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https://issues.apache.org/jira/browse/HDFS-5986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13907636#comment-13907636
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Suresh Srinivas commented on HDFS-5986:
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Yes. It is the PendingDeletetionBlocksCount from invalidateBlocks. I like what
@atm suggested as well. I do not think there is a metrics corresponding to this.
> Capture the number of blocks pending deletion on namenode webUI
> ---------------------------------------------------------------
>
> Key: HDFS-5986
> URL: https://issues.apache.org/jira/browse/HDFS-5986
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Suresh Srinivas
>
> When a directory that has large number of directories and files are deleted,
> the namespace deletes the corresponding inodes immediately. However it is
> hard to to know when the invalidated blocks are actually deleted on the
> datanodes, which could take a while.
> I propose adding on namenode webUI, along with under replicated blocks, the
> number of blocks that are pending deletion.
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