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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7960) The full block report should prune zombie storages even if they're not empty
Date Fri, 20 Mar 2015 02:16:39 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7960?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Colin Patrick McCabe updated HDFS-7960:
---------------------------------------
    Attachment: HDFS-7960.002.patch

> The full block report should prune zombie storages even if they're not empty
> ----------------------------------------------------------------------------
>
>                 Key: HDFS-7960
>                 URL: https://issues.apache.org/jira/browse/HDFS-7960
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.6.0
>            Reporter: Lei (Eddy) Xu
>            Assignee: Colin Patrick McCabe
>            Priority: Critical
>         Attachments: HDFS-7960.002.patch
>
>
> The full block report should prune zombie storages even if they're not empty.  We have
seen cases in production where zombie storages have not been pruned subsequent to HDFS-7575.
 This could arise any time the NameNode thinks there is a block in some old storage which
is actually not there.  In this case, the block will not show up in the "new" storage (once
old is renamed to new) and the old storage will linger forever as a zombie, even with the
HDFS-7596 fix applied.  This also happens with datanode hotplug, when a drive is removed.
 In this case, an entire storage (volume) goes away but the blocks do not show up in another
storage on the same datanode.



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