[jira] [Created] (IMPALA-8427) Document the behavior change in IMPALA-7800

["Michael Ho (JIRA)" <ji...@apache.org>]

Michael Ho created IMPALA-8427:
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             Summary: Document the behavior change in IMPALA-7800
                 Key: IMPALA-8427
                 URL: https://issues.apache.org/jira/browse/IMPALA-8427
             Project: IMPALA
          Issue Type: Documentation
          Components: Clients
    Affects Versions: Impala 3.3.0
            Reporter: Michael Ho
            Assignee: Alex Rodoni


IMPALA-7800 changes the default behavior of client connection timeout with HS2 and Beeswax Thrift servers. Quote from the commit message:

{noformat}
The current implementation of the FE thrift server waits
indefinitely to open the new session, if the maximum number of
FE service threads specified by --fe_service_threads has been
allocated.

This patch introduces a startup flag to control how the server
should treat new connection requests if we have run out of the
configured number of server threads.

If --accepted_client_cnxn_timeout > 0, new connection requests are
rejected by the server if we can't get a server thread within
the specified timeout.

We set the default timeout to be 5 minutes. The old behavior
can be restored by setting --accepted_client_cnxn_timeout=0,
i.e., no timeout. The timeout applies only to client facing thrift
servers, i.e., HS2 and Beeswax servers.
{noformat}



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