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From Joseph Wu <>
Subject Re: Review Request 69307: Changed master to hold subscribers in a circular buffer.
Date Wed, 05 Dec 2018 22:01:28 GMT

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(Updated Dec. 5, 2018, 2:01 p.m.)

Review request for mesos, Benno Evers, Benjamin Mahler, Gastón Kleiman, and Greg Mann.


Replaced one log message with a comment instead.
Upgraded one log message from VLOG(1) to LOG(INFO).
Modified test to remove the UPID hack.

Bugs: MESOS-9258

Repository: mesos


This adds a flag (--max_operator_event_stream_subscribers) to the
master which controls how many active subscribers on the Master's
event stream will be allowed at any time.
The default is 1000 subscribers, which is purposefully higher
than we expect is needed.  Operators aware that their  network
has clients/proxies whom do not close connections have the
option of lowering this flag.

Diffs (updated)

  docs/configuration/ 575476728079d884fe86b1a3a56614647d1b572e 
  src/master/constants.hpp 76ad0c3b1494cb97888af5545acc998b8fb15bf6 
  src/master/flags.hpp ed2d76af2831d1b9718724936fd3e4850e99b332 
  src/master/flags.cpp 2677738d19caa7d600e591aeb4fb37f0c2318d45 
  src/master/master.hpp c7becfa615964674dcf1ebd9424aa5818a0fdb85 
  src/master/master.cpp 3b3824a67f46866cd64e32d7f9f92484b5891aa2 
  src/tests/api_tests.cpp edde48a4b4b46c9f47bc44de389c97b77322b8e8 




make check

src/mesos-tests --gtest_filter="*MaxEventStreamSubscribers*" --gtest_repeat=-1 --gtest_break_on_failure


Joseph Wu

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