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