bharatviswa504 commented on a change in pull request #71: HDDS-2344. Add
immutable entries in to the DoubleBuffer for Volume requests.
URL: https://github.com/apache/hadoop-ozone/pull/71#discussion_r338340651
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File path:
hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/request/volume/OMVolumeSetOwnerRequest.java
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@@ -171,7 +171,8 @@ public OMClientResponse
validateAndUpdateCache(OzoneManager ozoneManager,
omResponse.setSetVolumePropertyResponse(
SetVolumePropertyResponse.newBuilder().build());
omClientResponse = new OMVolumeSetOwnerResponse(oldOwner,
- oldOwnerVolumeList, newOwnerVolumeList, omVolumeArgs,
+ oldOwnerVolumeList, newOwnerVolumeList,
+ (OmVolumeArgs) omVolumeArgs.clone(),
Review comment:
https://issues.apache.org/jira/browse/HDDS-2322
The issue is seen with Key Operations, I think we might see the same issue
with Other Operations too. Let's take a case where RemoveAcl result
OMVolumeArgs is submitted to flushThread and other thread which is performing
removeAcl is updating the same OmVolumeArgs on this(Like we have a list and map
internally for acls). Then when we might see ConcurrentModificationException.
So to cover these kinds of scenario's updated all the places where we submit
the response to doubleBuffer flush threads.
And also one more thing is if we use same object, when flush happens we
might update the entries to rocksdb when some other operation is changing the
same entry and it still submitted/not submitted to doublebuffer flush thread.
To have a cleaner way all entries submitted to doubleBuffer flush are made as
immutable.
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