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Posted to common-commits@hadoop.apache.org by sh...@apache.org on 2008/06/25 02:44:18 UTC
svn commit: r671386 - in /hadoop/core/branches/branch-0.18: CHANGES.txt
docs/hdfs_user_guide.html docs/hdfs_user_guide.pdf
src/docs/src/documentation/content/xdocs/hdfs_user_guide.xml
Author: shv
Date: Tue Jun 24 17:44:17 2008
New Revision: 671386
URL: http://svn.apache.org/viewvc?rev=671386&view=rev
Log:
HADOOP-3541. Merge -r 671384:671385 from trunk to branch 0.18.
Modified:
hadoop/core/branches/branch-0.18/CHANGES.txt
hadoop/core/branches/branch-0.18/docs/hdfs_user_guide.html
hadoop/core/branches/branch-0.18/docs/hdfs_user_guide.pdf
hadoop/core/branches/branch-0.18/src/docs/src/documentation/content/xdocs/hdfs_user_guide.xml
Modified: hadoop/core/branches/branch-0.18/CHANGES.txt
URL: http://svn.apache.org/viewvc/hadoop/core/branches/branch-0.18/CHANGES.txt?rev=671386&r1=671385&r2=671386&view=diff
==============================================================================
--- hadoop/core/branches/branch-0.18/CHANGES.txt (original)
+++ hadoop/core/branches/branch-0.18/CHANGES.txt Tue Jun 24 17:44:17 2008
@@ -167,6 +167,9 @@
HADOOP-3413. Allow SequenceFile.Reader to use serialization
framework. (tomwhite via omalley)
+ HADOOP-3541. Import of the namespace from a checkpoint documented
+ in hadoop user guide. (shv)
+
IMPROVEMENTS
HADOOP-2928. Remove deprecated FileSystem.getContentLength().
Modified: hadoop/core/branches/branch-0.18/docs/hdfs_user_guide.html
URL: http://svn.apache.org/viewvc/hadoop/core/branches/branch-0.18/docs/hdfs_user_guide.html?rev=671386&r1=671385&r2=671386&view=diff
==============================================================================
--- hadoop/core/branches/branch-0.18/docs/hdfs_user_guide.html (original)
+++ hadoop/core/branches/branch-0.18/docs/hdfs_user_guide.html Tue Jun 24 17:44:17 2008
@@ -351,9 +351,9 @@
<li>
-<em>Secondary Namenode</em> : helps keep the size of file
- containing log of HDFS modification with in certain limit at
- the Namenode.
+<em>Secondary Namenode</em> : performs periodic checkpoints of the
+ namespace and helps keep the size of file containing log of HDFS
+ modifications within certain limits at the Namenode.
</li>
</ul>
@@ -458,8 +458,8 @@
<h2 class="h3"> Secondary Namenode </h2>
<div class="section">
<p>
- Namenode stores modifications to the filesystem as a log
- appended to a native filesystem file (<span class="codefrag">edits</span>).
+ Namenode stores modifications to the file system as a log
+ appended to a native file system file (<span class="codefrag">edits</span>).
When a Namenode starts up, it reads HDFS state from an image
file (<span class="codefrag">fsimage</span>) and then applies <em>edits</em> from
edits log file. It then writes new HDFS state to (<span class="codefrag">fsimage</span>)
@@ -478,8 +478,65 @@
namenode is started by <span class="codefrag">bin/start-dfs.sh</span> on the nodes
specified in <span class="codefrag">conf/masters</span> file.
</p>
+<p>
+ The start of the checkpoint process on the secondary name-node is
+ controlled by two configuration parameters.
+ </p>
+<ul>
+
+<li>
+
+<span class="codefrag">fs.checkpoint.period</span>, set to 1 hour by default, specifies
+ the maximal delay between two consecutive checkpoints, and
+ </li>
+
+<li>
+
+<span class="codefrag">fs.checkpoint.size</span>, set to 64MB by default, defines the
+ size of the edits log file that forces an urgent checkpoint even if
+ the maximal checkpoint delay is not reached.
+ </li>
+
+</ul>
+<p>
+ The secondary name-node stores the latest checkpoint in a storage
+ directory, which is structured the same way as the primary name-node's
+ storage directory. So that the checkpointed image is always ready to be
+ read by the primary name-node if necessary.
