Apache Hadoop qbt Report: branch2+JDK7 on Linux/x86

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Apache Hadoop qbt Report: trunk+JDK8 on Linux/x86

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[jira] [Created] (HDFS-12971) DfsClint hang on hedged getFromOneDataNode

[muyannian (JIRA)]

muyannian created HDFS-12971:


 Summary: DfsClint hang on hedged getFromOneDataNode
 Key: HDFS-12971
 URL: https://issues.apache.org/jira/browse/HDFS-12971
 Project: Hadoop HDFS
  Issue Type: Bug
  Components: hdfs, hdfs-client
Affects Versions: 2.7.0, 2.6.0
 Environment: hadoop 2.6.0  

  dfs.client.hedged.read.threadpool.size
  512 



  dfs.client.hedged.read.threshold.millis
  300 

Reporter: muyannian
 Attachments: 1.jpg, 2.jpg, 3.jpg, 4.jpg, 
DFSInputStream-afterpatch.java, DFSInputStream-beforepatch.java, 
DFSInputStream.java.patch

when i used hdfs  hedged read , i found DFSInputStream hang on 
getFirstToComplete method.
the reason is when something has exception on datanode,or namenode , for 
example FileNotFoundException, that may cause hang up for ever. future has 
finished but still call get "future = hedgedService.take()" method ,so cause 
hang up.
in the attatch file is my jstack and java patch.



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