Tsz Wo Nicholas Sze created HDFS-8254:
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Summary: 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
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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