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https://issues.apache.org/jira/browse/HDFS-15695?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jim Brennan resolved HDFS-15695.
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Fix Version/s: 3.2.3
3.1.5
3.4.0
3.3.1
Resolution: Fixed
Thanks [~daryn] and [~ahussein]!
I have committed this to trunk, branch-3.3, branch-3.2, and branch-3.1.
> NN should not let the balancer run in safemode
> ----------------------------------------------
>
> Key: HDFS-15695
> URL: https://issues.apache.org/jira/browse/HDFS-15695
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Reporter: Ahmed Hussein
> Assignee: Ahmed Hussein
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.3.1, 3.4.0, 3.1.5, 3.2.3
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> [~daryn] reported that when the balancer moves a block, the target DN block
> reports the new location and hints to invalidate the source DN. The NN will
> not issue invalidations in safemode, so every moved block appears to be in
> excess. The data structures bloat and greatly increase the chance of a full
> GC.
> The NN should refuse to provide block locations to the balancer while in
> safemode.
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