HADOOP-7117. Remove fs.checkpoint.* from core-default.xml and replace fs.checkpoint.* with dfs.namenode.checkpoint.* in documentations. Contributed by Harsh J Chouraria
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1082329 13f79535-47bb-0310-9956-ffa450edef68
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@ -585,6 +585,10 @@ Release 0.21.1 - Unreleased
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HADOOP-7162. Rmove a duplicated call FileSystem.listStatus(..) in FsShell.
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(Alexey Diomin via szetszwo)
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HADOOP-7117. Remove fs.checkpoint.* from core-default.xml and replace
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fs.checkpoint.* with dfs.namenode.checkpoint.* in documentations.
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(Harsh J Chouraria via szetszwo)
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Release 0.21.0 - 2010-08-13
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INCOMPATIBLE CHANGES
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@ -548,7 +548,7 @@
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</tr>
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<tr>
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<td><code>-importCheckpoint</code></td>
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<td>从检查点目录装载镜像并保存到当前检查点目录，检查点目录由fs.checkpoint.dir指定。
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<td>从检查点目录装载镜像并保存到当前检查点目录，检查点目录由dfs.namenode.checkpoint.dir指定。
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</td>
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</tr>
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</table>
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@ -567,7 +567,7 @@
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<tr>
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<td><code>-checkpoint [force]</code></td>
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<td>如果EditLog的大小 >= fs.checkpoint.size，启动Secondary namenode的检查点过程。
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<td>如果EditLog的大小 >= dfs.namenode.checkpoint.size，启动Secondary namenode的检查点过程。
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如果使用了-force，将不考虑EditLog的大小。</td>
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</tr>
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<tr>
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@ -276,11 +276,11 @@ Secondary NameNode的检查点进程启动，是由两个配置参数控制的
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</p>
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<ul>
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<li>
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<code>fs.checkpoint.period</code>，指定连续两次检查点的最大时间间隔，
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<code>dfs.namenode.checkpoint.period</code>，指定连续两次检查点的最大时间间隔，
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默认值是1小时。
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</li>
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<li>
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<code>fs.checkpoint.size</code>定义了edits日志文件的最大值，一旦超过这个值会导致强制执行检查点（即使没到检查点的最大时间间隔）。默认值是64MB。
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<code>dfs.namenode.checkpoint.size</code>定义了edits日志文件的最大值，一旦超过这个值会导致强制执行检查点（即使没到检查点的最大时间间隔）。默认值是64MB。
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</li>
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</ul>
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<p>
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@ -296,17 +296,17 @@ Secondary NameNode的检查点进程启动，是由两个配置参数控制的
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在配置参数<code>dfs.name.dir</code>指定的位置建立一个空文件夹；
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</li>
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<li>
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把检查点目录的位置赋值给配置参数<code>fs.checkpoint.dir</code>；
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把检查点目录的位置赋值给配置参数<code>dfs.namenode.checkpoint.dir</code>；
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</li>
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<li>
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启动NameNode，并加上<code>-importCheckpoint</code>。
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</li>
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</ul>
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<p>
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NameNode会从<code>fs.checkpoint.dir</code>目录读取检查点，
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NameNode会从<code>dfs.namenode.checkpoint.dir</code>目录读取检查点，
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并把它保存在<code>dfs.name.dir</code>目录下。
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如果<code>dfs.name.dir</code>目录下有合法的镜像文件，NameNode会启动失败。
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NameNode会检查<code>fs.checkpoint.dir</code>目录下镜像文件的一致性，但是不会去改动它。
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NameNode会检查<code>dfs.namenode.checkpoint.dir</code>目录下镜像文件的一致性，但是不会去改动它。
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</p>
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<p>
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命令的使用方法请参考<a href="commands_manual.html#secondarynamenode"><code>secondarynamenode</code> 命令</a>.