+ </p>
+<p>
+ The latest checkpoint can be imported to the primary name-node if
+ all other copies of the image and the edits files are lost.
+ In order to do that one should:
+ </p>
+<ul>
+
+<li>
+ create an empty storage directory specified in the
+ <span class="codefrag">dfs.name.dir</span> configuration variable;
+ </li>
+
+<li>
+ specify the location of the checkpoint storage directory in the
+ configuration variable <span class="codefrag">fs.checkpoint.dir</span>;
+ </li>
+
+<li>
+ and start the name-node with <span class="codefrag">-importCheckpoint</span> option.
+ </li>
+
+</ul>
+<p>
+ The name-node will upload the checkpoint from the
+ <span class="codefrag">fs.checkpoint.dir</span> directory and then save it to the name-node
+ storage directory(s) set in <span class="codefrag">dfs.name.dir</span>.
+ The name-node will fail if a legal image is contained in
+ <span class="codefrag">dfs.name.dir</span>.
+ The name-node verifies that the image in <span class="codefrag">fs.checkpoint.dir</span> is
+ consistent, but does not modify it in any way.
+ </p>
</div>
-<a name="N1010B"></a><a name="Rebalancer"></a>
+<a name="N10147"></a><a name="Rebalancer"></a>
<h2 class="h3"> Rebalancer </h2>
<div class="section">
<p>
@@ -524,7 +581,7 @@
<a href="http://issues.apache.org/jira/browse/HADOOP-1652">HADOOP-1652</a>.
</p>
</div>
-<a name="N10132"></a><a name="Rack+Awareness"></a>
+<a name="N1016E"></a><a name="Rack+Awareness"></a>
<h2 class="h3"> Rack Awareness </h2>
<div class="section">
<p>
@@ -543,7 +600,7 @@
<a href="http://issues.apache.org/jira/browse/HADOOP-692">HADOOP-692</a>.
</p>
</div>
-<a name="N10150"></a><a name="Safemode"></a>
+<a name="N1018C"></a><a name="Safemode"></a>
<h2 class="h3"> Safemode </h2>
<div class="section">
<p>
@@ -563,7 +620,7 @@
<a href="http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/dfs/NameNode.html#setSafeMode(org.apache.hadoop.dfs.FSConstants.SafeModeAction)"><span class="codefrag">setSafeMode()</span></a>.
</p>
</div>
-<a name="N1016E"></a><a name="Fsck"></a>
+<a name="N101AA"></a><a name="Fsck"></a>
<h2 class="h3"> Fsck </h2>
<div class="section">
<p>
@@ -580,7 +637,7 @@
Fsck can be run on the whole filesystem or on a subset of files.
</p>
</div>
-<a name="N1017E"></a><a name="Upgrade+and+Rollback"></a>
+<a name="N101BA"></a><a name="Upgrade+and+Rollback"></a>
<h2 class="h3"> Upgrade and Rollback </h2>
<div class="section">
<p>
@@ -639,7 +696,7 @@
</ul>
</div>
-<a name="N101BF"></a><a name="File+Permissions+and+Security"></a>
+<a name="N101FB"></a><a name="File+Permissions+and+Security"></a>
<h2 class="h3"> File Permissions and Security </h2>
<div class="section">
<p>
@@ -652,7 +709,7 @@
<a href="hdfs_permissions_guide.html"><em>Permissions User and Administrator Guide</em></a>.
</p>
</div>
-<a name="N101D1"></a><a name="Scalability"></a>
+<a name="N1020D"></a><a name="Scalability"></a>
<h2 class="h3"> Scalability </h2>
<div class="section">
<p>
@@ -670,7 +727,7 @@
suggested configuration improvements for large Hadoop clusters.
