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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-2174) commit durring backup of more then 10 seconds causes snapshoot to fail ?
Date Mon, 18 Oct 2010 20:44:30 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12922247#action_12922247
] 

Hoss Man commented on SOLR-2174:
--------------------------------

Note: i personally don't fully understand the issue, but i noticed the message was unreplied
and had a patch so i wanted to make sure if got tracked in Jira

> commit durring backup of more then 10 seconds causes snapshoot to fail ?
> ------------------------------------------------------------------------
>
>                 Key: SOLR-2174
>                 URL: https://issues.apache.org/jira/browse/SOLR-2174
>             Project: Solr
>          Issue Type: Bug
>          Components: replication (java)
>    Affects Versions: 1.4.1
>            Reporter: Hoss Man
>
> Comment from Peter Sturge in email...
> http://lucene.472066.n3.nabble.com/commitReserveDuration-backups-and-saveCommitPoint-td1407399.html
> {quote}
> In Solr 1.4 and 1.4.1, the SOLR-1475 patch is certainly there, but I don't believe it
truly addresses the problem.
> Here's why:
> When a 'backup' command is received by the RemplicationHandler, it creates a SnapShooter
instance and asynchronously does a full file snapshot of the current commit point.
> The current commit version to which this refers, however, is set to be cleared on the
next commit by the value of 'commitReserveDuration', which, by default, is set to 10secs.
(see cleanReserves() in IndexDeletionPolicyWrapper.java).
> If you perform a backup and no commits occur during this time, it's fine, because clearReserves()
is not called. If you do get a commit during the backup process, and the backup takes longer
than 10secs,
> the whole snapshot operation fails (because delete() doesn't see the commit point in
savedCommits - see below).
> {quote}
> Peter's email mentions two patches that he believes will fix this problem

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