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