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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 edited comment on HDFS-6602 at 6/25/14 5:05 PM:
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Since {{ReplicationMonitor}} is not running or not generating any work on SBN, 
{{invalidateBlocks}} is not consumed. Only when SBN becomes active, it will be 
cleared.  {{invalidateBlocks}} is populated during  block report processing. I 
think no queues including {{invalidateBlocks}} should be populated in standby.


was (Author: kihwal):
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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