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From "Koji Noguchi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2159) Namenode stuck in safemode
Date Wed, 21 May 2008 22:51:55 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12598841#action_12598841
] 

Koji Noguchi commented on HADOOP-2159:
--------------------------------------

We also had one cluster that didn't come out of safemode.

fsck showed, 
{noformat}
Status: HEALTHY
 Total dirs:    270001
 Total files:   1036456
 Total blocks:  1982902 (avg. block size 92619603 B)
 Minimally replicated blocks:   1982902 (100.00001 %)
 Over-replicated blocks:        0 (0.0 %)
 Under-replicated blocks:       0 (0.0 %)
 Mis-replicated blocks:         0 (0.0 %)
 Default replication factor:    3
 Average block replication:     3.0000212
 Missing replicas:              0 (0.0 %)
The filesystem under path '/' is HEALTHY
{noformat}

I attached btrace to obtain the state of Namenode.namesystem.safeMode, 

{noformat}
-bash-3.1$ pgrep -f NameNode
30490

-bash-3.1$ btrace -cp hadoop-core.jar 30490 DFSSafeModeTrace.java
entered org.apache.hadoop.dfs.FSNamesystem.isInSafeMode

org.apache.hadoop.dfs.FSNamesystem@3c992fa5
{threshold=1.0, extension=30000, safeReplication=1, reached=0, blockTotal=1982902, blockSafe=1982812,
this$0=org.apache.hadoop.dfs.FSNamesystem@3c992fa5, }
{noformat}

This shows that blockSafe <  blockTotal, which supports Hairong's comment above.

(dfs.safemode.threshold.pct is set to 1.0f)

> Namenode stuck in safemode
> --------------------------
>
>                 Key: HADOOP-2159
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2159
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.16.0
>            Reporter: Christian Kunz
>
> Occasionally (not easy to reproduce) the namenode does turn off safemode automatically,
although fsck does not report any missing or under-replicated blocks (safemode threshold set
to 1.0).
> At this moment I do not have any additional information which could help analyze the
issue.

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