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From "Li Bo (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7729) Add logic to DFSOutputStream to support writing a file in striping layout
Date Thu, 12 Feb 2015 13:07:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14318149#comment-14318149
] 

Li Bo commented on HDFS-7729:
-----------------------------

Thanks for your careful review.
1.the variable {{hasSentEndPacket}} is duplicated with {{byteCurBlock}},will remove it in
new patch.
2.{{testCopyOnWrite}} also fails on trunk code, I think the failure is not caused by changes
of DFSOutputStream. You can have a further check. I will debug this problem tomorrow.
3.add  Javadoc in new patch.
4.add logic check if it’s striping layout when doing hflush or hsync operation.


> Add logic to DFSOutputStream to support writing a file in striping layout 
> --------------------------------------------------------------------------
>
>                 Key: HDFS-7729
>                 URL: https://issues.apache.org/jira/browse/HDFS-7729
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Li Bo
>            Assignee: Li Bo
>         Attachments: Codec-tmp.patch, HDFS-7729-001.patch, HDFS-7729-002.patch, HDFS-7729-003.patch,
HDFS-7729-004.patch, HDFS-7729-005.patch, HDFS-7729-006.patch, HDFS-7729-007.patch
>
>
> If client wants to directly write a file striping layout, we need to add some logic to
DFSOutputStream.  DFSOutputStream needs multiple DataStreamers to write each cell of a stripe
to a remote datanode. 



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