Use singletons for OperationStatus to save memory
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Key: HBASE-5255
URL: https://issues.apache.org/jira/browse/HBASE-5255
Project: HBase
Issue Type: Improvement
Components: regionserver
Affects Versions: 0.90.5, 0.92.0
Reporter: Benoit Sigoure
Assignee: Benoit Sigoure
Priority: Minor
Fix For: 0.94.0, 0.92.1
Every single {{Put}} causes the allocation of at least one {{OperationStatus}},
yet {{OperationStatus}} is almost always stateless, so these allocations are
unnecessary and could be avoided. Attached patch adds a few singletons and
uses them, with no public API change. I didn't test the patches, but you get
the idea.
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