Secondary Namenode

Modified: hadoop/core/trunk/docs/hdfs_user_guide.pdf URL: http://svn.apache.org/viewvc/hadoop/core/trunk/docs/hdfs_user_guide.pdf?rev=671385&r1=671384&r2=671385&view=diff ============================================================================== --- hadoop/core/trunk/docs/hdfs_user_guide.pdf (original) +++ hadoop/core/trunk/docs/hdfs_user_guide.pdf Tue Jun 24 17:35:26 2008 @@ -1,14 +1,14 @@ %PDF-1.3 -%ª«¬ +%???? 4 0 obj << /Type /Info /Producer (FOP 0.20.5) >> endobj 5 0 obj -<< /Length 941 /Filter [ /ASCII85Decode /FlateDecode ] +<< /Length 950 /Filter [ /ASCII85Decode /FlateDecode ] >> stream 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http://svn.apache.org/viewvc/hadoop/core/trunk/src/docs/src/documentation/content/xdocs/hdfs_user_guide.xml?rev=671385&r1=671384&r2=671385&view=diff ============================================================================== --- hadoop/core/trunk/src/docs/src/documentation/content/xdocs/hdfs_user_guide.xml (original) +++ hadoop/core/trunk/src/docs/src/documentation/content/xdocs/hdfs_user_guide.xml Tue Jun 24 17:35:26 2008 @@ -112,9 +112,9 @@ problems.

- Secondary Namenode : helps keep the size of file - containing log of HDFS modification with in certain limit at - the Namenode. + Secondary Namenode : performs periodic checkpoints of the + namespace and helps keep the size of file containing log of HDFS + modifications within certain limits at the Namenode.

@@ -196,8 +196,8 @@

Secondary Namenode

- Namenode stores modifications to the filesystem as a log - appended to a native filesystem file (edits). + Namenode stores modifications to the file system as a log + appended to a native file system file (edits). When a Namenode starts up, it reads HDFS state from an image file (fsimage) and then applies edits from edits log file. It then writes new HDFS state to (fsimage) @@ -216,6 +216,54 @@ namenode is started by bin/start-dfs.sh on the nodes specified in conf/masters file.

+ The start of the checkpoint process on the secondary name-node is + controlled by two configuration parameters. +

+ fs.checkpoint.period, set to 1 hour by default, specifies + the maximal delay between two consecutive checkpoints, and +
+ fs.checkpoint.size, 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. +

+ 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. +

+ 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: +

+ create an empty storage directory specified in the + dfs.name.dir configuration variable; +
+ specify the location of the checkpoint storage directory in the + configuration variable fs.checkpoint.dir; +
+ and start the name-node with -importCheckpoint option. +

+ The name-node will upload the checkpoint from the + fs.checkpoint.dir directory and then save it to the name-node + storage directory(s) set in dfs.name.dir. + The name-node will fail if a legal image is contained in + dfs.name.dir. + The name-node verifies that the image in fs.checkpoint.dir is + consistent, but does not modify it in any way. +

Rebalancer

Secondary Namenode

Rebalancer

Rack Awareness

Safemode

Fsck

Upgrade and Rollback

File Permissions and Security

Scalability

Related Documentation