captainzmc commented on a change in pull request #1296:
URL: https://github.com/apache/hadoop-ozone/pull/1296#discussion_r485570651
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File path:
hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/helpers/OmVolumeArgs.java
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@@ -46,6 +47,7 @@
private long quotaInBytes;
private long quotaInCounts;
private final OmOzoneAclMap aclMap;
+ private LongAdder quotaUsageInBytes = new LongAdder();
Review comment:
QuotaUsageInBytes is a property of Volume that needs to be updated each
time when CreateKey, AllocateBlock, CommitKey, DeleteKey, and the lock of
Volume is usually used.
Previously, only Bucket locks were used for these operation, and Volume
locks can greatly affect the concurrency performance of different buckets.
So to avoid Volume locking for poor performance, LongAdder is used here to
complete the atomic update of quotaUsageInBytes.
I did a performance test with freon. Multi-threading wrote different buckets
under the same volume, and using LongAdder had little impact on the original
performance.
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