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