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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1603) Replication gets set to 1 sometimes when Namenode restarted.
Date Fri, 13 Jul 2007 23:23:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12512648
] 

Raghu Angadi commented on HADOOP-1603:
--------------------------------------

Someone please double check what I have found till now. It looks like it exists in 13 also.

Before HADOOP-702, FSEditLog.adjustReplication() used to take conf as argument before. Not
it just relies on min/max Replication  variables set in FSNamesystem object. But secondary
name node uses a bare minimum which does have these variables set. So whenever Secondary namenode
rolls the FSImage, it resets replication to 0 and when Namenode reads it in the next restart,
it sets it to 1.

In my developement, for some reason many times Secondary Namenode never finishes creating
new Image or it has some other exception.. never checked secondary namenode log till now.
So this problem didn't always show up.


> Replication gets set to 1 sometimes when Namenode restarted.
> ------------------------------------------------------------
>
>                 Key: HADOOP-1603
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1603
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.14.0
>            Reporter: Raghu Angadi
>            Assignee: Raghu Angadi
>            Priority: Blocker
>             Fix For: 0.14.0
>
>
> I have seen this with at least 3-4 weeks old trunk. It is not very deterministic but
when the cluster restarts all files get their replication reset to 1. It is not deterministic
but not very hard  to reproduce. I could reproduce this on a small cluster. I will add more
details. 

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