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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1989) When checkpointing by backup node occurs parallely when a file is being closed by a client then Exception occurs saying no journal streams.
Date Wed, 15 Jun 2011 17:41:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13049914#comment-13049914
] 

Todd Lipcon commented on HDFS-1989:
-----------------------------------

my point is that the client cannot issue a close() at this time, because the BNN has diverted
its logs from "apply" mode to "spool" mode, and clients don't talk directly to the BN.

> When checkpointing by backup node occurs parallely when a file is being closed by a client
then Exception occurs saying no journal streams. 
> --------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1989
>                 URL: https://issues.apache.org/jira/browse/HDFS-1989
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.23.0
>            Reporter: ramkrishna.s.vasudevan
>             Fix For: 0.23.0
>
>
> Backup namenode initiates the checkpointing process. 
> As a part of checkpointing based on the timestamp it tries to download the FSImage or
use the existing one.
> Then it tries to save the FSImage.
> During this time it tries to close the editLog streams.
> Parallely when a client tries to close a file just after the checkpointing process closes
the editLog Stream then we get an exception saying
> java.io.IOException: java.lang.IllegalStateException: !!! WARNING !!! File system changes
are not persistent. No journal streams.
> Here the saveNameSpace api closes all the editlog streams resulting in this issue.
>  

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