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Date: Sun, 13 Oct 2013 17:15:42 +0000 (UTC)
From: "Yuki Morishita (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Message-ID: <JIRA.12670359.1380057090707.57675.1381684542673@arcas>
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Subject: [jira] [Commented] (CASSANDRA-6092) Leveled Compaction after ALTER
 TABLE creates pending but does not actually begin
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    [ https://issues.apache.org/jira/browse/CASSANDRA-6092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13793717#comment-13793717 ] 

Yuki Morishita commented on CASSANDRA-6092:
-------------------------------------------

So we are not adding functionality to break up huge single SSTable when switching to LCS, right?
(I'm not a huge fan of it since it adds complexity to picking LCS candidates imho.)

> Leveled Compaction after ALTER TABLE creates pending but does not actually begin
> --------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-6092
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6092
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Cassandra 1.2.10
> Oracle Java 1.7.0_u40
> RHEL6.4
>            Reporter: Karl Mueller
>            Assignee: Jonathan Ellis
>             Fix For: 1.2.11
>
>         Attachments: 6092.txt
>
>
> Running Cassandra 1.2.10.  N=5, RF=3
> On this Column Family (ProductGenomeDev/Node), it's been major compacted into a single, large sstable.
> There's no activity on the table at the time of the ALTER command. I changed it to Leveled Compaction with the command below.
> cqlsh:ProductGenomeDev> alter table "Node" with compaction = { 'class' : 'LeveledCompactionStrategy', 'sstable_size_in_mb' : 160 };
> Log entries confirm the change happened.
> [...]column_metadata={},compactionStrategyClass=class org.apache.cassandra.db.compaction.LeveledCompactionStrategy,compactionStrategyOptions={sstable_size_in_mb=160} [...]
> nodetool compactionstats shows pending compactions, but there's no activity:
> pending tasks: 750
> 12 hours later, nothing has still happened, same number pending. The expectation would be that compactions would proceed immediately to convert everything to Leveled Compaction as soon as the ALTER TABLE command goes.
> I try a simple write into the CF, and then flush the nodes. This kicks off compaction on 3 nodes. (RF=3)
> cqlsh:ProductGenomeDev> insert into "Node" (key, column1, value) values ('test123', 'test123', 'test123');
> cqlsh:ProductGenomeDev> select * from "Node" where key = 'test123';
>  key     | column1 | value
> ---------+---------+---------
>  test123 | test123 | test123
> cqlsh:ProductGenomeDev> delete from "Node" where key = 'test123';
> After a flush on every node, now I see:
> [cassandra@dev-cass00 ~]$ cas exec nt compactionstats
> *** dev-cass00 (0) ***
> pending tasks: 750
> Active compaction remaining time :        n/a
> *** dev-cass04 (0) ***
> pending tasks: 752
>           compaction type        keyspace   column family       completed           total      unit  progress
>                CompactionProductGenomeDev            Node      3413333881    643290447928     bytes     0.53%
> Active compaction remaining time :        n/a
> *** dev-cass01 (0) ***
> pending tasks: 750
> Active compaction remaining time :        n/a
> *** dev-cass02 (0) ***
> pending tasks: 751
>           compaction type        keyspace   column family       completed           total      unit  progress
>                CompactionProductGenomeDev            Node      3374975141    642764512481     bytes     0.53%
> Active compaction remaining time :        n/a
> *** dev-cass03 (0) ***
> pending tasks: 751
>           compaction type        keyspace   column family       completed           total      unit  progress
>                CompactionProductGenomeDev            Node      3591320948    643017643573     bytes     0.56%
> Active compaction remaining time :        n/a
> After inserting and deleting more columns, enough that all nodes have new data, and flushing, now compactions are proceeding on all nodes.


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