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Posted to common-commits@hadoop.apache.org by dd...@apache.org on 2008/10/16 13:59:08 UTC
svn commit: r705215 [1/5] - in /hadoop/core/trunk: ./ conf/ docs/
src/docs/src/documentation/content/xdocs/
src/mapred/org/apache/hadoop/mapred/
src/mapred/org/apache/hadoop/mapred/pipes/
Author: ddas
Date: Thu Oct 16 04:59:06 2008
New Revision: 705215
URL: http://svn.apache.org/viewvc?rev=705215&view=rev
Log:
HADOOP-4418. Updates documentation in forrest for Mapred, streaming and pipes. Contributed by Amareshwari Sriramadasu.
Modified:
hadoop/core/trunk/CHANGES.txt
hadoop/core/trunk/conf/hadoop-default.xml
hadoop/core/trunk/docs/changes.html
hadoop/core/trunk/docs/cluster_setup.html
hadoop/core/trunk/docs/cluster_setup.pdf
hadoop/core/trunk/docs/hadoop-default.html
hadoop/core/trunk/docs/mapred_tutorial.html
hadoop/core/trunk/docs/mapred_tutorial.pdf
hadoop/core/trunk/docs/native_libraries.html
hadoop/core/trunk/docs/native_libraries.pdf
hadoop/core/trunk/docs/quickstart.html
hadoop/core/trunk/docs/quickstart.pdf
hadoop/core/trunk/docs/streaming.html
hadoop/core/trunk/docs/streaming.pdf
hadoop/core/trunk/src/docs/src/documentation/content/xdocs/cluster_setup.xml
hadoop/core/trunk/src/docs/src/documentation/content/xdocs/mapred_tutorial.xml
hadoop/core/trunk/src/docs/src/documentation/content/xdocs/native_libraries.xml
hadoop/core/trunk/src/docs/src/documentation/content/xdocs/site.xml
hadoop/core/trunk/src/docs/src/documentation/content/xdocs/streaming.xml
hadoop/core/trunk/src/mapred/org/apache/hadoop/mapred/package.html
hadoop/core/trunk/src/mapred/org/apache/hadoop/mapred/pipes/package.html
Modified: hadoop/core/trunk/CHANGES.txt
URL: http://svn.apache.org/viewvc/hadoop/core/trunk/CHANGES.txt?rev=705215&r1=705214&r2=705215&view=diff
==============================================================================
--- hadoop/core/trunk/CHANGES.txt (original)
+++ hadoop/core/trunk/CHANGES.txt Thu Oct 16 04:59:06 2008
@@ -940,6 +940,9 @@
HADOOP-4278. Increase debug logging for unit test TestDatanodeDeath.
(dhruba)
+ HADOOP-4418. Updates documentation in forrest for Mapred, streaming and pipes.
+ (Amareshwari Sriramadasu via ddas)
+
Release 0.18.2 - Unreleased
BUG FIXES
Modified: hadoop/core/trunk/conf/hadoop-default.xml
URL: http://svn.apache.org/viewvc/hadoop/core/trunk/conf/hadoop-default.xml?rev=705215&r1=705214&r2=705215&view=diff
==============================================================================
--- hadoop/core/trunk/conf/hadoop-default.xml (original)
+++ hadoop/core/trunk/conf/hadoop-default.xml Thu Oct 16 04:59:06 2008
@@ -763,7 +763,7 @@
<property>
<name>mapred.jobtracker.job.history.block.size</name>
- <value>3145728></value>
+ <value>3145728</value>
<description>The block size of the job history file. Since the job recovery
uses job history, its important to dump job history to disk as
soon as possible. Note that this is an expert level parameter.
