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From "He Yongqiang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-720) Improve ByteStream by removing all synchronized method calls
Date Wed, 05 Aug 2009 05:23:14 GMT

    [ https://issues.apache.org/jira/browse/HIVE-720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12739343#action_12739343

He Yongqiang commented on HIVE-720:

Will do 1 and 2, and move the two classes into common.io.
>>what is the reason that HiveDataInputBuffer inherits FilterInputStream, while HiveDataOutputBuffer
inherits DataOutputStream?
Let me figure out why and add some comment.

> Improve ByteStream by removing all synchronized method calls
> ------------------------------------------------------------
>                 Key: HIVE-720
>                 URL: https://issues.apache.org/jira/browse/HIVE-720
>             Project: Hadoop Hive
>          Issue Type: Improvement
>            Reporter: Zheng Shao
>         Attachments: HIVE-720.1.patch
> org.apache.hadoop.hive.serde2.ByteStream has 2 inner classes: Input and Output, which
inherits from ByteArrayInputStream and ByteArrayOutputStream.
> Both these classes have a lot of sychronized methods, which make them really slow.
> We should let ByteStream.Input and ByteStream.Output directly inherit InputStream and
OutputStream so we don't need to call synchronized methods at all. This will help LazySimpleSerDe,
ColumnarSerDe as well as LazyBinarySerDe.

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