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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1161) Make DN minimum valid volumes configurable
Date Wed, 19 May 2010 21:01:54 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12869341#action_12869341
] 

Eli Collins commented on HDFS-1161:
-----------------------------------

bq. The Unit test should ideally not hardcode the 15 second wait time (instead wait indefinitely).


It needs to wait at least that long to get the necessary heart beats, but I think it is reasonable
to put that check in a loop so that in the case when heartbeats are delayed in the test the
test is robust to that.

bq. also, can we achieve the behaviour that Koji wants using the existing config parameters
(instead of creating new config parameters)?

There are no existing configuration parameters for this, just a constant hard-coded to 1,
so we need to add one.

> Make DN minimum valid volumes configurable
> ------------------------------------------
>
>                 Key: HDFS-1161
>                 URL: https://issues.apache.org/jira/browse/HDFS-1161
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>    Affects Versions: 0.21.0, 0.22.0
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>             Fix For: 0.21.0, 0.22.0
>
>         Attachments: hdfs-1161-1.patch, hdfs-1161-2.patch, hdfs-1161-3.patch, hdfs-1161-4.patch
>
>
> The minimum number of non-faulty volumes to keep the DN active is hard-coded to 1.  It
would be useful to allow users to configure this value so the DN can be taken offline when
eg half of its disks fail, otherwise it doesn't get reported until it's down to it's final
disk and suffering degraded performance.

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