Github user ericl commented on the issue:
https://github.com/apache/spark/pull/14311
On jenkins, it seems sometimes one block manager will fail to register. The
only clue from the logs is
```
16/08/18 18:54:25.796 netty-rpc-connection-0 INFO TransportClientFactory:
Successfully created connection to /192.168.10.21:44000 after 1534 ms (0 ms
spent in bootstraps)
```
1534ms is much longer than the usual
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