Modified: hadoop/core/trunk/docs/changes.html
URL: http://svn.apache.org/viewvc/hadoop/core/trunk/docs/changes.html?rev=705215&r1=705214&r2=705215&view=diff
==============================================================================
--- hadoop/core/trunk/docs/changes.html (original)
+++ hadoop/core/trunk/docs/changes.html Thu Oct 16 04:59:06 2008
@@ -96,13 +96,14 @@
</ol>
</li>
<li><a href="javascript:toggleList('trunk_(unreleased_changes)_._bug_fixes_')"> BUG FIXES
-</a> (3)
+</a> (4)
<ol id="trunk_(unreleased_changes)_._bug_fixes_">
<li><a href="http://issues.apache.org/jira/browse/HADOOP-4204">HADOOP-4204</a>. Fix findbugs warnings related to unused variables, naive
Number subclass instantiation, Map iteration, and badly scoped inner
classes.<br />(Suresh Srinivas via cdouglas)</li>
<li><a href="http://issues.apache.org/jira/browse/HADOOP-4207">HADOOP-4207</a>. Update derby jar file to release 10.4.2 release.<br />(Prasad Chakka via dhruba)</li>
<li><a href="http://issues.apache.org/jira/browse/HADOOP-4325">HADOOP-4325</a>. SocketInputStream.read() should return -1 in case EOF.<br />(Raghu Angadi)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4408">HADOOP-4408</a>. FsAction functions need not create new objects.<br />(cdouglas)</li>
</ol>
</li>
</ul>
@@ -259,7 +260,7 @@
</ol>
</li>
<li><a href="javascript:toggleList('release_0.19.0_-_unreleased_._improvements_')"> IMPROVEMENTS
-</a> (72)
+</a> (74)
<ol id="release_0.19.0_-_unreleased_._improvements_">
<li><a href="http://issues.apache.org/jira/browse/HADOOP-4205">HADOOP-4205</a>. hive: metastore and ql to use the refactored SerDe library.<br />(zshao)</li>
<li><a href="http://issues.apache.org/jira/browse/HADOOP-4106">HADOOP-4106</a>. libhdfs: add time, permission and user attribute support
@@ -389,10 +390,13 @@
incrementing the task attempt numbers by 1000 when the job restarts.<br />(Amar Kamat via omalley)</li>
<li><a href="http://issues.apache.org/jira/browse/HADOOP-4301">HADOOP-4301</a>. Adds forrest doc for the skip bad records feature.<br />(Sharad Agarwal via ddas)</li>
<li><a href="http://issues.apache.org/jira/browse/HADOOP-4354">HADOOP-4354</a>. Separate TestDatanodeDeath.testDatanodeDeath() into 4 tests.<br />(szetszwo)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-3790">HADOOP-3790</a>. Add more unit tests for testing HDFS file append.<br />(szetszwo)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4150">HADOOP-4150</a>. Include librecordio in hadoop releases.<br />(Giridharan Kesavan
+via acmurthy)</li>
</ol>
</li>
<li><a href="javascript:toggleList('release_0.19.0_-_unreleased_._optimizations_')"> OPTIMIZATIONS
-</a> (9)
+</a> (11)
<ol id="release_0.19.0_-_unreleased_._optimizations_">
<li><a href="http://issues.apache.org/jira/browse/HADOOP-3556">HADOOP-3556</a>. Removed lock contention in MD5Hash by changing the
singleton MessageDigester by an instance per Thread using
@@ -412,10 +416,16 @@
<li><a href="http://issues.apache.org/jira/browse/HADOOP-3514">HADOOP-3514</a>. Inline the CRCs in intermediate files as opposed to reading
it from a different .crc file.<br />(Jothi Padmanabhan via ddas)</li>
<li><a href="http://issues.apache.org/jira/browse/HADOOP-3638">HADOOP-3638</a>. Caches the iFile index files in memory to reduce seeks<br />(Jothi Padmanabhan via ddas)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4225">HADOOP-4225</a>. FSEditLog.logOpenFile() should persist accessTime
+rather than modificationTime.<br />(shv)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4380">HADOOP-4380</a>. Made several new classes (Child, JVMId,
+JobTrackerInstrumentation, QueueManager, ResourceEstimator,
+TaskTrackerInstrumentation, and TaskTrackerMetricsInst) in
+org.apache.hadoop.mapred package private instead of public.<br />(omalley)</li>
</ol>
</li>
<li><a href="javascript:toggleList('release_0.19.0_-_unreleased_._bug_fixes_')"> BUG FIXES
-</a> (109)
+</a> (130)
<ol id="release_0.19.0_-_unreleased_._bug_fixes_">
<li><a href="http://issues.apache.org/jira/browse/HADOOP-3563">HADOOP-3563</a>. Refactor the distributed upgrade code so that it is
easier to identify datanode and namenode related code.<br />(dhruba)</li>
@@ -625,6 +635,45 @@
for small jobs.<br />(Amareshwari Sri Ramadasu via acmurthy)</li>
<li><a href="http://issues.apache.org/jira/browse/HADOOP-4163">HADOOP-4163</a>. Report FSErrors from map output fetch threads instead of
merely logging them.<br />(Sharad Agarwal via cdouglas)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4261">HADOOP-4261</a>. Adds a setup task for jobs. This is required so that we
+don't setup jobs that haven't been inited yet (since init could lead
+to job failure). Only after the init has successfully happened do we
+launch the setupJob task.<br />(Amareshwari Sriramadasu via ddas)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4256">HADOOP-4256</a>. Removes Completed and Failed Job tables from
+jobqueue_details.jsp.<br />(Sreekanth Ramakrishnan via ddas)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4267">HADOOP-4267</a>. Occasional exceptions during shutting down HSQLDB is logged
