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https://issues.apache.org/jira/browse/HDFS-9754?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Shvachko resolved HDFS-9754.
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Resolution: Fixed
Resolving this, based on the discussion in HDFS-12638.
Filed HDFS-12880 instead.
> Avoid unnecessary getBlockCollection calls in BlockManager
> ----------------------------------------------------------
>
> Key: HDFS-9754
> URL: https://issues.apache.org/jira/browse/HDFS-9754
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Fix For: 2.8.2, 3.0.0-alpha1, 2.9.0
>
> Attachments: HDFS-9754.000.patch, HDFS-9754.001.patch,
> HDFS-9754.002.patch
>
>
> Currently BlockManager calls {{Namesystem#getBlockCollection}} in order to:
> 1. check if the block has already been abandoned
> 2. identify the storage policy of the block
> 3. meta save
> For #1 we can use BlockInfo's internal state instead of checking if the
> corresponding file still exists.
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