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HDFS-7772. Document hdfs balancer -exclude/-include option in HDFSCommands.html. Contributed by Xiaoyu Yao.

This commit is contained in:
cnauroth 2015-02-18 11:46:57 -08:00
parent f5da5566d9
commit 2aa9979a71
3 changed files with 19 additions and 8 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -653,6 +653,9 @@ Release 2.7.0 - UNRELEASED
HDFS-7804. correct the haadmin command usage in #HDFSHighAvailabilityWithQJM.html
(Brahma Reddy Battula via umamahesh)
HDFS-7772. Document hdfs balancer -exclude/-include option in
HDFSCommands.html (Xiaoyu Yao via cnauroth)
OPTIMIZATIONS
HDFS-7454. Reduce memory footprint for AclEntries in NameNode.

7
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java
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@ -170,15 +170,14 @@ public class Balancer {
private static final long GB = 1L << 30; //1GB
private static final long MAX_SIZE_TO_MOVE = 10*GB;
private static final String USAGE = "Usage: java "
+ Balancer.class.getSimpleName()
private static final String USAGE = "Usage: hdfs balancer"
+ "\n\t[-policy <policy>]\tthe balancing policy: "
+ BalancingPolicy.Node.INSTANCE.getName() + " or "
+ BalancingPolicy.Pool.INSTANCE.getName()
+ "\n\t[-threshold <threshold>]\tPercentage of disk capacity"
+ "\n\t[-exclude [-f <hosts-file> | comma-sperated list of hosts]]"
+ "\n\t[-exclude [-f <hosts-file> | <comma-separated list of hosts>]]"
+ "\tExcludes the specified datanodes."
+ "\n\t[-include [-f <hosts-file> | comma-sperated list of hosts]]"
+ "\n\t[-include [-f <hosts-file> | <comma-separated list of hosts>]]"
+ "\tIncludes only the specified datanodes."
+ "\n\t[-idleiterations <idleiterations>]"
+ "\tNumber of consecutive idle iterations (-1 for Infinite) before exit.";

17
hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSCommands.md
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@ -245,13 +245,22 @@ Commands useful for administrators of a hadoop cluster.
### `balancer`
Usage: `hdfs balancer [-threshold <threshold>] [-policy <policy>] [-idleiterations <idleiterations>]`
Usage:
hdfs balancer
[-threshold <threshold>]
[-policy <policy>]
[-exclude [-f <hosts-file> | <comma-separated list of hosts>]]
[-include [-f <hosts-file> | <comma-separated list of hosts>]]
[-idleiterations <idleiterations>]
| COMMAND\_OPTION | Description |
|:---- |:---- |
| `-policy` *policy* | `datanode` (default): Cluster is balanced if each datanode is balanced.<br/> `blockpool`: Cluster is balanced if each block pool in each datanode is balanced. |
| `-threshold` *threshold* | Percentage of disk capacity. This overwrites the default threshold. |
| `-idleiterations` *iterations* | Maximum number of idle iterations before exit. This overwrites the default idleiterations(5). |
| `-policy` \<policy\> | `datanode` (default): Cluster is balanced if each datanode is balanced.<br/> `blockpool`: Cluster is balanced if each block pool in each datanode is balanced. |
| `-threshold` \<threshold\> | Percentage of disk capacity. This overwrites the default threshold. |
| `-exclude -f` \<hosts-file\> \| \<comma-separated list of hosts\> | Excludes the specified datanodes from being balanced by the balancer. |
| `-include -f` \<hosts-file\> \| \<comma-separated list of hosts\> | Includes only the specified datanodes to be balanced by the balancer. |
| `-idleiterations` \<iterations\> | Maximum number of idle iterations before exit. This overwrites the default idleiterations(5). |
Runs a cluster balancing utility. An administrator can simply press Ctrl-C to stop the rebalancing process. See [Balancer](./HdfsUserGuide.html#Balancer) for more details.