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From "Tsuyoshi Ozawa (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10694) Remove synchronized input streams from Writable deserialization
Date Wed, 11 May 2016 00:26:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15279298#comment-15279298
] 

Tsuyoshi Ozawa commented on HADOOP-10694:
-----------------------------------------

The test failures looks to be not related since TestDNS and TestReloadingX509TrustManager
fails by DNS related problem.

> Remove synchronized input streams from Writable deserialization
> ---------------------------------------------------------------
>
>                 Key: HADOOP-10694
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10694
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: io
>            Reporter: Gopal V
>            Assignee: Gopal V
>              Labels: BB2015-05-TBR
>         Attachments: HADOOP-10694.1.patch, HADOOP-10694.2.patch, writable-read-sync.png
>
>
> Writable deserialization is slowing down due to a synchronized block within DataInputBuffer$Buffer.
> ByteArrayInputStream::read() is synchronized and this shows up as a slow uncontested
lock.
> Hive ships with its own faster thread-unsafe version with hive.common.io.NonSyncByteArrayInputStream.
> !writable-read-sync.png!
> The DataInputBuffer and Writable deserialization should not require a lock per readInt()/read().



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