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@ -320,11 +320,11 @@ Secondary NameNode的检查点进程启动，是由两个配置参数控制的
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+ </p>
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+ <ul>
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+ <li>
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+ <code>fs.checkpoint.period</code>, set to 1 hour by default, specifies
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+ <code>dfs.namenode.checkpoint.period</code>, set to 1 hour by default, specifies
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+ the maximum delay between two consecutive checkpoints, and
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+ </li>
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+ <li>
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+ <code>fs.checkpoint.size</code>, set to 64MB by default, defines the
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+ <code>dfs.namenode.checkpoint.size</code>, set to 64MB by default, defines the
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+ size of the edits log file that forces an urgent checkpoint even if
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+ the maximum checkpoint delay is not reached.
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+ </li>
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@ -347,7 +347,7 @@ Secondary NameNode的检查点进程启动，是由两个配置参数控制的
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+ </li>
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+ <li>
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+ Specify the location of the checkpoint directory in the
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+ configuration variable <code>fs.checkpoint.dir</code>;
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+ configuration variable <code>dfs.namenode.checkpoint.dir</code>;
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+ </li>
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+ <li>
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+ and start the NameNode with <code>-importCheckpoint</code> option.
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@ -355,11 +355,11 @@ Secondary NameNode的检查点进程启动，是由两个配置参数控制的
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+ </ul>
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+ <p>
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+ The NameNode will upload the checkpoint from the
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+ <code>fs.checkpoint.dir</code> directory and then save it to the NameNode
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+ <code>dfs.namenode.checkpoint.dir</code> directory and then save it to the NameNode
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+ directory(s) set in <code>dfs.name.dir</code>.
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+ The NameNode will fail if a legal image is contained in
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+ <code>dfs.name.dir</code>.
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+ The NameNode verifies that the image in <code>fs.checkpoint.dir</code> is
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+ The NameNode verifies that the image in <code>dfs.namenode.checkpoint.dir</code> is
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+ consistent, but does not modify it in any way.
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+ </p>
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+ <p>
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@ -726,7 +726,7 @@
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<tr>
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<td><code>-importCheckpoint</code></td>
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<td>Loads image from a checkpoint directory and saves it into the current one. Checkpoint directory
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is read from property fs.checkpoint.dir
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is read from property dfs.namenode.checkpoint.dir
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(see <a href="http://hadoop.apache.org/hdfs/docs/current/hdfs_user_guide.html#Import+checkpoint">Import Checkpoint</a>).
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</td>
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</tr>
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@ -763,7 +763,7 @@
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<tr>
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<td><code>-checkpoint [force]</code></td>
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<td>Checkpoints the Secondary namenode if EditLog size >= fs.checkpoint.size.
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<td>Checkpoints the Secondary namenode if EditLog size >= dfs.namenode.checkpoint.size.
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If -force is used, checkpoint irrespective of EditLog size.</td>
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</tr>
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<tr>
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@ -324,42 +324,6 @@
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<description>Don't cache 'har' filesystem instances.</description>
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</property>
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<property>
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<name>fs.checkpoint.dir</name>
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<value>${hadoop.tmp.dir}/dfs/namesecondary</value>
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<description>Determines where on the local filesystem the DFS secondary
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name node should store the temporary images to merge.
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If this is a comma-delimited list of directories then the image is
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replicated in all of the directories for redundancy.
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</description>
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</property>
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<property>
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<name>fs.checkpoint.edits.dir</name>
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<value>${fs.checkpoint.dir}</value>
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<description>Determines where on the local filesystem the DFS secondary
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name node should store the temporary edits to merge.
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If this is a comma-delimited list of directoires then teh edits is
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replicated in all of the directoires for redundancy.
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Default value is same as fs.checkpoint.dir
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</description>
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</property>
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<property>
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<name>fs.checkpoint.period</name>
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<value>3600</value>
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<description>The number of seconds between two periodic checkpoints.
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</description>
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</property>
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<property>
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<name>fs.checkpoint.size</name>
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<value>67108864</value>
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<description>The size of the current edit log (in bytes) that triggers
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a periodic checkpoint even if the fs.checkpoint.period hasn't expired.
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</description>
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</property>
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<property>
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<name>fs.df.interval</name>
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<value>60000</value>
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