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Date: Thu, 27 Apr 2017 12:29:04 +0000 (UTC)
From: "Vinayakumar B (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.13067241.1493269235000.65547.1493296144426@Atlassian.JIRA>
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Subject: [jira] [Updated] (HDFS-11708) positional read will fail if replicas
 moved to different DNs after stream is opened
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archived-at: Thu, 27 Apr 2017 12:29:11 -0000


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

Vinayakumar B updated HDFS-11708:
---------------------------------
    Attachment:     (was: HDFS-11708-02.patch)

> 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
>         Attachments: HDFS-11708-01.patch, HDFS-11708-02.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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