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From "Lisheng Sun (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14648) DeadNodeDetector state machine model
Date Tue, 20 Aug 2019 00:13:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16910858#comment-16910858
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Lisheng Sun commented on HDFS-14648:
------------------------------------

hi [~linyiqun] [~jojochuang], [~hexiaoqiao] [~xkrogen] [~elgoiri] Could you have time to
review this patch? Thank you.

> DeadNodeDetector state machine model
> ------------------------------------
>
>                 Key: HDFS-14648
>                 URL: https://issues.apache.org/jira/browse/HDFS-14648
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Lisheng Sun
>            Assignee: Lisheng Sun
>            Priority: Major
>         Attachments: HDFS-14648.001.patch, HDFS-14648.002.patch, HDFS-14648.003.patch
>
>
> This Jira constructs DeadNodeDetector state machine model. The function it implements
as follow:
>  # After DFSInputstream detects some DataNode die, it put in DeadNodeDetector and share
this information to others in the same DFSClient. The ohter DFSInputstreams will not read
this DataNode.
>  # DeadNodeDetector also have DFSInputstream reference relationships to each DataNode.
When DFSInputstream close, DeadNodeDetector also remove this reference. If some DeadNode of
DeadNodeDetector is not read by DFSInputstream, it also is removed from DeadNodeDetector.



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