hfutatzhanghb opened a new pull request, #5330:
URL: https://github.com/apache/hadoop/pull/5330
Now in method processCommandFromActor, we have code like below:
```java
writeLock();
try {
if (actor == bpServiceToActive) {
return processCommandFromActive(cmd, actor);
} else {
return processCommandFromStandby(cmd, actor);
}
} finally {
writeUnlock();
}
```
if method processCommandFromActive costs much time, the write lock would not
release.
It maybe block the `updateActorStatesFromHeartbeat` method in
offerService，furthermore, it can cause the lastcontact of datanode very high,
even dead when lastcontact beyond 600s.
```java
bpos.updateActorStatesFromHeartbeat(
this, resp.getNameNodeHaState());
```
here we can make write lock fine-grain in processCommandFromActor method to
address this problem
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