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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2011/07/19 18:08:58 UTC
[jira] [Updated] (CASSANDRA-2872) While dropping and recreating an
index, incremental snapshotting can hang
[ https://issues.apache.org/jira/browse/CASSANDRA-2872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Ellis updated CASSANDRA-2872:
--------------------------------------
Attachment: 2872.txt
> While dropping and recreating an index, incremental snapshotting can hang
> --------------------------------------------------------------------------
>
> Key: CASSANDRA-2872
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2872
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.7.4
> Reporter: Sylvain Lebresne
> Assignee: Jonathan Ellis
> Priority: Minor
> Fix For: 0.7.8, 0.8.2
>
> Attachments: 2872.txt
>
>
> When creating a hard link (at list with JNA), link() hang if the target of the
> link already exists. In theory though, we should not hit that situation
> because we use a new directory for each manual snapshot and the generation
> number of the sstables should prevent this from hapenning with increment
> snapshot.
> However, when you drop, then recreate a secondary index, if the sstables are
> deleted after the drop and before we recreate the index, the recreated index
> sstables will start with a generation to 0. Thus, when we start backuping them
> incrementally, it will conflict with the sstables of the previously dropped
> index.
> First, we should check for the target existance because calling link() to at
> least avoid hanging. But then we must make sure that when we drop, then
> recreate an index, we will either not name the sstables the same way or the
> incremental snapshot use a different directory.
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