Github user jerryshao commented on the pull request:
https://github.com/apache/spark/pull/6294#issuecomment-137656481
Hi @tdas and @zsxwing , is it feasible to back port this patch to branch
1.4? This patch fixes a restart issue here by updating the state before calling
`receiver.onStart()`.
```scala
if (onReceiverStart()) {
logInfo("Starting receiver")
receiverState = Started
receiver.onStart()
logInfo("Called receiver onStart")
```
Previously this state is updated after calling `recevier.onStart()`, still
will introduce annoying bug in `SocketReceiver` when `restart()` is called.
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