balancer
Runs a cluster balancing utility.
An administrator can simply press Ctrl+C to stop the rebalancing process.
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NOTE
The blockpool policy is stricter than the DataNode policy. |
The usage is as follows:
$ hdfs balancer
[-policy <policy>]
[-threshold <threshold>]
[-exclude [-f <hosts-file> | <comma-separated list of hosts>]]
[-include [-f <hosts-file> | <comma-separated list of hosts>]]
[-source [-f <hosts-file> | <comma-separated list of hosts>]]
[-blockpools <comma-separated list of blockpool ids>]
[-idleiterations <idleiterations>]
[-runDuringUpgrade]
[-asService]-policy <policy> |
Possible values:
|
threshold <threshold> | <comma-separated list of hosts> |
A 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 |
-source -f <hosts-file> | <comma-separated list of hosts> |
Picks only the specified DataNodes as source nodes |
-blockpools <comma-separated list of blockpool ids> |
Runs the balancer only on blockpools included in this list |
-idleiterations <iterations> |
The maximum number of idle iterations before exit.
This overwrites the default |
-runDuringUpgrade |
Specifies whether to run the balancer during an ongoing HDFS upgrade. This is not usually desired since it will not affect used space on over-utilized machines |
-asService |
Runs the balancer as a long-running service |
-h, --help |
Displays the tool usage and help information |