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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9754) Avoid unnecessary getBlockCollection calls in BlockManager
Date Wed, 22 Nov 2017 23:42:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16263565#comment-16263565
] 

Konstantin Shvachko commented on HDFS-9754:
-------------------------------------------

Proposing to revert this in HDFS-12638. [See this comment|https://issues.apache.org/jira/browse/HDFS-12638?focusedCommentId=16263561&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16263561]
for more details.

> 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: 2.9.0, 3.0.0-alpha1, 2.8.2
>
>         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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