HDFS-10567. Improve plan command help message. Contributed by Xiaobing Zhou.
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@ -266,33 +266,40 @@ public class DiskBalancer extends Configured implements Tool {
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private void addPlanCommands(Options opt) {
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Option plan = OptionBuilder.withLongOpt(PLAN)
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.withDescription("creates a plan for datanode.")
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.withDescription("Hostname, IP address or UUID of datanode " +
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"for which a plan is created.")
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.hasArg()
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.create();
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getPlanOptions().addOption(plan);
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opt.addOption(plan);
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Option outFile = OptionBuilder.withLongOpt(OUTFILE)
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.hasArg()
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.withDescription("File to write output to, if not specified " +
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"defaults will be used.")
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Option outFile = OptionBuilder.withLongOpt(OUTFILE).hasArg()
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.withDescription(
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"Local path of file to write output to, if not specified "
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+ "defaults will be used.")
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.create();
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getPlanOptions().addOption(outFile);
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opt.addOption(outFile);
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Option bandwidth = OptionBuilder.withLongOpt(BANDWIDTH)
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.hasArg()
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.withDescription("Maximum disk bandwidth to be consumed by " +
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"diskBalancer. e.g. 10")
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Option bandwidth = OptionBuilder.withLongOpt(BANDWIDTH).hasArg()
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.withDescription(
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"Maximum disk bandwidth (MB/s) in integer to be consumed by "
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+ "diskBalancer. e.g. 10 MB/s.")
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.create();
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getPlanOptions().addOption(bandwidth);
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opt.addOption(bandwidth);
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Option threshold = OptionBuilder.withLongOpt(THRESHOLD)
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.hasArg()
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.withDescription("Percentage skew that we" +
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"tolerate before diskbalancer starts working e.g. 10")
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.withDescription("Percentage of data skew that is tolerated before"
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+ " disk balancer starts working. For example, if"
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+ " total data on a 2 disk node is 100 GB then disk"
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+ " balancer calculates the expected value on each disk,"
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+ " which is 50 GB. If the tolerance is 10% then data"
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+ " on a single disk needs to be more than 60 GB"
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+ " (50 GB + 10% tolerance value) for Disk balancer to"
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+ " balance the disks.")
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.create();
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getPlanOptions().addOption(threshold);
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opt.addOption(threshold);
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