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From "Marcus Eriksson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10421) Potential issue with LogTransaction as it only checks in a single directory for files
Date Thu, 01 Oct 2015 10:43:26 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14939662#comment-14939662
] 

Marcus Eriksson commented on CASSANDRA-10421:
---------------------------------------------

Actually 6696 was why I stumbled on this, for two reasons:

* I want to model flushing as a single transaction - this means writing files to different
data directories under a single txn. I guess this could be done as multiple transactions though
* Compaction will at times need to write to multiple directories - after say range movements
or disk additions (to rebalance the tokens over the disks again)

> Potential issue with LogTransaction as it only checks in a single directory for files
> -------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-10421
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10421
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Marcus Eriksson
>            Assignee: Stefania
>
> When creating a new LogTransaction we try to create the new logfile in the same directory
as the one we are writing to, but as we use {{[directories.getDirectoryForNewSSTables()|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/db/lifecycle/LogTransaction.java#L125]}}
this might end up in "any" of the configured data directories. If it does, we will not be
able to clean up leftovers as we check for files in the same directory as the logfile was
created: https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/db/lifecycle/LogRecord.java#L163
> cc [~Stefania]



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