Quanlong Huang created IMPALA-13034:
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Summary: Add logs for slow HTTP requests dumping the profile
Key: IMPALA-13034
URL: https://issues.apache.org/jira/browse/IMPALA-13034
Project: IMPALA
Issue Type: Bug
Components: Backend
Reporter: Quanlong Huang
There are several endpoints in WebUI that can dump a query profile:
/query_profile, /query_profile_encoded, /query_profile_plain_text,
/query_profile_json
The HTTP handler thread goes into ImpalaServer::GetRuntimeProfileOutput() which
acquires lock of the ClientRequestState. This could blocks client requests in
fetching query results. We should add warning logs when such HTTP requests run
slow (e.g. when the profile is too large to download in a short time).
Related codes:
https://github.com/apache/impala/blob/f620e5d5c0bbdb0fd97bac31c7b7439cd13c6d08/be/src/service/impala-server.cc#L736
https://github.com/apache/impala/blob/f620e5d5c0bbdb0fd97bac31c7b7439cd13c6d08/be/src/service/impala-beeswax-server.cc#L601
https://github.com/apache/impala/blob/f620e5d5c0bbdb0fd97bac31c7b7439cd13c6d08/be/src/service/impala-hs2-server.cc#L207
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