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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4045) Increment checkpoint if we see failures in rollEdits
Date Sat, 28 Mar 2009 01:36:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12690162#action_12690162
] 

Konstantin Shvachko commented on HADOOP-4045:
---------------------------------------------

# {{FSImage.setCheckpointTime()}} variable {{al}} is not used.
# {{processIOError(ArrayList<StorageDirectory> sds)}} may be eliminated.
# I would also get rid of {{processIOError(ArrayList<EditLogOutputStream> errorStreams)}}.
The point is that it is better to have only one processIOError in each class, otherwise it
can get
as bad as it is now with all different variants of it.
If you think it is a lot of changes, then lets at least make both of them private.
# Do we want to make {{removedStorageDirs}} a map in order to avoid adding the same directory

twice into it or does it never happen?
# Same with {{Storage.storageDirs}}. If we search in a collection then we might want to use
searchable collections. This may be done in a separate issue.
# It's somewhat confusing: {{FSImage.processIOError()}} calls {{editLog.processIOError()}}
and
then {{FSEditLog.processIOError()}} calls {{fsimage.processIOError()}}. Is it going to converge
at some point?
# {{setCheckpointTime()}} ignores io errors. Just mentioning this, I don't see how to avoid
it.
Failed streams/directories will be remove next time flushAndSync() called.

> Increment checkpoint if we see failures in rollEdits
> ----------------------------------------------------
>
>                 Key: HADOOP-4045
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4045
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Lohit Vijayarenu
>            Assignee: Boris Shkolnik
>            Priority: Critical
>             Fix For: 0.19.2
>
>         Attachments: HADOOP-4045-1.patch, HADOOP-4045.patch
>
>
> In _FSEditLog::rollEdits_, if we encounter an error during opening edits.new, we remove
 the store directory associated with it. At this point we should also increment checkpoint
on all other directories.

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