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From "Henry Robinson (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-4135: Thrift threaded server times-out connections during high load
Date Fri, 07 Oct 2016 22:27:57 GMT
Henry Robinson has submitted this change and it was merged.

Change subject: IMPALA-4135: Thrift threaded server times-out connections during high load

IMPALA-4135: Thrift threaded server times-out connections during high load

During times of high load, Thrift's TThreadedServer can't keep up with the
rate of new socket connections, causing some to time out.

This patch creates TAcceptQueueServer, which is a modified version of
TThreadedServer that calls accept() and then hands the returned TTransport
off to a thread pool to handle setting up the connection. This ensures that
accept() is called as quickly as possible, preventing connections from timing
out while waiting.

It also adds a metric, connection-setup-queue-size, to monitor the number
of accepted connections waiting to be processed.

A flag, --accepted_cnxn_queue_depth, controls the size of the accepted
connection buffer.

- New test added to thrift-server-test. (Disabled by default, due to
  high ulimit -n requirement)
- Locally with the repro shown in IMPALA-4135.
- On the 16-node with a real repro query.
- Ran the stress test for a while.

Change-Id: Ie50e728974ef31a9d49132a0b3f7cde2a4f3356d
Tested-by: Internal Jenkins
Reviewed-by: Henry Robinson <>
M be/src/common/
M be/src/rpc/CMakeLists.txt
A be/src/rpc/TAcceptQueueServer.cpp
A be/src/rpc/TAcceptQueueServer.h
M be/src/rpc/
M be/src/rpc/
M be/src/rpc/thrift-server.h
M common/thrift/metrics.json
8 files changed, 545 insertions(+), 14 deletions(-)

  Henry Robinson: Looks good to me, approved
  Internal Jenkins: Verified

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Gerrit-MessageType: merged
Gerrit-Change-Id: Ie50e728974ef31a9d49132a0b3f7cde2a4f3356d
Gerrit-PatchSet: 9
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Thomas Tauber-Marshall <>
Gerrit-Reviewer: Henry Robinson <>
Gerrit-Reviewer: Internal Jenkins
Gerrit-Reviewer: Juan Yu <>
Gerrit-Reviewer: Matthew Jacobs <>
Gerrit-Reviewer: Sailesh Mukil <>
Gerrit-Reviewer: Thomas Tauber-Marshall <>

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