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From Flink CI <flink...@foxmail.com>
Subject Broken: apache/flink#40623 (master - d231032)
Date Thu, 10 Oct 2019 10:22:00 GMT
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style="font-size: 14px;">3 hrs, 52 mins, 31 secs</span>
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CHANGESET &#8594;</a>
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monospace;font-size:14px;line-height:22px;font-family: cousine, monospace; font-size: 14px;
text-align: left; line-height: 22px;">[FLINK-14118][runtime] Reduce the unnecessary flushing
when there is no data available for flush. (#9706)<br/><br/>The purpose of this
commit is to reduce unnecessary flushing when there is no data available for flush. More specifically,
when there is exactly one BufferConsumer in the buffer queue of subpartition and no new data
will be added for a while in the future (may because of just no input or the logic of the
operator is to collect some data for processing and will not emit records immediately), the
previous implementation will continuously notify data available (may wake up the netty thread),
which is unnecessary, and eliminating these unnecessary flush can reduce CPU usage by 20%
- 40% for some jobs.
<br/>
<br/>Benchmark results before the fix:
<br/>
<br/>Benchmark    Mode     Cnt     Score      Error   Units
<br/>networkSkewedThroughput     thrpt    30   18240.197 ?? 1892.419 ops/ms
<br/>
<br/>After the fix:
<br/>
<br/>networkSkewedThroughput     thrpt    30   24532.313 ?? 1118.312 ops/m</p>
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