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From "Aaron T. Myers (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2781) Add client protocol and DFSadmin for command to restore failed storage
Date Tue, 07 Feb 2012 00:08:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13201849#comment-13201849
] 

Aaron T. Myers commented on HDFS-2781:
--------------------------------------

bq. Actually the active goes into safe mode on my machine because it thinks there is not enough
space.

That's very likely a parsing error. As I recall, DF (as in, the Java class) which NameNodeResourceChecker
uses just quietly returns 0 for free space of a directory that doesn't exist:

{noformat}
$ hadoop org.apache.hadoop.fs.DF /does/not/exist
df -k null
null	0	0	0	0%	null
{noformat}
                
> Add client protocol and DFSadmin for command to restore failed storage
> ----------------------------------------------------------------------
>
>                 Key: HDFS-2781
>                 URL: https://issues.apache.org/jira/browse/HDFS-2781
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>
> Per HDFS-2769, it's important that an admin be able to ask the NN to try to restore failed
storage since we may drop into SM until the shared edits dir is restored (w/o having to wait
for the next checkpoint). There's currently an API (and usage in DFSAdmin) to flip the flag
indicating whether the NN should try to restore failed storage but not that it should actually
attempt to do so. This jira is to add one. This is useful outside HA but doing as an HDFS-1623
sub-task since it's motivated by HA.

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