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From "dragon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10054) CLONE - Avoid assigning a leading streamer in StripedDataStreamer to tolerate datanode failure
Date Tue, 15 Mar 2016 08:16:35 GMT
dragon created HDFS-10054:
-----------------------------

             Summary: CLONE - Avoid assigning a leading streamer in StripedDataStreamer to
tolerate datanode failure
                 Key: HDFS-10054
                 URL: https://issues.apache.org/jira/browse/HDFS-10054
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: dragon
            Assignee: Tsz Wo Nicholas Sze
             Fix For: HDFS-7285


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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