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Posted to common-dev@hadoop.apache.org by "Raghu Angadi (JIRA)" <ji...@apache.org> on 2008/09/16 23:45:46 UTC
[jira] Issue Comment Edited: (HADOOP-3859) 1000 concurrent read on
a single file failing the task/client
[ https://issues.apache.org/jira/browse/HADOOP-3859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12631565#action_12631565 ]
rangadi edited comment on HADOOP-3859 at 9/16/08 2:45 PM:
---------------------------------------------------------------
As you can see in HADOOP-3633, it was conscious decision not to make this configurable. I didn't even try to make it public in this jira. It is expected to be a private config variable. Do we have any reasons to make it public (I can think of a couple I guess)?
was (Author: rangadi):
As you can see in HADOOP-3633, it was conscious decision not to make this configurable. I didn't even try to make it public in this jira. It was expected to be a private config variable. Do we have any reasons to make it public (I can think of a couple I guess)?
> 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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