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https://issues.apache.org/jira/browse/HDFS-9198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uma Maheswara Rao G updated HDFS-9198:
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Attachment: HDFS-9198-Branch-2.8-withamend.diff
HDFS-9198-Branch-2-withamend.diff
While merging to branch-2, I did the following edits to resolve conflicts.
{code}
- DatanodeStorageInfo[] getStorageInfos() {
+ @VisibleForTesting
+ public DatanodeStorageInfo[] getStorageInfos() {
{code}
Test depending on this. This change already exist in trunk, but not in
branch-2, just made it visible to testcode. Attached the patches what I
committed to branch-2 and 2.8 for reference.
> 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
>
> Attachments: HDFS-9198-Branch-2-withamend.diff,
> HDFS-9198-Branch-2.8-withamend.diff, 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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