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From "Devaraj K (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-3034) NM should act on a REBOOT command from RM
Date Wed, 01 Feb 2012 12:06:59 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3034?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Devaraj K updated MAPREDUCE-3034:

    Attachment: MAPREDUCE-3034-1.patch

* Major:
** {{NodeManager.stateChanged()}}:
*** In the case of {{STATE.STOPPED}} *both* {{stop()}} and {{reboot()}} need to be called.
*** I don't see anywhere in the call hierarchy where {{NodeManager.stop()}} is ever called
in the reboot case.
*** Following the logic through, it looks like this is the call sequence from your patch:
**** {{NodeStatusUpdaterImpl.startStatusUpdater().run()}}
***** calls: {{NodeStatusUpdaterImpl.reboot()}}
***** calls: {{AbstractService.stop()}}
***** calls: {{AbstractService.changeState()}}
***** calls: {{NodeManager.stateChanged()}}
***** Which *does not* call {{NodeManager.stop()}} if {{NodeStatusUpdaterImpl.isRebooted}}
is set.
stop() was calling from reboot method. Anyway now I have moved it to common for SHUTDOWN and
REBOOT cases.


** {{NodeManager}}:
*** In order for the new private static variable {{nodeManager}} to be fully effective, you
should take out the local {{NodeManager}} declaration within {{main()}}. Otherwise, the new
{{getNodeManager()}} method won't always return the NodeManager instance.
It was added only for reboot testability purpose. Now I have refactored the code.

** Please look into the new findbugs and core test failures.
These test failures are not related to this patch.

* Minor:
** {{NodeManager.main()}} / {{NodeManager.reboot()}}:
*** Rather than copy the same code from {{main()}} into the new {{reboot()}} method, I would
create a common method (call it {{commonNMMain}}, for example). You will probably need a parameter
flag to tell you whether or not this is called from {{main()}} or from {{reboot()}}.
I have refactored the code accordingly.

** {{NodeManager.reboot()}}:
*** You should handle the case where {{nodeManagerShutdownHook}} is {{null}}. Even though
it should not be {{null}}, if it is {{null}}, you should create a new instance of it.
There will not be a case where it will be null. This condition is added only for test purpose.

** {{NodeManager.reboot()}}:
*** Rather than calling {{getConfig()}} when calling {{nodeManager.init()}}, I would argue
that it would be better to create a new instance of conf so that any updates to the NM configs
will be picked up. I guess it could be argued the other way, too. That is, you could make
the case that the grid owner doesn't want the NM configs to change just because the RM was
restarted. However, I think it should be a new NM config because the RM will have a new config.
I don't feel it is a good idea to reload the configuration when the NM gets rebooted. If the
user want to update any property then they should restart the NM manually.

** {{NodeStatusUpdaterImpl}}:
*** {{YarnRPC rpc;}} is declared but never used.
It was my mistake, I was doing some thing and forgot to remove. I have updated now.

** {{TestNodeStatusUpdater}}:
*** I don't see where it is testing the RM-restart / NM-reboot case.
This test case verifies that when NM gets reboot signal, current instance will be stopped
and new instance will be started successfully.
> NM should act on a REBOOT command from RM
> -----------------------------------------
>                 Key: MAPREDUCE-3034
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3034
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2, nodemanager
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Devaraj K
>            Priority: Critical
>         Attachments: MAPREDUCE-3034-1.patch, MAPREDUCE-3034.patch, MR-3034.txt
> RM sends a reboot command to NM in some cases, like when it gets lost and rejoins back.
In such a case, NM should act on the command and reboot/reinitalize itself.
> This is akin to TT reinitialize on order from JT. We will need to shutdown all the services
properly and reinitialize - this should automatically take care of killing of containers,
cleaning up local temporary files etc.

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