEDED.<br />(ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5241">HADOOP-5241</a>. Fixes a bug in disk-space resource estimation. Makes the estimation
+formula linear where blowUp = Total-Output/Total-Input.<br />(Sharad Agarwal via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5233">HADOOP-5233</a>. Addresses the three issues - Race condition in updating
+status, NPE in TaskTracker task localization when the conf file is missing
+(<a href="http://issues.apache.org/jira/browse/HADOOP-5234">HADOOP-5234</a>) and NPE in handling KillTaskAction of a cleanup task (<a href="http://issues.apache.org/jira/browse/HADOOP-5235">HADOOP-5235</a>).<br />(Amareshwari Sriramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5247">HADOOP-5247</a>. Introduces a broadcast of KillJobAction to all trackers when
+a job finishes. This fixes a bunch of problems to do with NPE when a completed
+job is not in memory and a tasktracker comes to the jobtracker with a status
+report of a task belonging to that job.<br />(Amar Kamat via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5146">HADOOP-5146</a>. Fixes a race condition that causes LocalDirAllocator to miss
+files.<br />(Devaraj Das via yhemanth)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-4638">HADOOP-4638</a>. Fixes job recovery to not crash the job tracker for problems
+with a single job file.<br />(Amar Kamat via yhemanth)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5384">HADOOP-5384</a>. Fix a problem that DataNodeCluster creates blocks with
+generationStamp == 1.<br />(szetszwo)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5376">HADOOP-5376</a>. Fixes the code handling lost tasktrackers to set the task state
+to KILLED_UNCLEAN only for relevant type of tasks.<br />(Amareshwari Sriramadasu via yhemanth)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5285">HADOOP-5285</a>. Fixes the issues - (1) obtainTaskCleanupTask checks whether job is
+inited before trying to lock the JobInProgress (2) Moves the CleanupQueue class
+outside the TaskTracker and makes it a generic class that is used by the
+JobTracker also for deleting the paths on the job's output fs. (3) Moves the
+references to completedJobStore outside the block where the JobTracker is locked.<br />(ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5392">HADOOP-5392</a>. Fixes a problem to do with JT crashing during recovery when
+the job files are garbled.<br />(Amar Kamat vi ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5421">HADOOP-5421</a>. Removes the test TestRecoveryManager.java from the 0.19 branch
+as it has compilation issues.<br />(ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5332">HADOOP-5332</a>. Appending to files is not allowed (by default) unless
+dfs.support.append is set to true.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5333">HADOOP-5333</a>. libhdfs supports appending to files.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-3998">HADOOP-3998</a>. Fix dfsclient exception when JVM is shutdown.<br />(dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5440">HADOOP-5440</a>. Fixes a problem to do with removing a taskId from the list
+of taskIds that the TaskTracker's TaskMemoryManager manages.<br />(Amareshwari Sriramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5446">HADOOP-5446</a>. Restore TaskTracker metrics.<br />(cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5449">HADOOP-5449</a>. Fixes the history cleaner thread.<br />(Amareshwari Sriramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5479">HADOOP-5479</a>. NameNode should not send empty block replication request to
+DataNode.<br />(hairong)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5522">HADOOP-5522</a>. Documents the setup/cleanup tasks in the mapred tutorial.<br />(Amareshwari Sriramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5549">HADOOP-5549</a>. ReplicationMonitor should schedule both replication and
+deletion work in one iteration.<br />(hairong)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5554">HADOOP-5554</a>. DataNodeCluster and CreateEditsLog should create blocks with
+the same generation stamp value.<br />(hairong via szetszwo)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5231">HADOOP-5231</a>. Clones the TaskStatus before passing it to the JobInProgress.<br />(Amareshwari Sriramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-4719">HADOOP-4719</a>. Fix documentation of 'ls' format for FsShell.<br />(Ravi Phulari
+via cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5374">HADOOP-5374</a>. Fixes a NPE problem in getTasksToSave method.<br />(Amareshwari Sriramadasu via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-4780">HADOOP-4780</a>. Cache the size of directories in DistributedCache, avoiding
+long delays in recalculating it.<br />(He Yongqiang via cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5551">HADOOP-5551</a>. Prevent directory destruction on file create.<br />(Brian Bockelman via shv)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5671">HADOOP-5671</a>. Fix FNF exceptions when copying from old versions of
+HftpFileSystem. (Tsz Wo (Nicholas), SZE via cdouglas)
+</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5213">HADOOP-5213</a>. Fix Null pointer exception caused when bzip2compression
+was used and user closed a output stream without writing any data.<br />(Zheng Shao via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5579">HADOOP-5579</a>. Set errno correctly in libhdfs for permission, quota, and FNF
