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From "Walter Su (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8719) Erasure Coding: client generates too many small packets when writing parity data
Date Wed, 08 Jul 2015 10:32:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14618363#comment-14618363
] 

Walter Su commented on HDFS-8719:
---------------------------------

02 patch does adjustChunkBoundary() every time before switching streamer. It's a simple but
smart approach.

{code}
+    adjustChunkBoundary();
{code}
This line matters. Please remove the overrided function {{adjustChunkBoundary()}}. It's no
longer needed.

> 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
>         Attachments: HDFS-8719-001.patch, HDFS-8719-HDFS-7285-001.patch, HDFS-8719-HDFS-7285-002.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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