[jira] [Updated] (TEZ-3284) Synchronization for every byte in UnorderdKVWriter

["Gopal V (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TEZ-3284?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gopal V updated TEZ-3284:
-------------------------
    Labels: Performance  (was: )

> Synchronization for every byte in UnorderdKVWriter
> --------------------------------------------------
>
>                 Key: TEZ-3284
>                 URL: https://issues.apache.org/jira/browse/TEZ-3284
>             Project: Apache Tez
>          Issue Type: Bug
>    Affects Versions: 0.9.0
>            Reporter: Gopal V
>            Priority: Critical
>              Labels: Performance
>
> {code}
>     baos = new ByteArrayOutputStream();
>     dos = new DataOutputStream(baos);
>     keySerializer.open(dos);
>     valSerializer.open(dos);
> {code}
> This is a known performance issue as documented in HADOOP-10694
> Both ByteArrayOutputStream::write() and DataOutputStream::write() have lock prefix calls in them, because they are object synchronized methods.
> Recommended solution is to replicate the Hive NonSync impls similar to HADOOP-10694



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