Michael Smith created IMPALA-14872:
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Summary: Don't hold query_driver_map_ lock while calling
GetMaxBackendStateLagMs
Key: IMPALA-14872
URL: https://issues.apache.org/jira/browse/IMPALA-14872
Project: IMPALA
Issue Type: Bug
Affects Versions: Impala 4.5.0
Reporter: Michael Smith
query_driver_map_ is a highly contended data structure. Accessing it acquires a
lock that prevents any other query progress on queries that share a shard, and
by default there are only 4 shards.
GetMaxBackendStateLagMs acquires a lock on each BackendState object, which may
also be in use (notably while sending a CancelQueryFInstancesRequestPB RPC in
Cancel()), for a coordinator within DoFuncForAllEntries in
https://github.com/apache/impala/blob/4.5.0/be/src/service/impala-server.cc#L2983.
Let's stop doing that.
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