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Posted to hdfs-dev@hadoop.apache.org by "Ahmed Hussein (Jira)" <ji...@apache.org> on 2020/11/25 01:05:00 UTC

[jira] [Created] (HDFS-15695) NN should not let the balancer run in safemode

Ahmed Hussein created HDFS-15695:
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             Summary: 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


[~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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