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From "liaoyuxiangqin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-12380) Simplify dataQueue.wait condition logical operation
Date Thu, 31 Aug 2017 07:33:00 GMT
liaoyuxiangqin created HDFS-12380:

             Summary: Simplify dataQueue.wait condition logical operation
                 Key: HDFS-12380
                 URL: https://issues.apache.org/jira/browse/HDFS-12380
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs-client
    Affects Versions: 3.0.0-beta1
         Environment: cluster: 3 nodes
os:(Red Hat, Red Hat 3.10.0-514.6.1.el7.x86_64, Ubuntu4.4.0-31-generic)
hadoop version: hadoop-3.0.0-beta1
operation: Code review
            Reporter: liaoyuxiangqin
            Assignee: liaoyuxiangqin

    When i read the run() of DataStream class in hdfs-client, i found the following condition
code could be more simplify and easy to understand.
// wait for a packet to be sent.
long now = Time.monotonicNow();
while ((!shouldStop() && dataQueue.size() == 0 &&
     (stage != BlockConstructionStage.DATA_STREAMING ||
      stage == BlockConstructionStage.DATA_STREAMING &&
            now - lastPacket < halfSocketTimeout)) || doSleep ) {

      as described above code segmet, i find the code of stage !=DATA_STREAMING  and stage==DATA_STREAMING
appear at the same time in one  condition, so i think this condition logical not good understanding
and should simplify more.

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