+conditions.<br />(Brian Bockelman via cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5728">HADOOP-5728</a>. Fixed FSEditLog.printStatistics IndexOutOfBoundsException.<br />(Wang Xu via johan)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5816">HADOOP-5816</a>. Fixes a problem in the KeyFieldBasedComparator to do with
+ArrayIndexOutOfBounds exception.<br />(He Yongqiang via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5951">HADOOP-5951</a>. Add Apache license header to StorageInfo.java.<br />(Suresh
+Srinivas via szetszwo)</li>
+    </ol>
+  </li>
+</ul>
+<h2><a href="javascript:toggleList('release_0.19.1_-_2009-02-23_')">Release 0.19.1 - 2009-02-23 
+</a></h2>
+    <ul id="release_0.19.1_-_2009-02-23_">
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-5225">HADOOP-5225</a>. Workaround for tmp file handling in HDFS. sync() is
 incomplete as a result. committed only to 0.19.x.<br />(Raghu Angadi)</li>
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-5224">HADOOP-5224</a>. HDFS append() is disabled. It throws
 UnsupportedOperationException. committed only to 0.19.x<br />(Raghu Angadi)</li>
-    </ol>
-  </li>
-  <li><a href="javascript:toggleList('release_0.19.1_-_2009-02-23_._improvements_')">  IMPROVEMENTS
-</a>&nbsp;&nbsp;&nbsp;(4)
-    <ol id="release_0.19.1_-_2009-02-23_._improvements_">
+    </ul>
+    <ul id="release_0.19.1_-_2009-02-23_._improvements_">
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-4739">HADOOP-4739</a>. Fix spelling and grammar, improve phrasing of some sections in
 mapred tutorial.<br />(Vivek Ratan via cdouglas)</li>
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-3894">HADOOP-3894</a>. DFSClient logging improvements.<br />(Steve Loughran via shv)</li>
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-5126">HADOOP-5126</a>. Remove empty file BlocksWithLocations.java<br />(shv)</li>
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-5127">HADOOP-5127</a>. Remove public methods in FSDirectory.<br />(Jakob Homan via shv)</li>
-    </ol>
-  </li>
-  <li><a href="javascript:toggleList('release_0.19.1_-_2009-02-23_._bug_fixes_')">  BUG FIXES
-</a>&nbsp;&nbsp;&nbsp;(31)
-    <ol id="release_0.19.1_-_2009-02-23_._bug_fixes_">
+    </ul>
+    <ul id="release_0.19.1_-_2009-02-23_._bug_fixes_">
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-4697">HADOOP-4697</a>. Fix getBlockLocations in KosmosFileSystem to handle multiple
 blocks correctly.<br />(Sriram Rao via cdouglas)</li>
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-4420">HADOOP-4420</a>. Add null checks for job, caused by invalid job IDs.<br />(Aaron Kimball via tomwhite)</li>
@@ -130,11 +197,11 @@ for the JobTracker. (Amar Kamat via yhemanth).
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-5067">HADOOP-5067</a>. Fixes TaskInProgress.java to keep track of count of failed and
 killed tasks correctly.<br />(Amareshwari Sriramadasu via ddas)</li>
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-4760">HADOOP-4760</a>. HDFS streams should not throw exceptions when closed twice.<br />(enis)</li>
-    </ol>
-  </li>
-</ul>
-<h2><a href="javascript:toggleList('release_0.19.0_-_2008-11-18_')">Release 0.19.0 - 2008-11-18
-</a></h2>
+    </ul>
+<h2><a href="javascript:toggleList('older')">Older Releases</a></h2>
+<ul id="older">
+<h3><a href="javascript:toggleList('release_0.19.0_-_2008-11-18_')">Release 0.19.0 - 2008-11-18
+</a></h3>
 <ul id="release_0.19.0_-_2008-11-18_">
   <li><a href="javascript:toggleList('release_0.19.0_-_2008-11-18_._incompatible_changes_')">  INCOMPATIBLE CHANGES
 </a>&nbsp;&nbsp;&nbsp;(22)
@@ -757,13 +824,11 @@ path rather than the JobClient.<br />(Joydeep Sen Sarma via dhruba)</li>
     </ol>
   </li>
 </ul>
-<h2><a href="javascript:toggleList('older')">Older Releases</a></h2>
-<ul id="older">
 <h3><a href="javascript:toggleList('release_0.18.4_-_unreleased_')">Release 0.18.4 - Unreleased
 </a></h3>
 <ul id="release_0.18.4_-_unreleased_">
   <li><a href="javascript:toggleList('release_0.18.4_-_unreleased_._bug_fixes_')">  BUG FIXES
-</a>&nbsp;&nbsp;&nbsp;(3)
+</a>&nbsp;&nbsp;&nbsp;(8)
     <ol id="release_0.18.4_-_unreleased_._bug_fixes_">
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-5114">HADOOP-5114</a>. Remove timeout for accept() in DataNode. This makes accept()
 fail in JDK on Windows and causes many tests to fail.<br />(Raghu Angadi)</li>
@@ -771,6 +836,17 @@ fail in JDK on Windows and causes many tests to fail.<br />(Raghu Angadi)</li>
 being written by other threads.<br />(hairong)</li>
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-5134">HADOOP-5134</a>. FSNamesystem#commitBlockSynchronization adds under-construction
 block locations to blocksMap.<br />(Dhruba Borthakur via hairong)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5412">HADOOP-5412</a>. Simulated DataNode should not write to a block that's being
+written by another thread.<br />(hairong)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5465">HADOOP-5465</a>. Fix the problem of blocks remaining under-replicated by
+providing synchronized modification to the counter xmitsInProgress in
+DataNode.<br />(hairong)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5557">HADOOP-5557</a>. Fixes some minor problems in TestOverReplicatedBlocks.<br />(szetszwo)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-5644">HADOOP-5644</a>. Namnode is stuck in safe mode.<br />(Suresh Srinivas via hairong)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-6017">HADOOP-6017</a>. Lease Manager in NameNode does not handle certain characters
+in filenames. This results in fatal errors in Secondary NameNode and while
+restrating NameNode. (Tsz Wo (Nicholas), SZE via rangadi)
+</li>
     </ol>
   </li>
 </ul>

