Github user tedyu commented on the pull request:
https://github.com/apache/spark/pull/9054#issuecomment-147127347
We have:
```
public int ioRetryWaitTimeMs() {
return (int)
JavaUtils.timeStringAsSec(conf.get("spark.shuffle.io.retryWait", "5s")) * 1000;
```
According to
http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/util/concurrent/Executors.java#Executors.newCachedThreadPool%28java.util.concurrent.ThreadFactory%29
, keepalive timeout is 60 sec.
If there are relatively heavy retries, default keepalive timeout would keep
more threads alive than necessary.
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