zhihai xu created HDFS-7835:
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             Summary: make initial sleeptime in locateFollowingBlock 
configurable for DFSClient.
                 Key: HDFS-7835
                 URL: https://issues.apache.org/jira/browse/HDFS-7835
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: dfsclient
            Reporter: zhihai xu
            Assignee: zhihai xu


Make initial sleeptime in locateFollowingBlock configurable for DFSClient.
Current the sleeptime/localTimeout in locateFollowingBlock/completeFile from 
DFSOutputStream is hard-coded as 400 ms, but retries can be configured by 
"dfs.client.block.write.locateFollowingBlock.retries". We should also make the 
initial sleeptime configurable to give user more flexibility to control both 
retry and delay.




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