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https://issues.apache.org/jira/browse/HADOOP-10694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15279374#comment-15279374
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Hudson commented on HADOOP-10694:
---------------------------------
FAILURE: Integrated in Hadoop-trunk-Commit #9743 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/9743/])
HADOOP-10694. Remove synchronized input streams from Writable (ozawa: rev
6e565780315469584c47515be6bd189f07840f1b)
*
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/DataInputBuffer.java
> 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
> Fix For: 3.0.0, 2.9.0
>
> 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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