[jira] [Created] (IMPALA-13034) Add logs for slow HTTP requests dumping the profile

["Quanlong Huang (Jira)" <ji...@apache.org>]

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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