HDFS-7772. Document hdfs balancer -exclude/-include option in HDFSCommands.html. Contributed by Xiaoyu Yao.
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@ -653,6 +653,9 @@ Release 2.7.0 - UNRELEASED
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HDFS-7804. correct the haadmin command usage in #HDFSHighAvailabilityWithQJM.html
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(Brahma Reddy Battula via umamahesh)
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HDFS-7772. Document hdfs balancer -exclude/-include option in
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HDFSCommands.html (Xiaoyu Yao via cnauroth)
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OPTIMIZATIONS
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HDFS-7454. Reduce memory footprint for AclEntries in NameNode.
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@ -170,15 +170,14 @@ public class Balancer {
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private static final long GB = 1L << 30; //1GB
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private static final long MAX_SIZE_TO_MOVE = 10*GB;
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private static final String USAGE = "Usage: java "
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+ Balancer.class.getSimpleName()
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private static final String USAGE = "Usage: hdfs balancer"
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+ "\n\t[-policy <policy>]\tthe balancing policy: "
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+ BalancingPolicy.Node.INSTANCE.getName() + " or "
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+ BalancingPolicy.Pool.INSTANCE.getName()
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+ "\n\t[-threshold <threshold>]\tPercentage of disk capacity"
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+ "\n\t[-exclude [-f <hosts-file> | comma-sperated list of hosts]]"
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+ "\n\t[-exclude [-f <hosts-file> | <comma-separated list of hosts>]]"
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+ "\tExcludes the specified datanodes."
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+ "\n\t[-include [-f <hosts-file> | comma-sperated list of hosts]]"
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+ "\n\t[-include [-f <hosts-file> | <comma-separated list of hosts>]]"
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+ "\tIncludes only the specified datanodes."
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+ "\n\t[-idleiterations <idleiterations>]"
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+ "\tNumber of consecutive idle iterations (-1 for Infinite) before exit.";
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@ -245,13 +245,22 @@ Commands useful for administrators of a hadoop cluster.
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### `balancer`
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Usage: `hdfs balancer [-threshold <threshold>] [-policy <policy>] [-idleiterations <idleiterations>]`
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Usage:
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hdfs balancer
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[-threshold <threshold>]
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[-policy <policy>]
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[-exclude [-f <hosts-file> | <comma-separated list of hosts>]]
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[-include [-f <hosts-file> | <comma-separated list of hosts>]]
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[-idleiterations <idleiterations>]
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| COMMAND\_OPTION | Description |
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|:---- |:---- |
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| `-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. |
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| `-threshold` *threshold* | Percentage of disk capacity. This overwrites the default threshold. |
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| `-idleiterations` *iterations* | Maximum number of idle iterations before exit. This overwrites the default idleiterations(5). |
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| `-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. |
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| `-threshold` \<threshold\> | Percentage of disk capacity. This overwrites the default threshold. |
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| `-exclude -f` \<hosts-file\> \| \<comma-separated list of hosts\> | Excludes the specified datanodes from being balanced by the balancer. |
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| `-include -f` \<hosts-file\> \| \<comma-separated list of hosts\> | Includes only the specified datanodes to be balanced by the balancer. |
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| `-idleiterations` \<iterations\> | Maximum number of idle iterations before exit. This overwrites the default idleiterations(5). |
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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.
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