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@@ -2204,15 +2204,22 @@ document.write("Last Published: " + document.lastModified);
             Setup the job during initialization. For example, create
             the temporary output directory for the job during the
             initialization of the job. 
+            Job setup is done by a separate task when the job is
+            in PREP state and after initializing tasks. Once the setup task
+            completes, the job will be moved to RUNNING state.
           </li>
           
 <li>
             Cleanup the job after the job completion. For example, remove the
             temporary output directory after the job completion.
+            Job cleanup is done by a separate task at the end of the job.
+            Job is declared SUCCEDED/FAILED/KILLED after the cleanup
+            task completes.
           </li>
           
 <li>
             Setup the task temporary output.
+            Task setup is done as part of the same task, during task initialization.
           </li> 
           
 <li>
@@ -2222,16 +2229,23 @@ document.write("Last Published: " + document.lastModified);
           
 <li>
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+            Once task is done, the task will commit it's output if required.  
           </li> 
           
 <li>
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+            If the task has been failed/killed, the output will be cleaned-up. 
+            If task could not cleanup (in exception block), a separate task 
+            will be launched with same attempt-id to do the cleanup.
           </li>
         
 </ol>
 <p>
 <span class="codefrag">FileOutputCommitter</span> is the default 
-        <span class="codefrag">OutputCommitter</span>.</p>
+        <span class="codefrag">OutputCommitter</span>. Job setup/cleanup tasks occupy 
+        map or reduce slots, whichever is free on the TaskTracker. And
+        JobCleanup task, TaskCleanup tasks and JobSetup task have the highest
+        priority, and in that order.</p>
 <a name="N10CA7"></a><a name="Task+Side-Effect+Files"></a>
 <h4>Task Side-Effect Files</h4>
 <p>In some applications, component tasks need to create and/or write to

