Shuyan Zhang created HDFS-16735:
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             Summary: Reduce the number of HeartbeatManager loops
                 Key: HDFS-16735
                 URL: https://issues.apache.org/jira/browse/HDFS-16735
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Shuyan Zhang


HeartbeatManager only processes one dead datanode (and failed storage) per 
round in heartbeatCheck(), that is to say, if there are ten failed storages, 
all datanode states need to be scanned 10 times, which is unnecessary. This 
patch makes the number of bad storages processed per scan configurable.



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