Joe McDonnell created IMPALA-14855:
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Summary: Make the number of shards in the ShardedQueryMap
configurable
Key: IMPALA-14855
URL: https://issues.apache.org/jira/browse/IMPALA-14855
Project: IMPALA
Issue Type: Task
Components: Backend
Affects Versions: Impala 5.0.0
Reporter: Joe McDonnell
ShardedQueryMap currently uses a hard coded NUM_QUERY_BUCKETS (4) for the
number of shards. In some clusters, we have seen cases where there is
contention on the shard's lock. It would be useful to be able to tune this at
startup.
A different problem is that something can do expensive computation or take
other locks while holding the shard's lock (e.g. DoFuncForAllEntries). That
will need to be addressed separately.
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