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From yjzhan...@apache.org
Subject hadoop git commit: HDFS-9889. Update balancer/mover document about HDFS-6133 feature. Contributed by Yongjun Zhang.
Date Fri, 04 Mar 2016 21:29:12 GMT
Repository: hadoop
Updated Branches:
  refs/heads/trunk 3e8099a45 -> 8e08861a1


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/trunk
Commit: 8e08861a14cb5b6adce338543d7da08e9926ad46
Parents: 3e8099a
Author: Yongjun Zhang <yzhang@cloudera.com>
Authored: Fri Mar 4 13:25:29 2016 -0800
Committer: Yongjun Zhang <yzhang@cloudera.com>
Committed: Fri Mar 4 13:25:29 2016 -0800

----------------------------------------------------------------------
 .../hadoop-hdfs/src/site/markdown/HDFSCommands.md                | 4 ++++
 1 file changed, 4 insertions(+)
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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:


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