tarantool / tarantool / 13494
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LAST BUILD BRANCH: gh-10796-part-5-stop-replication
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locker 
vinyl: throttle tx rate if dump does not catch up

If the rate at which transactions are ready to write to the database is
greater than the dump bandwidth, memory will get depleted before the
last dump is complete and all newer transactions will have to wait until
the dump has been completed, which may take seconds or even minutes:

  2018-08-16 15:45:11.739 [30874] main/1100/main vy_quota.c:291 W> waited for 555 bytes of vinyl memory quota for too long: 15.750 sec

This patch set implements transaction throttling that are supposed to
help avoid unpredictably long stalls. Now once a dump is started,
transaction write rate will be limited so that the hard limit cannot get
exceeded before the dump is complete. This is how it looks in the log:

  2018-08-16 16:01:09.412 [489] main/445/main I> dumping 134217901 bytes, expected rate 6.0 MB/s, ETA 21.3 s, recent write rate 10.5 MB/s
  2018-08-16 16:01:09.447 [489] main/103/vinyl.scheduler I> 513/0: dump started
  2018-08-16 16:01:09.447 [489] vinyl.writer.0/103/task I> writing `./513/0/00000000000000000004.run'
  2018-08-16 16:01:09.468 [489] main I> throttling enabled, max write rate 6.0 MB/s
  2018-08-16 16:01:30.004 [489] vinyl.writer.0/103/task I> writing `./513/0/00000000000000000004.index'
  2018-08-16 16:01:30.094 [489] main/103/vinyl.scheduler I> 513/0: dump completed
  2018-08-16 16:01:30.095 [489] main/103/vinyl.scheduler I> dumped 134216236 bytes in 20.7 s, rate 6.2 MB/s
  2018-08-16 16:01:30.167 [489] main I> throttling disabled

Closes #1862

40076 of 48920 relevant lines covered (81.92%)

876090.7 hits per line

Jobs
ID Job ID Ran Files Coverage
3 13494.3 (TARGET=coverage) 303
81.92
 Travis Job 13494.3
Source Files on build 13494