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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9106) Transfer failure during pipeline recovery causes permanent write failures
Date Mon, 28 Sep 2015 22:16:06 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14934184#comment-14934184
] 

Hudson commented on HDFS-9106:
------------------------------

FAILURE: Integrated in Hadoop-Yarn-trunk #1192 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/1192/])
HDFS-9106. Transfer failure during pipeline recovery causes permanent write failures. Contributed
by Kihwal Lee. (kihwal: rev 4c9497cbf02ecc82532a4e79e18912d8e0eb4731)
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DataStreamer.java


> Transfer failure during pipeline recovery causes permanent write failures
> -------------------------------------------------------------------------
>
>                 Key: HDFS-9106
>                 URL: https://issues.apache.org/jira/browse/HDFS-9106
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Critical
>             Fix For: 2.7.2
>
>         Attachments: HDFS-9106-poc.patch, HDFS-9106.branch-2.7.patch, HDFS-9106.patch
>
>
> When a new node is added to a write pipeline during flush/sync, if the partial block
transfer fails, the write will fail permanently without retrying or continuing with whatever
is in the pipeline. 
> The transfer often fails in busy clusters due to timeout. There is no per-packet ACK
between client and datanode or between source and target datanodes. If the total transfer
time exceeds the configured timeout + 10 seconds (2 * 5 seconds slack), it is considered failed.
 Naturally, the failure rate is higher with bigger block sizes.
> I propose following changes:
> - Transfer timeout needs to be different from per-packet timeout.
> - transfer should be retried if fails.



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