hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1077) Race condition in fetching map outputs (might lead to hung reduces)
Date Wed, 07 Mar 2007 22:48:24 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1077?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arun C Murthy updated HADOOP-1077:
----------------------------------

    Attachment: 1077.2.patch

Attaching Devaraj's patch since he is asleep by now... :)

> Race condition in fetching map outputs (might lead to hung reduces)
> -------------------------------------------------------------------
>
>                 Key: HADOOP-1077
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1077
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Devaraj Das
>         Assigned To: Devaraj Das
>            Priority: Blocker
>             Fix For: 0.12.1
>
>         Attachments: 1077.2.patch, 1077.patch
>
>
> Sometimes when a map task is lost while the map-output fetch is happening from the TT
for that task, and the lost map has successfully executed on some other node, the event for
that successful execution is lost at the fetching TT. The fetching TT might eventually fail
to fetch the output for the lost task, but then since the event for the new run of the lost
map might also have been lost, the fetching TT might hang.
> This "hung" problem was discovered while working on HADOOP-1060.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message