+but not rethrown.<br />(enis)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4018">HADOOP-4018</a>. The number of tasks for a single job cannot exceed a
+pre-configured maximum value.<br />(dhruba)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4288">HADOOP-4288</a>. Fixes a NPE problem in CapacityScheduler.<br />(Amar Kamat via ddas)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-3883">HADOOP-3883</a>. Limit namenode to assign at most one generation stamp for
+a particular block within a short period.<br />(szetszwo)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4014">HADOOP-4014</a>. Create hard links with 'fsutil hardlink' on Windows.<br />(shv)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4393">HADOOP-4393</a>. Merged org.apache.hadoop.fs.permission.AccessControlException
+and org.apache.hadoop.security.AccessControlIOException into a single
+class hadoop.security.AccessControlException.<br />(omalley via acmurthy)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4287">HADOOP-4287</a>. Fixes an issue to do with maintaining counts of running/pending
+maps/reduces.<br />(Sreekanth Ramakrishnan via ddas)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4361">HADOOP-4361</a>. Makes sure that jobs killed from command line are killed
+fast (i.e., there is a slot to run the cleanup task soon).<br />(Amareshwari Sriramadasu via ddas)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4400">HADOOP-4400</a>. Add "hdfs://" to fs.default.name on quickstart.html.<br />(Jeff Hammerbacher via omalley)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4403">HADOOP-4403</a>. Make TestLeaseRecovery and TestFileCreation more robust.<br />(szetszwo)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4378">HADOOP-4378</a>. Fix TestJobQueueInformation to use SleepJob rather than
+WordCount via TestMiniMRWithDFS.<br />(Sreekanth Ramakrishnan via acmurthy)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4376">HADOOP-4376</a>. Fix formatting in hadoop-default.xml for
+hadoop.http.filter.initializers.<br />(Enis Soztutar via acmurthy)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4410">HADOOP-4410</a>. Adds an extra arg to the API FileUtil.makeShellPath to
+determine whether to canonicalize file paths or not.<br />(Amareshwari Sriramadasu via ddas)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4236">HADOOP-4236</a>. Ensure un-initialized jobs are killed correctly on
+user-demand.<br />(Sharad Agarwal via acmurthy)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4373">HADOOP-4373</a>. Fix calculation of Guaranteed Capacity for the
+capacity-scheduler.<br />(Hemanth Yamijala via acmurthy)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4053">HADOOP-4053</a>. Schedulers must be notified when jobs complete.<br />(Amar Kamat via omalley)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4335">HADOOP-4335</a>. Fix FsShell -ls for filesystems without owners/groups.<br />(David
+Phillips via cdouglas)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4426">HADOOP-4426</a>. TestCapacityScheduler broke due to the two commits <a href="http://issues.apache.org/jira/browse/HADOOP-4053">HADOOP-4053</a>
+and <a href="http://issues.apache.org/jira/browse/HADOOP-4373">HADOOP-4373</a>. This patch fixes that.<br />(Hemanth Yamijala via ddas)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4278">HADOOP-4278</a>. Increase debug logging for unit test TestDatanodeDeath.<br />(dhruba)</li>
</ol>
</li>
</ul>
@@ -634,13 +683,19 @@
</a></h3>
<ul id="release_0.18.2_-_unreleased_">
<li><a href="javascript:toggleList('release_0.18.2_-_unreleased_._bug_fixes_')"> BUG FIXES
-</a> (3)
+</a> (7)
<ol id="release_0.18.2_-_unreleased_._bug_fixes_">
<li><a href="http://issues.apache.org/jira/browse/HADOOP-4116">HADOOP-4116</a>. Balancer should provide better resource management.<br />(hairong)</li>
<li><a href="http://issues.apache.org/jira/browse/HADOOP-3614">HADOOP-3614</a>. Fix a bug that Datanode may use an old GenerationStamp to get
meta file.<br />(szetszwo)</li>
<li><a href="http://issues.apache.org/jira/browse/HADOOP-4314">HADOOP-4314</a>. Simulated datanodes should not include blocks that are still
being written in their block report.<br />(Raghu Angadi)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4228">HADOOP-4228</a>. dfs datanoe metrics, bytes_read and bytes_written, overflow
+due to incorrect type used.<br />(hairong)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4395">HADOOP-4395</a>. The FSEditLog loading is incorrect for the case OP_SET_OWNER.<br />(szetszwo)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4351">HADOOP-4351</a>. FSNamesystem.getBlockLocationsInternal throws
+ArrayIndexOutOfBoundsException.<br />(hairong)</li>
+ <li><a href="http://issues.apache.org/jira/browse/HADOOP-4292">HADOOP-4292</a>. Do not support append() for LocalFileSystem.<br />(hairong)</li>
</ol>
</li>
</ul>
Modified: hadoop/core/trunk/docs/cluster_setup.html
