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Posted to mapreduce-issues@hadoop.apache.org by "Junping Du (JIRA)" <ji...@apache.org> on 2017/01/06 01:19:58 UTC
[jira] [Updated] (MAPREDUCE-6251) JobClient needs additional
retries at a higher level to address not-immediately-consistent dfs corner
cases
[ https://issues.apache.org/jira/browse/MAPREDUCE-6251?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Junping Du updated MAPREDUCE-6251:
----------------------------------
Fix Version/s: 2.8.0
> JobClient needs additional retries at a higher level to address not-immediately-consistent dfs corner cases
> -----------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-6251
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6251
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobhistoryserver, mrv2
> Affects Versions: 2.6.0
> Reporter: Craig Welch
> Assignee: Craig Welch
> Labels: BB2015-05-TBR
> Fix For: 2.8.0, 2.7.1, 3.0.0-alpha1
>
> Attachments: MAPREDUCE-6251.0.patch, MAPREDUCE-6251.1.patch, MAPREDUCE-6251.2.patch, MAPREDUCE-6251.3.patch, MAPREDUCE-6251.4.patch, MAPREDUCE-6251.6.patch, MAPREDUCE-6251.7.patch, MAPREDUCE-6251.8.patch, MAPREDUCE-6251.8.patch
>
>
> The JobClient is used to get job status information for running and completed jobs. Final state and history for a job is communicated from the application master to the job history server via a distributed file system - where the history is uploaded by the application master to the dfs and then scanned/loaded by the jobhistory server. While HDFS has strong consistency guarantees not all Hadoop DFS's do. When used in conjunction with a distributed file system which does not have this guarantee there will be cases where the history server may not see an uploaded file, resulting in the dreaded "no such job" and a null value for the RunningJob in the client.
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