hfutatzhanghb opened a new pull request, #6644:
URL: https://github.com/apache/hadoop/pull/6644
### Description of PR
We add an phone alarm on metrics sumOfActorCommandQueueLength when it
beyond 3000.
Recently, we received the alarm and we found that `DatanodeCommand[] cmds`
with array length equals to 0 was
still put into queue and incrActorCmdQueueLength.
When processedCommandsOpAvgTime is high, those empty cmds were put into
queue every heartbeat intervel.
sumOfActorCommandQueueLength should better only record valid commands.
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