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https://issues.apache.org/jira/browse/HDFS-8254?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-8254:
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Summary: Avoid assigning a leading streamer in StripedDataStreamer to
tolerate datanode failure (was: In StripedDataStreamer, it is hard to tolerate
datanode failure in the leading streamer)
> Avoid assigning a leading streamer in StripedDataStreamer to tolerate
> datanode failure
> --------------------------------------------------------------------------------------
>
> 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, h8254_20150618.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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