URL: http://svn.apache.org/viewvc/hadoop/core/trunk/docs/cluster_setup.html?rev=705215&r1=705214&r2=705215&view=diff
==============================================================================
--- hadoop/core/trunk/docs/cluster_setup.html (original)
+++ hadoop/core/trunk/docs/cluster_setup.html Thu Oct 16 04:59:06 2008
@@ -231,6 +231,14 @@
</ul>
</li>
<li>
+<a href="#Cluster+Restartability">Cluster Restartability</a>
+<ul class="minitoc">
+<li>
+<a href="#Map%2FReduce">Map/Reduce</a>
+</li>
+</ul>
+</li>
+<li>
<a href="#Hadoop+Rack+Awareness">Hadoop Rack Awareness</a>
</li>
<li>
@@ -726,8 +734,21 @@
typically <span class="codefrag">${HADOOP_HOME}/conf</span>.</p>
</div>
+<a name="N10398"></a><a name="Cluster+Restartability"></a>
+<h2 class="h3">Cluster Restartability</h2>
+<div class="section">
+<a name="N1039E"></a><a name="Map%2FReduce"></a>
+<h3 class="h4">Map/Reduce</h3>
+<p>The job tracker restart can recover running jobs if
+ <span class="codefrag">mapred.jobtracker.restart.recover</span> is set true and
+ <a href="#Logging">JobHistory logging</a> is enabled. Also
+ <span class="codefrag">mapred.jobtracker.job.history.block.size</span> value should be
+ set to an optimal value to dump job history to disk as soon as
+ possible, the typical value is 3145728(3MB).</p>
+</div>
+
-<a name="N10398"></a><a name="Hadoop+Rack+Awareness"></a>
+<a name="N103B3"></a><a name="Hadoop+Rack+Awareness"></a>
<h2 class="h3">Hadoop Rack Awareness</h2>
<div class="section">
<p>The HDFS and the Map/Reduce components are rack-aware.</p>
@@ -750,7 +771,7 @@
</div>
-<a name="N103BE"></a><a name="Hadoop+Startup"></a>
+<a name="N103D9"></a><a name="Hadoop+Startup"></a>
<h2 class="h3">Hadoop Startup</h2>
<div class="section">
<p>To start a Hadoop cluster you will need to start both the HDFS and
@@ -785,7 +806,7 @@
</div>
-<a name="N10404"></a><a name="Hadoop+Shutdown"></a>
+<a name="N1041F"></a><a name="Hadoop+Shutdown"></a>
<h2 class="h3">Hadoop Shutdown</h2>
<div class="section">
<p>
Modified: hadoop/core/trunk/docs/cluster_setup.pdf
URL: http://svn.apache.org/viewvc/hadoop/core/trunk/docs/cluster_setup.pdf?rev=705215&r1=705214&r2=705215&view=diff
==============================================================================
--- hadoop/core/trunk/docs/cluster_setup.pdf (original)
+++ hadoop/core/trunk/docs/cluster_setup.pdf Thu Oct 16 04:59:06 2008
@@ -5,10 +5,10 @@
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@@ -124,31 +126,51 @@
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%%EOF
Modified: hadoop/core/trunk/docs/hadoop-default.html
URL: http://svn.apache.org/viewvc/hadoop/core/trunk/docs/hadoop-default.html?rev=705215&r1=705214&r2=705215&view=diff
==============================================================================
--- hadoop/core/trunk/docs/hadoop-default.html (original)
+++ hadoop/core/trunk/docs/hadoop-default.html Thu Oct 16 04:59:06 2008
@@ -11,12 +11,11 @@
<td><a name="hadoop.native.lib">hadoop.native.lib</a></td><td>true</td><td>Should native hadoop libraries, if present, be used.</td>
</tr>
<tr>
-<td><a name="hadoop.http.filter.initializers">hadoop.http.filter.initializers</a></td><td></td><td>A comma separated list of class names. Each class in the list must extend org.apache.hadoop.http.FilterInitializer.
-
- The corresponding Filter will be initialized. Then, the Filter will be applied to all user facing jsp and servlet web pages. The ordering of the list defines the ordering of the filters.
-
- The value can be empty.
- </td>
+<td><a name="hadoop.http.filter.initializers">hadoop.http.filter.initializers</a></td><td></td><td>A comma separated list of class names. Each class in the list
+ must extend org.apache.hadoop.http.FilterInitializer. The corresponding
+ Filter will be initialized. Then, the Filter will be applied to all user
+ facing jsp and servlet web pages. The ordering of the list defines the
+ ordering of the filters.</td>
</tr>
<tr>
<td><a name="hadoop.logfile.size">hadoop.logfile.size</a></td><td>10000000</td><td>The max size of each log file</td>
@@ -343,10 +342,12 @@
</td>
</tr>
<tr>
-<td><a name="dfs.namenode.decommission.interval">dfs.namenode.decommission.interval</a></td><td>300</td><td>Namenode periodicity in seconds to check if decommission is complete.</td>
+<td><a name="dfs.namenode.decommission.interval">dfs.namenode.decommission.interval</a></td><td>300</td><td>Namenode periodicity in seconds to check if decommission is
+ complete.</td>
</tr>
<tr>
-<td><a name="dfs.replication.interval">dfs.replication.interval</a></td><td>3</td><td>The periodicity in seconds with which the namenode computes repliaction work for datanodes. </td>
+<td><a name="dfs.replication.interval">dfs.replication.interval</a></td><td>3</td><td>The periodicity in seconds with which the namenode computes
+ repliaction work for datanodes. </td>
</tr>
<tr>
<td><a name="dfs.access.time.precision">dfs.access.time.precision</a></td><td>3600000</td><td>The access time for HDFS file is precise upto this value.
