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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11708) Positional read will fail if replicas moved to different DNs after stream is opened
Date Wed, 07 Jun 2017 05:57:18 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11708?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Brahma Reddy Battula updated HDFS-11708:
----------------------------------------
    Labels:   (was: release-blocker)

> Positional read will fail if replicas moved to different DNs after stream is opened
> -----------------------------------------------------------------------------------
>
>                 Key: HDFS-11708
>                 URL: https://issues.apache.org/jira/browse/HDFS-11708
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>    Affects Versions: 2.7.3
>            Reporter: Vinayakumar B
>            Assignee: Vinayakumar B
>            Priority: Critical
>             Fix For: 2.9.0, 2.7.4, 3.0.0-alpha4, 2.8.2
>
>         Attachments: HDFS-11708-01.patch, HDFS-11708-02.patch, HDFS-11708-03.patch, HDFS-11708-04.patch,
HDFS-11708-05.patch, HDFS-11708-07.patch, HDFS-11708-07.patch, HDFS-11708-branch-2-07.patch,
HDFS-11708-branch-2.7-07.patch, HDFS-11708-branch-2.8-07.patch, HDFS-11708-HDFS-11898-06.patch
>
>
> Scenario:
> 1. File was written to DN1, DN2 with RF=2
> 2. File stream opened to read and kept. Block Locations are [DN1,DN2]
> 3. One of the replica (DN2) moved to another datanode (DN3) due to datanode dead/balancing/etc.
> 4. Latest block locations in NameNode will be DN1 and DN3 in the 'same order'
> 5. DN1 went down, but not yet detected as dead in NameNode.
> 6. Client start reading using positional read api "read(pos, buf[], offset, length)"



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