[
https://issues.apache.org/jira/browse/MAPREDUCE-5044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15291977#comment-15291977
]
Eric Payne commented on MAPREDUCE-5044:
---------------------------------------
[~mingma], thank you for your reply and explanation.
{quote}
- signalContainers was initially suggested as an ordered list of
signalContainer. So it could include requests from the same container or
requests from different containers. It is true that the only use case we know
of so far is to include requests from the same container.
{quote}
In that case, do we want to call it something like {{signalsToContainers}}? I'm
open for ideas.
{quote}
- Will the required in the protocol buffer definition create any issue if we do
rolling upgrade from 2.8 to 2.9 and the 2.9 MR AM might send a list of
SignalContainerCommandProto to 2.8 NM? Maybe 2.8 NM just discards the message,
not a big deal. Regardless, that is a separate issue that we don't need to
address it here.
{quote}
Yes, this is a concern and something we need to look into more deeply and keep
in mind.
> Have AM trigger jstack on task attempts that timeout before killing them
> ------------------------------------------------------------------------
>
> Key: MAPREDUCE-5044
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5044
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: mr-am
> Affects Versions: 2.1.0-beta
> Reporter: Jason Lowe
> Assignee: Gera Shegalov
> Attachments: MAPREDUCE-5044.008.patch, MAPREDUCE-5044.009.patch,
> MAPREDUCE-5044.v01.patch, MAPREDUCE-5044.v02.patch, MAPREDUCE-5044.v03.patch,
> MAPREDUCE-5044.v04.patch, MAPREDUCE-5044.v05.patch, MAPREDUCE-5044.v06.patch,
> MAPREDUCE-5044.v07.local.patch, Screen Shot 2013-11-12 at 1.05.32 PM.png,
> Screen Shot 2013-11-12 at 1.06.04 PM.png
>
>
> When an AM expires a task attempt it would be nice if it triggered a jstack
> output via SIGQUIT before killing the task attempt. This would be invaluable
> for helping users debug their hung tasks, especially if they do not have
> shell access to the nodes.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: mapreduce-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: mapreduce-issues-h...@hadoop.apache.org
