xiangzhou xia created CASSANDRA-13756:
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Summary: StreamingHistogram is not thread safe
Key: CASSANDRA-13756
URL: https://issues.apache.org/jira/browse/CASSANDRA-13756
Project: Cassandra
Issue Type: Bug
Reporter: xiangzhou xia
optimization in CASSANDRA-13038 led to a spool flush every time when we call
sum. Since TreeMap is not thread safe, threads will be stuck when multiple
threads visit sum() at the same time, and finally 100% cpu is stuck in that
function.
I think this issue is not limit to sum(), update() and merge() both have the
same issue since they all need to update TreeMap.
Add lock to bin solved this issue but it also introduced extra overhead.
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