You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@tez.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2016/05/29 03:16:13 UTC

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

Gopal V created TEZ-3284:
----------------------------

             Summary: 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


{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



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)