@@ -470,7 +471,7 @@
</td>
</tr>
<tr>
-<td><a name="mapred.jobtracker.job.history.block.size">mapred.jobtracker.job.history.block.size</a></td><td>3145728></td><td>The block size of the job history file. Since the job recovery
+<td><a name="mapred.jobtracker.job.history.block.size">mapred.jobtracker.job.history.block.size</a></td><td>3145728</td><td>The block size of the job history file. Since the job recovery
uses job history, its important to dump job history to disk as
soon as possible. Note that this is an expert level parameter.
The default value is set to 3 MB.
@@ -523,8 +524,8 @@
</td>
</tr>
<tr>
-<td><a name="mapred.jobtracker.completeuserjobs.maximum">mapred.jobtracker.completeuserjobs.maximum</a></td><td>100</td><td>The maximum number of complete jobs per user to keep around before delegating them to the job history.
- </td>
+<td><a name="mapred.jobtracker.completeuserjobs.maximum">mapred.jobtracker.completeuserjobs.maximum</a></td><td>100</td><td>The maximum number of complete jobs per user to keep around
+ before delegating them to the job history.</td>
</tr>
<tr>
<td><a name="mapred.jobtracker.instrumentation">mapred.jobtracker.instrumentation</a></td><td>org.apache.hadoop.mapred.JobTrackerMetricsInst</td><td>Expert: The instrumentation class to associate with each JobTracker.
@@ -608,6 +609,10 @@
take priority over this setting.</td>
</tr>
<tr>
+<td><a name="mapred.jobtracker.maxtasks.per.job">mapred.jobtracker.maxtasks.per.job</a></td><td>-1</td><td>The maximum number of tasks for a single job.
+ A value of -1 indicates that there is no maximum. </td>
+</tr>
+<tr>
<td><a name="mapred.submit.replication">mapred.submit.replication</a></td><td>10</td><td>The replication level for submitted job files. This
should be around the square root of the number of nodes.
</td>
Modified: hadoop/core/trunk/docs/mapred_tutorial.html
URL: http://svn.apache.org/viewvc/hadoop/core/trunk/docs/mapred_tutorial.html?rev=705215&r1=705214&r2=705215&view=diff
==============================================================================
--- hadoop/core/trunk/docs/mapred_tutorial.html (original)
+++ hadoop/core/trunk/docs/mapred_tutorial.html Thu Oct 16 04:59:06 2008
@@ -252,11 +252,20 @@
<a href="#Task+Execution+%26+Environment">Task Execution & Environment</a>
<ul class="minitoc">
<li>
+<a href="#Memory+management"> Memory management</a>
+</li>
+<li>
<a href="#Map+Parameters">Map Parameters</a>
</li>
<li>
<a href="#Shuffle%2FReduce+Parameters">Shuffle/Reduce Parameters</a>
</li>
+<li>
+<a href="#Directory+Structure"> Directory Structure </a>
+</li>
+<li>
+<a href="#Task+JVM+Reuse">Task JVM Reuse</a>
+</li>
</ul>
</li>
<li>
@@ -330,7 +339,7 @@
<a href="#Example%3A+WordCount+v2.0">Example: WordCount v2.0</a>
<ul class="minitoc">
<li>
-<a href="#Source+Code-N10F78">Source Code</a>
+<a href="#Source+Code-N10F9A">Source Code</a>
</li>
<li>
<a href="#Sample+Runs">Sample Runs</a>
@@ -1588,6 +1597,8 @@
<span class="codefrag"></property></span>
</p>
+<a name="N108BF"></a><a name="Memory+management"></a>
+<h4> Memory management</h4>
<p>Users/admins can also specify the maximum virtual memory
of the launched child-task, and any sub-process it launches
recursively, using <span class="codefrag">mapred.child.ulimit</span>. Note that
@@ -1629,7 +1640,7 @@
counters for a job- particularly relative to byte counts from the map
and into the reduce- is invaluable to the tuning of these
parameters.</p>
-<a name="N108E9"></a><a name="Map+Parameters"></a>
+<a name="N108F0"></a><a name="Map+Parameters"></a>
<h4>Map Parameters</h4>
<p>A record emitted from a map will be serialized into a buffer and
metadata will be stored into accounting buffers. As described in the
@@ -1703,7 +1714,7 @@
combiner.</li>
</ul>
-<a name="N10955"></a><a name="Shuffle%2FReduce+Parameters"></a>
+<a name="N1095C"></a><a name="Shuffle%2FReduce+Parameters"></a>
<h4>Shuffle/Reduce Parameters</h4>
<p>As described previously, each reduce fetches the output assigned
to it by the Partitioner via HTTP into memory and periodically
@@ -1799,6 +1810,8 @@
of the intermediate merge.</li>
</ul>
+<a name="N109D7"></a><a name="Directory+Structure"></a>
+<h4> Directory Structure </h4>
<p>The task tracker has local directory,
<span class="codefrag"> ${mapred.local.dir}/taskTracker/</span> to create localized
cache and localized job. It can define multiple local directories
@@ -1869,7 +1882,9 @@
<li>
<span class="codefrag">${mapred.local.dir}/taskTracker/jobcache/$jobid/$taskid/work</span>
- : The curernt working directory of the task. </li>
+ : The curernt working directory of the task.
