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https://issues.apache.org/jira/browse/HDFS-9710?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo Nicholas Sze updated HDFS-9710:
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Attachment: h9710_20160216.patch
Many existing tests assume that datanodes send block receipt immediately. For
example, TestDecommission#testRecommission creates a file with #replication ==
5 and closes it. Then it calls getFileBlockLocations and expects the
#locations must be 5. The assumption is incorrect since the test will fail if
one of the 5 datanodes is slow. I will fix these tests later.
Let me test the patch with the new feature disabled.
h9710_20160216.patch: sets DFS_BLOCKREPORT_INCREMENTAL_INTERVAL_MSEC_DEFAULT to
0.
> Change DN to send block receipt IBRs in batches
> -----------------------------------------------
>
> Key: HDFS-9710
> URL: https://issues.apache.org/jira/browse/HDFS-9710
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
> Attachments: h9710_20160201.patch, h9710_20160205.patch,
> h9710_20160216.patch
>
>
> When a DN has received a block, it immediately sends a block receipt IBR RPC
> to NN for report the block. Even if a DN has received multiple blocks about
> the same time, it still sends multiple RPCs. It does not scale well since NN
> has to process a huge number of RPCs when many DNs receiving many blocks at
> the same time.
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