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From "Walter Su (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8254) In StripedDataStreamer, it is hard to tolerate datanode failure in the leading streamer
Date Wed, 17 Jun 2015 08:53:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14589503#comment-14589503
] 

Walter Su commented on HDFS-8254:
---------------------------------

The patch did great job on synchronization. With the patch, we can fix the special cases easily
after. Btw, you missed {{initExtenalError()}}. I'm +1 after addressing this.

> In StripedDataStreamer, it is hard to tolerate datanode failure in the leading streamer
> ---------------------------------------------------------------------------------------
>
>                 Key: HDFS-8254
>                 URL: https://issues.apache.org/jira/browse/HDFS-8254
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>         Attachments: h8254_20150526.patch, h8254_20150526b.patch, h8254_20150616.patch
>
>
> StripedDataStreamer javadoc is shown below.
> {code}
>  * The StripedDataStreamer class is used by {@link DFSStripedOutputStream}.
>  * There are two kinds of StripedDataStreamer, leading streamer and ordinary
>  * stream. Leading streamer requests a block group from NameNode, unwraps
>  * it to located blocks and transfers each located block to its corresponding
>  * ordinary streamer via a blocking queue.
> {code}
> Leading streamer is the streamer with index 0.  When the datanode of the leading streamer
fails, the other steamers cannot continue since no one will request a block group from NameNode
anymore.



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