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https://issues.apache.org/jira/browse/HDFS-8287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14726497#comment-14726497
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Jing Zhao commented on HDFS-8287:
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Thanks for working on this, Kai! I agree with Zhe's comments. Besides of that,
some further thoughts:
# Maybe it's better to wrap the two CellBuffers and logic of switching between
them into a single class named DoubleCellBuffer. An example in our current code
base is {{EditsDoubleBuffer}}.
# Instead of having a specific daemon thread ParityGenerator, maybe we can use
a {{CompletionService}} to simplify the code. Also in this way it's easier to
write code to wait for the writing of the parity blocks to finish.
> DFSStripedOutputStream.writeChunk should not wait for writing parity
> ---------------------------------------------------------------------
>
> Key: HDFS-8287
> URL: https://issues.apache.org/jira/browse/HDFS-8287
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Kai Sasaki
> Attachments: HDFS-8287-HDFS-7285.00.patch,
> HDFS-8287-HDFS-7285.01.patch, HDFS-8287-HDFS-7285.02.patch,
> HDFS-8287-HDFS-7285.03.patch, HDFS-8287-HDFS-7285.04.patch,
> HDFS-8287-HDFS-7285.05.patch
>
>
> When a stripping cell is full, writeChunk computes and generates parity
> packets. It sequentially calls waitAndQueuePacket so that user client cannot
> continue to write data until it finishes.
> We should allow user client to continue writing instead but not blocking it
> when writing parity.
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