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https://issues.apache.org/jira/browse/HDFS-6602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14043736#comment-14043736
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Kihwal Lee commented on HDFS-6602:
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Since {{ReplicationMonitor}} is not running on SBN, {{invalidateBlocks}} is not
consumed. Only when the SBN becomes active, it will be cleared.
{{invalidateBlocks}} is populated during block report processing. I think no
queue including {{invalidateBlocks}} should be populated in standby.
> PendingDeletionBlocks on SBN keeps increasing
> ---------------------------------------------
>
> Key: HDFS-6602
> URL: https://issues.apache.org/jira/browse/HDFS-6602
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.5.0
> Reporter: Kihwal Lee
> Priority: Critical
>
> PendingDeletionBlocks is from BlockManager.invalidateBlocks.numBlocks(). It
> means this data structure is populated, but IBR (incremental block reports)
> do not cause deleted blocks to be removed from it. As a result, the heap
> usage keeps increasing.
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