Github user a-roberts commented on the issue:
https://github.com/apache/spark/pull/14961
Sean, yep, I've had trouble reproducing it too, kicked off a bunch of
builds over the weekend including one using Hadoop-2.3 which was my initial
theory (only difference between our testing environments apart from the options
I mention below)
I'll add
```
static {
System.setProperty("io.netty.recycler.maxCapacity", "0");
}
```
in TransportConf then build and test locally before updating this.
FWIW I use these Java options for testing as our boxes have limited memory:
-Xss2048k **-Dspark.buffer.pageSize=1048576** -Xmx4g
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