[jira] [Updated] (CASSANDRA-7615) Data isn't written to the disk with enough space while using multiple data_file_directories

["David Chia (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-7615?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Chia updated CASSANDRA-7615:
----------------------------------

    Environment: 
Hardware: AWS c3.xlarge (80GB SSD) with 500GB EBS
OS: Ubuntu
Cassandra version: 1.2.16

  was:
System: AWS c3.xlarge (80GB SSD) with 500GB EBS
Cassandra version: 1.2.16


> Data isn't written to the disk with enough space while using multiple data_file_directories
> -------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-7615
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7615
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: Hardware: AWS c3.xlarge (80GB SSD) with 500GB EBS
> OS: Ubuntu
> Cassandra version: 1.2.16
>            Reporter: David Chia
>
> *Background:* The local disk on the server was running out of disk space, so I added a new volume and I added a new data directory (on the new disk) to the data_file_directories list.
> *Behavior:* I could see that some of the new sstables were flushed to this new data directory, but Cassandra was still compacting the sstables to the old disk (at least the tmp sstable was written to the old disk. I am sure whether it would move the tmp sstable later or not); eventually, it crashed with out-of-disk-space. It is not what [CASSANDRA-4292|https://issues.apache.org/jira/browse/CASSANDRA-4292?focusedCommentId=13422574&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13422574] described, unless the design decision had been changed.
> *Suspect:* It seems the precedence of the tasks number is somewhat over the free space of the volume, so it would choose less-load-and-less-space over higher-load-and-more-space ( ? )
> {code:title=https://github.com/apache/cassandra/blob/cassandra-1.2/src/java/org/apache/cassandra/db/Directories.java#L190-L199|borderStyle=solid}
>         Collections.sort(candidates);
>         // sort directories by load, in _ascending_ order.
>         Collections.sort(candidates, new Comparator<DataDirectory>()
>         {
>             public int compare(DataDirectory a, DataDirectory b)
>             {
>                 return a.currentTasks.get() - b.currentTasks.get();
>             }
>         });
> {code}
> Thanks in advance.



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