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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8719) Erasure Coding: client generates too many small packets when writing parity data
Date Wed, 30 Sep 2015 15:58:37 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14937108#comment-14937108
] 

Hudson commented on HDFS-8719:
------------------------------

FAILURE: Integrated in Hadoop-Hdfs-trunk #2379 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/2379/])
HDFS-8719. Erasure Coding: client generates too many small packets when (waltersu4549: rev
48f3830f2171420d65e74d7a44a6e7905012fe0d)
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSStripedOutputStream.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java


> Erasure Coding: client generates too many small packets when writing parity data
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-8719
>                 URL: https://issues.apache.org/jira/browse/HDFS-8719
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Li Bo
>            Assignee: Li Bo
>             Fix For: HDFS-7285
>
>         Attachments: HDFS-8719-001.patch, HDFS-8719-HDFS-7285-001.patch, HDFS-8719-HDFS-7285-002.patch,
HDFS-8719-HDFS-7285-003.patch
>
>
> Typically a packet is about 64K, but when writing parity data, many small packets with
size 512 bytes are generated. This may slow the write speed and increase the network IO.



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