Mailing-List: contact core-dev-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
Reply-To: core-dev@hadoop.apache.org
Message-ID: <1140179561.1238130351310.JavaMail.jira@brutus>
Date: Thu, 26 Mar 2009 22:05:51 -0700 (PDT)
From: "schubert zhang (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: =?utf-8?Q?[jira]_Commented:_(HADOOP-5407)_Sometime?=
 =?utf-8?Q?s,_Reduce_tasks_hang=EF=BC=8C_State_is_unassigned?=
In-Reply-To: <518239703.1236235076125.JavaMail.jira@brutus>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable


    [ https://issues.apache.org/jira/browse/HADOOP-5407?page=3Dcom.atlassia=
n.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D126=
89808#action_12689808 ]=20

schubert zhang commented on HADOOP-5407:
----------------------------------------

There is another issue in 0.19.1 for taskTracker.

HADOOP-5269
HADOOP-5235
HADOOP-5367

I am using branch-0.19, it's fine.

> Sometimes, Reduce tasks hang=EF=BC=8C State is unassigned
> -------------------------------------------------
>
>                 Key: HADOOP-5407
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5407
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.19.0
>            Reporter: ZhuGuanyin
>
> Hi, all
> When our cluster runs for a long time, some reduce tasks running on some =
tasktrackers hang. Their states are UNASSIGNED.  Then, all reduce tasks on =
these tasktracker will hang.
> We kill the hang reduce task, then the reduce task attempt is re-schedule=
d to this tasktracker, the attempt task continues to hang. We fail it, it g=
oes to another tasktracker, it is executed successfully.=20
> Tasktracker which has hang reduce task will receive new reduce task, but =
the reduce  task continue to hang for ever.
> When we reboot the tasktracker machine, reduce task no longer hangs.

--=20
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.