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From "Wendy Chien (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-442) slaves file should include an 'exclude' section, to prevent "bad" datanodes and tasktrackers from disrupting a cluster
Date Tue, 06 Feb 2007 21:44:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12470746
] 

Wendy Chien commented on HADOOP-442:
------------------------------------

To combine exclude and decommission, I've taken out the dsfadmin command decommission.  Starting
and stopping decommission is now done through configured files.  The last option in the original
decommission command was one to see the state of the decommission for a set of nodes.  Should
this option be combined with refreshNodes or should it still have it's own command (especially
if the decommission state is expanded to show progress or if we want to also show other states
for the  nodes)?

> slaves file should include an 'exclude' section, to prevent "bad" datanodes and tasktrackers
from disrupting  a cluster
> -----------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-442
>                 URL: https://issues.apache.org/jira/browse/HADOOP-442
>             Project: Hadoop
>          Issue Type: Bug
>          Components: conf
>            Reporter: Yoram Arnon
>         Assigned To: Wendy Chien
>
> I recently had a few nodes go bad, such that they were inaccessible to ssh, but were
still running their java processes.
> tasks that executed on them were failing, causing jobs to fail.
> I couldn't stop the java processes, because of the ssh issue, so I was helpless until
I could actually power down these nodes.
> restarting the cluster doesn't help, even when removing the bad nodes from the slaves
file - they just reconnect and are accepted.
> while we plan to avoid tasks from launching on the same nodes over and over, what I'd
like is to be able to prevent rogue processes from connecting to the masters.
> Ideally, the slaves file will contain an 'exclude' section, which will list nodes that
shouldn't be accessed, and should be ignored if they try to connect. That would also help
in configuring the slaves file for a large cluster - I'd list the full range of machines in
the cluster, then list the ones that are down in the 'exclude' section

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