+ With <a href="#Task+JVM+Reuse">jvm reuse</a> enabled for tasks, this
+ directory will be the directory on which the jvm has started</li>
<li>
<span class="codefrag">${mapred.local.dir}/taskTracker/jobcache/$jobid/$taskid/work/tmp</span>
@@ -1896,6 +1911,17 @@
</li>
</ul>
+<a name="N10A46"></a><a name="Task+JVM+Reuse"></a>
+<h4>Task JVM Reuse</h4>
+<p>Jobs can enable task JVMs to be reused by specifying the job
+ configuration <span class="codefrag">mapred.job.reuse.jvm.num.tasks</span>. If the
+ value is 1 (the default), then JVMs are not reused
+ (i.e. 1 task per JVM). If it is -1, there is no limit to the number
+ of tasks a JVM can run (of the same job). One can also specify some
+ value greater than 1 using the api
+ <a href="api/org/apache/hadoop/mapred/JobConf.html#setNumTasksToExecutePerJvm(int)">
+ JobConf.setNumTasksToExecutePerJvm(int)</a>
+</p>
<p>The following properties are localized in the job configuration
for each task's execution: </p>
<table class="ForrestTable" cellspacing="1" cellpadding="4">
@@ -1977,7 +2003,7 @@
<a href="native_libraries.html#Loading+native+libraries+through+DistributedCache">
native_libraries.html</a>
</p>
-<a name="N10B0D"></a><a name="Job+Submission+and+Monitoring"></a>
+<a name="N10B2F"></a><a name="Job+Submission+and+Monitoring"></a>
<h3 class="h4">Job Submission and Monitoring</h3>
<p>
<a href="api/org/apache/hadoop/mapred/JobClient.html">
@@ -2038,7 +2064,7 @@
<p>Normally the user creates the application, describes various facets
of the job via <span class="codefrag">JobConf</span>, and then uses the
<span class="codefrag">JobClient</span> to submit the job and monitor its progress.</p>
-<a name="N10B6D"></a><a name="Job+Control"></a>
+<a name="N10B8F"></a><a name="Job+Control"></a>
<h4>Job Control</h4>
<p>Users may need to chain Map/Reduce jobs to accomplish complex
tasks which cannot be done via a single Map/Reduce job. This is fairly
@@ -2074,7 +2100,7 @@
</li>
</ul>
-<a name="N10B97"></a><a name="Job+Input"></a>
+<a name="N10BB9"></a><a name="Job+Input"></a>
<h3 class="h4">Job Input</h3>
<p>
<a href="api/org/apache/hadoop/mapred/InputFormat.html">
@@ -2122,7 +2148,7 @@
appropriate <span class="codefrag">CompressionCodec</span>. However, it must be noted that
compressed files with the above extensions cannot be <em>split</em> and
each compressed file is processed in its entirety by a single mapper.</p>
-<a name="N10C01"></a><a name="InputSplit"></a>
+<a name="N10C23"></a><a name="InputSplit"></a>
<h4>InputSplit</h4>
<p>
<a href="api/org/apache/hadoop/mapred/InputSplit.html">
@@ -2136,7 +2162,7 @@
FileSplit</a> is the default <span class="codefrag">InputSplit</span>. It sets
<span class="codefrag">map.input.file</span> to the path of the input file for the
logical split.</p>
-<a name="N10C26"></a><a name="RecordReader"></a>
+<a name="N10C48"></a><a name="RecordReader"></a>
<h4>RecordReader</h4>
<p>
<a href="api/org/apache/hadoop/mapred/RecordReader.html">
@@ -2148,7 +2174,7 @@
for processing. <span class="codefrag">RecordReader</span> thus assumes the
responsibility of processing record boundaries and presents the tasks
with keys and values.</p>
-<a name="N10C49"></a><a name="Job+Output"></a>
+<a name="N10C6B"></a><a name="Job+Output"></a>
<h3 class="h4">Job Output</h3>
<p>
<a href="api/org/apache/hadoop/mapred/OutputFormat.html">
@@ -2173,7 +2199,7 @@
<p>
<span class="codefrag">TextOutputFormat</span> is the default
<span class="codefrag">OutputFormat</span>.</p>
-<a name="N10C72"></a><a name="OutputCommitter"></a>
+<a name="N10C94"></a><a name="OutputCommitter"></a>
<h4>OutputCommitter</h4>
<p>
<a href="api/org/apache/hadoop/mapred/OutputCommitter.html">
@@ -2215,7 +2241,7 @@
<p>
<span class="codefrag">FileOutputCommitter</span> is the default
