graham sanderson created CASSANDRA-7545:
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Summary: Hints for a down node are written to a single partition
in system.hints on the coordinator leading to contention
Key: CASSANDRA-7545
URL: https://issues.apache.org/jira/browse/CASSANDRA-7545
Project: Cassandra
Issue Type: Bug
Reporter: graham sanderson
The worst side effect is potentially orders of magnitude larger than suspected
memory allocation due to a race condition updating the columns in the memtable.
That said, having so many hints in a single partition has other negative side
effects (non linear growth of sorted tree data structure overhead in memtable,
just plain large number of tombstones in a row etc.)
Ideally, the hints would be partitioned by both the nodeUUID, and a fixed
number of (say 4) bits of a hash of the original rowmutation's partition key...
even this small spreading of load has a significant improvement.
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