</p>
</div>
-<a name="N101E3"></a><a name="Related+Documentation"></a>
+<a name="N1021F"></a><a name="Related+Documentation"></a>
<h2 class="h3"> Related Documentation </h2>
<div class="section">
<p>
Modified: hadoop/core/branches/branch-0.18/docs/hdfs_user_guide.pdf
URL: http://svn.apache.org/viewvc/hadoop/core/branches/branch-0.18/docs/hdfs_user_guide.pdf?rev=671386&r1=671385&r2=671386&view=diff
==============================================================================
--- hadoop/core/branches/branch-0.18/docs/hdfs_user_guide.pdf (original)
+++ hadoop/core/branches/branch-0.18/docs/hdfs_user_guide.pdf Tue Jun 24 17:44:17 2008
@@ -1,14 +1,14 @@
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+/Kids [6 0 R 39 0 R 47 0 R 52 0 R 54 0 R 65 0 R 70 0 R ] >>
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%%EOF
Modified: hadoop/core/branches/branch-0.18/src/docs/src/documentation/content/xdocs/hdfs_user_guide.xml
URL: http://svn.apache.org/viewvc/hadoop/core/branches/branch-0.18/src/docs/src/documentation/content/xdocs/hdfs_user_guide.xml?rev=671386&r1=671385&r2=671386&view=diff
==============================================================================
--- hadoop/core/branches/branch-0.18/src/docs/src/documentation/content/xdocs/hdfs_user_guide.xml (original)
+++ hadoop/core/branches/branch-0.18/src/docs/src/documentation/content/xdocs/hdfs_user_guide.xml Tue Jun 24 17:44:17 2008
@@ -112,9 +112,9 @@
problems.
</li>
<li>
- <em>Secondary Namenode</em> : helps keep the size of file
- containing log of HDFS modification with in certain limit at
- the Namenode.
+ <em>Secondary Namenode</em> : performs periodic checkpoints of the
+ namespace and helps keep the size of file containing log of HDFS
+ modifications within certain limits at the Namenode.
</li>
</ul>
</li>
@@ -196,8 +196,8 @@
</section> <section> <title> Secondary Namenode </title>
<p>
- Namenode stores modifications to the filesystem as a log
- appended to a native filesystem file (<code>edits</code>).
+ Namenode stores modifications to the file system as a log
+ appended to a native file system file (<code>edits</code>).
When a Namenode starts up, it reads HDFS state from an image
file (<code>fsimage</code>) and then applies <em>edits</em> from
edits log file. It then writes new HDFS state to (<code>fsimage</code>)
@@ -216,6 +216,54 @@
namenode is started by <code>bin/start-dfs.sh</code> on the nodes
specified in <code>conf/masters</code> file.
</p>
+ <p>
+ The start of the checkpoint process on the secondary name-node is
+ controlled by two configuration parameters.
+ </p>
+ <ul>
+ <li>
+ <code>fs.checkpoint.period</code>, set to 1 hour by default, specifies
+ the maximal delay between two consecutive checkpoints, and
+ </li>
+ <li>
+ <code>fs.checkpoint.size</code>, set to 64MB by default, defines the
+ size of the edits log file that forces an urgent checkpoint even if
+ the maximal checkpoint delay is not reached.
+ </li>
+ </ul>
+ <p>
+ The secondary name-node stores the latest checkpoint in a storage
+ directory, which is structured the same way as the primary name-node's
+ storage directory. So that the checkpointed image is always ready to be
+ read by the primary name-node if necessary.
+ </p>
+ <p>
+ The latest checkpoint can be imported to the primary name-node if
+ all other copies of the image and the edits files are lost.
+ In order to do that one should:
+ </p>
+ <ul>
+ <li>
+ create an empty storage directory specified in the
+ <code>dfs.name.dir</code> configuration variable;
+ </li>
+ <li>
+ specify the location of the checkpoint storage directory in the
+ configuration variable <code>fs.checkpoint.dir</code>;
+ </li>
+ <li>
+ and start the name-node with <code>-importCheckpoint</code> option.
+ </li>
+ </ul>
+ <p>
+ The name-node will upload the checkpoint from the
+ <code>fs.checkpoint.dir</code> directory and then save it to the name-node
+ storage directory(s) set in <code>dfs.name.dir</code>.
+ The name-node will fail if a legal image is contained in
+ <code>dfs.name.dir</code>.
+ The name-node verifies that the image in <code>fs.checkpoint.dir</code> is
+ consistent, but does not modify it in any way.
+ </p>
</section> <section> <title> Rebalancer </title>
<p>