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https://issues.apache.org/jira/browse/HADOOP-3859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12620269#action_12620269
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Raghu Angadi commented on HADOOP-3859:
--------------------------------------
+1. Looks good to me. I don't see any advantage not to make it a configurable.
> 1000 concurrent read on a single file failing the task/client
> ---------------------------------------------------------------
>
> Key: HADOOP-3859
> URL: https://issues.apache.org/jira/browse/HADOOP-3859
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.17.1
> Environment: 0.17.2
> (0.17.1-H3002-H3633-H3681-H3685-H3370-H3707-H3760-H3758)
> Reporter: Koji Noguchi
> Assignee: Johan Oskarsson
> Priority: Blocker
> Fix For: 0.17.2
>
> Attachments: HADOOP-3859.patch
>
>
> After fixing Hadoop-3633, some users started seeing their tasks fail with
> {noformat}
> 08/07/29 05:13:07 INFO mapred.JobClient: Task Id :
> task_200807290511_0001_m_000846_0, Status : FAILED
> java.io.IOException: Could not obtain block: blk_-7893038518783920880
> file=/tmp/files111
> at
> org.apache.hadoop.dfs.DFSClient$DFSInputStream.chooseDataNode(DFSClient.java:1430)
> at
> org.apache.hadoop.dfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:1281)
> at
> org.apache.hadoop.dfs.DFSClient$DFSInputStream.read(DFSClient.java:1385)
> at java.io.DataInputStream.read(DataInputStream.java:83)
> at
> org.apache.hadoop.mapred.LineRecordReader$LineReader.backfill(LineRecordReader.java:88)
> at
> org.apache.hadoop.mapred.LineRecordReader$LineReader.readLine(LineRecordReader.java:114)
> at
> org.apache.hadoop.mapred.LineRecordReader.<init>(LineRecordReader.java:179)
> at
> org.apache.hadoop.mapred.TextInputFormat.getRecordReader(TextInputFormat.java:50)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:211)
> at
> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2122)
> {noformat}
> This happened when hundreds of mappers pulled the same file concurrently.
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