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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