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https://issues.apache.org/jira/browse/HDFS-4451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joshua Blatt updated HDFS-4451:
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Attachment: HDFS-4451.patch
> hdfs balancer exits 1 on success, it should exit 0
> --------------------------------------------------
>
> Key: HDFS-4451
> URL: https://issues.apache.org/jira/browse/HDFS-4451
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: balancer
> Affects Versions: 2.0.2-alpha
> Environment: Centos 6.3, JDK 1.6.0_25
> Reporter: Joshua Blatt
> Attachments: HDFS-4451.patch
>
>
> Though the org.apache.hadoop.util.Tool interface javadocs indicate
> implementations should return 0 on success, the
> org.apache.hadoop.hdfs.server.balance.Balancer.Cli implementation returns the
> int values of this enum instead:
> // Exit status
> enum ReturnStatus {
> SUCCESS(1),
> IN_PROGRESS(0),
> ALREADY_RUNNING(-1),
> NO_MOVE_BLOCK(-2),
> NO_MOVE_PROGRESS(-3),
> IO_EXCEPTION(-4),
> ILLEGAL_ARGS(-5),
> INTERRUPTED(-6);
> This created an issue for us when we tried to run the hdfs balancer as a cron
> job. Cron sends emails whenever a executable it runs exits non-zero. We'd
> either have to disable all emails and miss real issues or fix this bug.
> I think both SUCCESS and IN_PROGRESS ReturnStatuses should lead to exit 0.
> Marking this change as incompatible because existing scripts which interpret
> exit 1 as success will be broken (unless they defensively/liberally interpret
> both exit 1 and exit 0 as success).
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