docs/releasenotes.html

@@ -1,8 +1,108 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html><head>
-    <title>Hadoop 0.19.1</title></head>
+    <title>Hadoop 0.19.2</title></head>
 <body>
 <font face="sans-serif">
+	
+<h1>Hadoop 0.19.2 Release Notes</h1>
+The bug fixes and improvements are listed below.
+<ul>
+<h2>Changes Since Hadoop 0.19.1</h2>
+<h3>        Bug
+</h3>
+<ul>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-3998'>HADOOP-3998</a>] -         Got an exception from ClientFinalizer when the JT is terminated
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-4619'>HADOOP-4619</a>] -         hdfs_write infinite loop when dfs fails and cannot write files &gt; 2 GB
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-4638'>HADOOP-4638</a>] -         Exception thrown in/from RecoveryManager.recover() should be caught and handled
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-4719'>HADOOP-4719</a>] -         The ls shell command documentation is out-dated
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-4780'>HADOOP-4780</a>] -         Task Tracker  burns a lot of cpu in calling getLocalCache
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5146'>HADOOP-5146</a>] -         LocalDirAllocator misses files on the local filesystem
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5154'>HADOOP-5154</a>] -         4-way deadlock in FairShare scheduler
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5213'>HADOOP-5213</a>] -         BZip2CompressionOutputStream NullPointerException
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5231'>HADOOP-5231</a>] -         Negative number of maps in cluster summary
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5233'>HADOOP-5233</a>] -         Reducer not Succeded after 100%
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5241'>HADOOP-5241</a>] -         Reduce tasks get stuck because of over-estimated task size (regression from 0.18)
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5247'>HADOOP-5247</a>] -         NPEs in JobTracker and JobClient when mapred.jobtracker.completeuserjobs.maximum is set to zero.
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5269'>HADOOP-5269</a>] -         TaskTracker.runningTasks holding FAILED_UNCLEAN and KILLED_UNCLEAN taskStatuses forever in some cases.
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5280'>HADOOP-5280</a>] -         When expiring a lost launched task, JT doesn't remove the attempt from the taskidToTIPMap.
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5285'>HADOOP-5285</a>] -         JobTracker hangs for long periods of time
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5326'>HADOOP-5326</a>] -         bzip2 codec (CBZip2OutputStream) creates corrupted output file for some inputs
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5333'>HADOOP-5333</a>] -         The libhdfs append API is not coded correctly
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5374'>HADOOP-5374</a>] -         NPE in JobTracker.getTasksToSave() method
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5376'>HADOOP-5376</a>] -         JobInProgress.obtainTaskCleanupTask() throws an ArrayIndexOutOfBoundsException
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5384'>HADOOP-5384</a>] -         DataNodeCluster should not create blocks with generationStamp == 1
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5392'>HADOOP-5392</a>] -         JobTracker crashes during recovery if job files are garbled
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5421'>HADOOP-5421</a>] -         HADOOP-4638 has broken 0.19 compilation
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5440'>HADOOP-5440</a>] -         Successful taskid are not removed from TaskMemoryManager
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5446'>HADOOP-5446</a>] -         TaskTracker metrics are disabled
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5449'>HADOOP-5449</a>] -         Verify if JobHistory.HistoryCleaner works as expected
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5454'>HADOOP-5454</a>] -         SortedMapWritable: readFields() will not clear values before deserialization
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5465'>HADOOP-5465</a>] -         Blocks remain under-replicated
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5479'>HADOOP-5479</a>] -         NameNode should not send empty block replication request to DataNode
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5522'>HADOOP-5522</a>] -         Document job setup/cleaup tasks and task cleanup tasks in mapred tutorial
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5549'>HADOOP-5549</a>] -         ReplicationMonitor should schedule both replication and deletion work in one iteration
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5551'>HADOOP-5551</a>] -         Namenode permits directory destruction on overwrite
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5554'>HADOOP-5554</a>] -         DataNodeCluster should create blocks with the same generation stamp as the blocks created in CreateEditsLog
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5557'>HADOOP-5557</a>] -         Two minor problems in TestOverReplicatedBlocks
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5579'>HADOOP-5579</a>] -         libhdfs does not set errno correctly
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5644'>HADOOP-5644</a>] -         Namnode is stuck in safe mode
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5671'>HADOOP-5671</a>] -         DistCp.sameFile(..) should return true if src fs does not support checksum
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5728'>HADOOP-5728</a>] -         FSEditLog.printStatistics may cause IndexOutOfBoundsException
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5816'>HADOOP-5816</a>] -         ArrayIndexOutOfBoundsException when using KeyFieldBasedComparator
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5951'>HADOOP-5951</a>] -         StorageInfo needs Apache license header.
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-6017'>HADOOP-6017</a>] -         NameNode and SecondaryNameNode fail to restart because of abnormal filenames.
+</li>
+</ul>
+    
+<h3>        Improvement
+</h3>
+<ul>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5332'>HADOOP-5332</a>] -         Make support for file append API configurable
+</li>
+<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5379'>HADOOP-5379</a>] -         Throw exception instead of writing to System.err when there is a CRC error on CBZip2InputStream
+</li>
+</ul>
+</ul>
+
 
 <h1>Hadoop 0.19.1 Release Notes</h1>
 Hadoop 0.19.1 fixes serveral problems that may lead to data loss