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From "Konstantin Shvachko (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2422) The NN should tolerate the same number of low-resource volumes as failed volumes
Date Tue, 11 Oct 2011 08:10:29 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13124792#comment-13124792
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Konstantin Shvachko commented on HDFS-2422:
-------------------------------------------

Sounds like soft NFS mounts should be avoided as the integrity is the priority for edits and
image. CRCs would help to detect corruption, but we need to guarantee that each record is
written, flushed, and synced. Thanks Srivas.
                
> The NN should tolerate the same number of low-resource volumes as failed volumes
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-2422
>                 URL: https://issues.apache.org/jira/browse/HDFS-2422
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.24.0
>            Reporter: Jeff Bean
>            Assignee: Aaron T. Myers
>             Fix For: 0.24.0
>
>         Attachments: HDFS-2422.patch
>
>
> We encountered a situation where the namenode dropped into safe mode after a temporary
outage of an NFS mount.
> At 12:10 the NFS server goes offline
> Oct  8 12:10:05 <namenode> kernel: nfs: server <nfs host> not responding,
timed out
> This caused the namenode to conclude resource issues:
> 2011-10-08 12:10:34,848 WARN org.apache.hadoop.hdfs.server.namenode.NameNodeResourceChecker:
Space available on volume '<nfs host>' is 0, which is below the configured reserved
amount 104857600
> Temporary loss of NFS mount shouldn't cause safemode.

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