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https://issues.apache.org/jira/browse/HDFS-12423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16162443#comment-16162443
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Weiwei Yang commented on HDFS-12423:
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Thanks for filing this [~linyiqun], this is a good improvement to avoid
creating unnecessary tasks. +1 on the idea. Thanks.
> Ozone: TopN container choosing policy should ignore unnecessary containers
> --------------------------------------------------------------------------
>
> Key: HDFS-12423
> URL: https://issues.apache.org/jira/browse/HDFS-12423
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
> Affects Versions: HDFS-7240
> Reporter: Yiqun Lin
> Assignee: Yiqun Lin
>
> TopN container choosing policy should ignore unnecessary containers.
> Currently TopN policy selects specified count of containers but not check the
> number of pending deletion blocks. So there is a chance there will be some
> unnecessary containers being chosen. That is say we will choose some
> containers that don't include any pending deletion blocks. The related output:
> {noformat}
> 17/09/11 02:58:30 INFO impl.TopNOrderedContainerDeletionChoosingPolicy:
> Select container c7a85e6e-3528-45d1-8063-cd7fec114545 for block deletion,
> pending deletion blocks num: 1.
> 17/09/11 02:58:30 INFO impl.TopNOrderedContainerDeletionChoosingPolicy:
> Select container 1d163265-8d47-4ed3-845f-f7d3eb569b83 for block deletion,
> pending deletion blocks num: 0.
> 17/09/11 02:58:30 INFO impl.TopNOrderedContainerDeletionChoosingPolicy:
> Select container 21017018-be32-44e6-9f62-e7fc9f6a6021 for block deletion,
> pending deletion blocks num: 0.
> 17/09/11 02:58:30 INFO impl.TopNOrderedContainerDeletionChoosingPolicy:
> Select container 4cccadc8-ef5e-466d-bd9e-5b9705f8748c for block deletion,
> pending deletion blocks num: 0.
> 17/09/11 02:58:30 INFO impl.TopNOrderedContainerDeletionChoosingPolicy:
> Select container 55b11be9-f16f-4620-a310-07c9be3bbfee for block deletion,
> pending deletion blocks num: 0.
> {noformat}
> We should ignore these containers which pending deletion blocks num is 0,
> this can reduce some unnecessary block-deletion iterations.
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