<span class="codefrag">OutputCommitter</span>.</p>
-<a name="N10CA2"></a><a name="Task+Side-Effect+Files"></a>
+<a name="N10CC4"></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
side-files, which differ from the actual job-output files.</p>
@@ -2256,7 +2282,7 @@
<p>The entire discussion holds true for maps of jobs with
reducer=NONE (i.e. 0 reduces) since output of the map, in that case,
goes directly to HDFS.</p>
-<a name="N10CF0"></a><a name="RecordWriter"></a>
+<a name="N10D12"></a><a name="RecordWriter"></a>
<h4>RecordWriter</h4>
<p>
<a href="api/org/apache/hadoop/mapred/RecordWriter.html">
@@ -2264,9 +2290,9 @@
pairs to an output file.</p>
<p>RecordWriter implementations write the job outputs to the
<span class="codefrag">FileSystem</span>.</p>
-<a name="N10D07"></a><a name="Other+Useful+Features"></a>
+<a name="N10D29"></a><a name="Other+Useful+Features"></a>
<h3 class="h4">Other Useful Features</h3>
-<a name="N10D0D"></a><a name="Counters"></a>
+<a name="N10D2F"></a><a name="Counters"></a>
<h4>Counters</h4>
<p>
<span class="codefrag">Counters</span> represent global counters, defined either by
@@ -2283,7 +2309,7 @@
in the <span class="codefrag">map</span> and/or
<span class="codefrag">reduce</span> methods. These counters are then globally
aggregated by the framework.</p>
-<a name="N10D3C"></a><a name="DistributedCache"></a>
+<a name="N10D5E"></a><a name="DistributedCache"></a>
<h4>DistributedCache</h4>
<p>
<a href="api/org/apache/hadoop/filecache/DistributedCache.html">
@@ -2354,7 +2380,7 @@
<span class="codefrag">mapred.job.classpath.{files|archives}</span>. Similarly the
cached files that are symlinked into the working directory of the
task can be used to distribute native libraries and load them.</p>
-<a name="N10DBF"></a><a name="Tool"></a>
+<a name="N10DE1"></a><a name="Tool"></a>
<h4>Tool</h4>
<p>The <a href="api/org/apache/hadoop/util/Tool.html">Tool</a>
interface supports the handling of generic Hadoop command-line options.
@@ -2394,7 +2420,7 @@
</span>
</p>
-<a name="N10DF1"></a><a name="IsolationRunner"></a>
+<a name="N10E13"></a><a name="IsolationRunner"></a>
<h4>IsolationRunner</h4>
<p>
<a href="api/org/apache/hadoop/mapred/IsolationRunner.html">
@@ -2418,7 +2444,7 @@
<p>
<span class="codefrag">IsolationRunner</span> will run the failed task in a single
jvm, which can be in the debugger, over precisely the same input.</p>
-<a name="N10E24"></a><a name="Profiling"></a>
+<a name="N10E46"></a><a name="Profiling"></a>
<h4>Profiling</h4>
<p>Profiling is a utility to get a representative (2 or 3) sample
of built-in java profiler for a sample of maps and reduces. </p>
@@ -2451,7 +2477,7 @@
<span class="codefrag">-agentlib:hprof=cpu=samples,heap=sites,force=n,thread=y,verbose=n,file=%s</span>
</p>
-<a name="N10E58"></a><a name="Debugging"></a>
+<a name="N10E7A"></a><a name="Debugging"></a>
<h4>Debugging</h4>
<p>Map/Reduce framework provides a facility to run user-provided
scripts for debugging. When map/reduce task fails, user can run
@@ -2462,14 +2488,14 @@
<p> In the following sections we discuss how to submit debug script
along with the job. For submitting debug script, first it has to
distributed. Then the script has to supplied in Configuration. </p>
-<a name="N10E64"></a><a name="How+to+distribute+script+file%3A"></a>
+<a name="N10E86"></a><a name="How+to+distribute+script+file%3A"></a>
<h5> How to distribute script file: </h5>
<p>
The user has to use
<a href="mapred_tutorial.html#DistributedCache">DistributedCache</a>
mechanism to <em>distribute</em> and <em>symlink</em> the
debug script file.</p>
-<a name="N10E78"></a><a name="How+to+submit+script%3A"></a>
+<a name="N10E9A"></a><a name="How+to+submit+script%3A"></a>
<h5> How to submit script: </h5>
<p> A quick way to submit debug script is to set values for the
