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Posted to common-issues@hadoop.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2014/06/14 07:59:01 UTC
[jira] [Work started] (HADOOP-10694) Remove synchronized input
streams from Writable deserialization
[ https://issues.apache.org/jira/browse/HADOOP-10694?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on HADOOP-10694 started by Gopal V.
> 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
> Attachments: HADOOP-10694.1.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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