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https://issues.apache.org/jira/browse/HDFS-9198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15174214#comment-15174214
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Kihwal Lee commented on HDFS-9198:
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Relevant tests are all passing with this patch.
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-------------------------------------------------------
T E S T S
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OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=768m; support was
removed in 8.0
Running org.apache.hadoop.hdfs.server.datanode.TestIncrementalBrVariations
Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 18.301 sec - in
org.apache.hadoop.hdfs.server.datanode.TestIncrementalBrVariations
OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=768m; support was
removed in 8.0
Running org.apache.hadoop.hdfs.server.namenode.TestDeadDatanode
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 18.83 sec - in
org.apache.hadoop.hdfs.server.namenode.TestDeadDatanode
OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=768m; support was
removed in 8.0
Running org.apache.hadoop.hdfs.server.blockmanagement.TestBlockManager
Tests run: 17, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 27.238 sec -
in org.apache.hadoop.hdfs.server.blockmanagement.TestBlockManager
OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=768m; support was
removed in 8.0
Running org.apache.hadoop.hdfs.server.blockmanagement.TestPendingReplication
Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 33.094 sec - in
org.apache.hadoop.hdfs.server.blockmanagement.TestPendingReplication
OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=768m; support was
removed in 8.0
Running org.apache.hadoop.hdfs.TestDatanodeRegistration
Tests run: 6, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 18.187 sec - in
org.apache.hadoop.hdfs.TestDatanodeRegistration
Results :
Tests run: 32, Failures: 0, Errors: 0, Skipped: 0
{noformat}
Just committed to branch-2.7. Thanks, Vinay!
> Coalesce IBR processing in the NN
> ---------------------------------
>
> Key: HDFS-9198
> URL: https://issues.apache.org/jira/browse/HDFS-9198
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.0.0-alpha
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Fix For: 2.8.0, 2.7.3
>
> Attachments: HDFS-9198-Branch-2-withamend.diff,
> HDFS-9198-Branch-2.8-withamend.diff, HDFS-9198-branch-2.7.patch,
> HDFS-9198-branch2.patch, HDFS-9198-trunk.patch, HDFS-9198-trunk.patch,
> HDFS-9198-trunk.patch, HDFS-9198-trunk.patch, HDFS-9198-trunk.patch
>
>
> IBRs from thousands of DNs under load will degrade NN performance due to
> excessive write-lock contention from multiple IPC handler threads. The IBR
> processing is quick, so the lock contention may be reduced by coalescing
> multiple IBRs into a single write-lock transaction. The handlers will also
> be freed up faster for other operations.
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