properties "mapred.map.task.debug.script" and
@@ -2493,17 +2519,17 @@
<span class="codefrag">$script $stdout $stderr $syslog $jobconf $program </span>
</p>
-<a name="N10E9A"></a><a name="Default+Behavior%3A"></a>
+<a name="N10EBC"></a><a name="Default+Behavior%3A"></a>
<h5> Default Behavior: </h5>
<p> For pipes, a default script is run to process core dumps under
gdb, prints stack trace and gives info about running threads. </p>
-<a name="N10EA5"></a><a name="JobControl"></a>
+<a name="N10EC7"></a><a name="JobControl"></a>
<h4>JobControl</h4>
<p>
<a href="api/org/apache/hadoop/mapred/jobcontrol/package-summary.html">
JobControl</a> is a utility which encapsulates a set of Map/Reduce jobs
and their dependencies.</p>
-<a name="N10EB2"></a><a name="Data+Compression"></a>
+<a name="N10ED4"></a><a name="Data+Compression"></a>
<h4>Data Compression</h4>
<p>Hadoop Map/Reduce provides facilities for the application-writer to
specify compression for both intermediate map-outputs and the
@@ -2517,7 +2543,7 @@
codecs for reasons of both performance (zlib) and non-availability of
Java libraries (lzo). More details on their usage and availability are
available <a href="native_libraries.html">here</a>.</p>
-<a name="N10ED2"></a><a name="Intermediate+Outputs"></a>
+<a name="N10EF4"></a><a name="Intermediate+Outputs"></a>
<h5>Intermediate Outputs</h5>
<p>Applications can control compression of intermediate map-outputs
via the
@@ -2526,7 +2552,7 @@
<span class="codefrag">CompressionCodec</span> to be used via the
<a href="api/org/apache/hadoop/mapred/JobConf.html#setMapOutputCompressorClass(java.lang.Class)">
JobConf.setMapOutputCompressorClass(Class)</a> api.</p>
-<a name="N10EE7"></a><a name="Job+Outputs"></a>
+<a name="N10F09"></a><a name="Job+Outputs"></a>
<h5>Job Outputs</h5>
<p>Applications can control compression of job-outputs via the
<a href="api/org/apache/hadoop/mapred/FileOutputFormat.html#setCompressOutput(org.apache.hadoop.mapred.JobConf,%20boolean)">
@@ -2543,7 +2569,7 @@
<a href="api/org/apache/hadoop/mapred/SequenceFileOutputFormat.html#setOutputCompressionType(org.apache.hadoop.mapred.JobConf,%20org.apache.hadoop.io.SequenceFile.CompressionType)">
SequenceFileOutputFormat.setOutputCompressionType(JobConf,
SequenceFile.CompressionType)</a> api.</p>
-<a name="N10F14"></a><a name="Skipping+Bad+Records"></a>
+<a name="N10F36"></a><a name="Skipping+Bad+Records"></a>
<h4>Skipping Bad Records</h4>
<p>Hadoop provides an optional mode of execution in which the bad
records are detected and skipped in further attempts.
@@ -2617,7 +2643,7 @@
</div>
-<a name="N10F5E"></a><a name="Example%3A+WordCount+v2.0"></a>
+<a name="N10F80"></a><a name="Example%3A+WordCount+v2.0"></a>
<h2 class="h3">Example: WordCount v2.0</h2>
<div class="section">
<p>Here is a more complete <span class="codefrag">WordCount</span> which uses many of the
@@ -2627,7 +2653,7 @@
<a href="quickstart.html#SingleNodeSetup">pseudo-distributed</a> or
<a href="quickstart.html#Fully-Distributed+Operation">fully-distributed</a>
Hadoop installation.</p>
-<a name="N10F78"></a><a name="Source+Code-N10F78"></a>
+<a name="N10F9A"></a><a name="Source+Code-N10F9A"></a>
<h3 class="h4">Source Code</h3>
<table class="ForrestTable" cellspacing="1" cellpadding="4">
@@ -3837,7 +3863,7 @@
</tr>
</table>
-<a name="N116DA"></a><a name="Sample+Runs"></a>
+<a name="N116FC"></a><a name="Sample+Runs"></a>
<h3 class="h4">Sample Runs</h3>
<p>Sample text-files as input:</p>
<p>
@@ -4005,7 +4031,7 @@
<br>
</p>
-<a name="N117AE"></a><a name="Highlights"></a>
+<a name="N117D0"></a><a name="Highlights"></a>
<h3 class="h4">Highlights</h3>
<p>The second version of <span class="codefrag">WordCount</span> improves upon the
previous one by using some features offered by the Map/Reduce framework: