HDFS-9889. Update balancer/mover document about HDFS-6133 feature. Contributed by Yongjun Zhang.
Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/8e08861a Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/8e08861a Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/8e08861a Branch: refs/heads/yarn-2877 Commit: 8e08861a14cb5b6adce338543d7da08e9926ad46 Parents: 3e8099a Author: Yongjun Zhang <yzh...@cloudera.com> Authored: Fri Mar 4 13:25:29 2016 -0800 Committer: Yongjun Zhang <yzh...@cloudera.com> Committed: Fri Mar 4 13:25:29 2016 -0800 ---------------------------------------------------------------------- .../hadoop-hdfs/src/site/markdown/HDFSCommands.md | 4 ++++ 1 file changed, 4 insertions(+) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/hadoop/blob/8e08861a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSCommands.md ---------------------------------------------------------------------- diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSCommands.md b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSCommands.md index dc6e935..ae126a2 100644 --- a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSCommands.md +++ b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSCommands.md @@ -285,6 +285,8 @@ 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>]` @@ -445,6 +447,8 @@ 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:
