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HDFS-9889. Update balancer/mover document about HDFS-6133 feature. Contributed by Yongjun Zhang. 

(cherry picked from commit 8e08861a14)
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Yongjun Zhang 2016-03-04 13:25:29 -08:00
parent 722182fdfb
commit 1d6c9486a4
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hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSCommands.md
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@ -283,6 +283,8 @@ Runs a cluster balancing utility. An administrator can simply press Ctrl-C to st
Note that the `blockpool` policy is more strict than the `datanode` policy.
Besides the above command options, a pinning feature is introduced starting from 2.7.0 to prevent certain replicas from getting moved by balancer/mover. This pinning feature is disabled by default, and can be enabled by configuration property "dfs.datanode.block-pinning.enabled". When enabled, this feature only affects blocks that are written to favored nodes specified in the create() call. This feature is useful when we want to maintain the data locality, for applications such as HBase regionserver.
### `cacheadmin`
Usage: `hdfs cacheadmin -addDirective -path <path> -pool <pool-name> [-force] [-replication <replication>] [-ttl <time-to-live>]`
@ -424,6 +426,8 @@ Runs the data migration utility. See [Mover](./ArchivalStorage.html#Mover_-_A_Ne
Note that, when both -p and -f options are omitted, the default path is the root directory.
In addition, a pinning feature is introduced starting from 2.7.0 to prevent certain replicas from getting moved by balancer/mover. This pinning feature is disabled by default, and can be enabled by configuration property "dfs.datanode.block-pinning.enabled". When enabled, this feature only affects blocks that are written to favored nodes specified in the create() call. This feature is useful when we want to maintain the data locality, for applications such as HBase regionserver.
### `namenode`
Usage: