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Posted to hdfs-issues@hadoop.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/11/25 04:07:00 UTC
[jira] [Updated] (HDFS-15695) NN should not let the balancer run in
safemode
[ https://issues.apache.org/jira/browse/HDFS-15695?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ASF GitHub Bot updated HDFS-15695:
----------------------------------
Labels: pull-request-available (was: )
> 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
> Time Spent: 10m
> 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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