Todd Lipcon created HBASE-5898:
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Summary: Consider double-checked locking for block cache lock
Key: HBASE-5898
URL: https://issues.apache.org/jira/browse/HBASE-5898
Project: HBase
Issue Type: Improvement
Components: performance
Affects Versions: 0.94.1
Reporter: Todd Lipcon
Running a workload with a high query rate against a dataset that fits in cache,
I saw a lot of CPU being used in IdLock.getLockEntry, being called by
HFileReaderV2.readBlock. Even though it was all cache hits, it was wasting a
lot of CPU doing lock management here. I wrote a quick patch to switch to a
double-checked locking and it improved throughput substantially for this
workload.
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