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Date: Wed, 7 Aug 2013 10:28:48 +0000 (UTC)
From: "Alex Zarutin (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Message-ID: <JIRA.12647032.1368202079169.15483.1375871328659@arcas>
In-Reply-To: <JIRA.12647032.1368202079169@arcas>
References: <JIRA.12647032.1368202079169@arcas>
Subject: [jira] [Commented] (CASSANDRA-5555) Allow sstableloader to handle a
 larger number of files
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    [ https://issues.apache.org/jira/browse/CASSANDRA-5555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13731855#comment-13731855 ] 

Alex Zarutin commented on CASSANDRA-5555:
-----------------------------------------

Verified the fix on latest Cassandra 1.2 with about 42 thousands of SSTable files using the "how to reproduce" steps already attached. 
During the processing the files, I did not see big change in memory consumption and CPU utilization. Running the process with 256M of the memory as Java -Xmx, the real usage stayed around 140M during the entire process. 
Suggest to resolve this issue, unless we really want to test it on thousand of huge files - much bigger that 1M that we used in this test.
                
> Allow sstableloader to handle a larger number of files
> ------------------------------------------------------
>
>                 Key: CASSANDRA-5555
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5555
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core, Tools
>            Reporter: Tyler Hobbs
>            Assignee: Tyler Hobbs
>             Fix For: 1.2.7, 2.0 beta 2
>
>         Attachments: 5555-01.txt, 5555-02.txt, 5555-2.txt, 5555-fix-heap-and-streaming-1.2.patch, 5555-fix-heap-and-streaming-1.2-v2.patch, 5555-fix-heap-and-streaming-trunk.patch, cass_5555_pic_8.png, CASSANDRA-5555.txt, CASSANDRA-5555.txt, CASSANDRA-5555.txt
>
>
> With the default heap size, sstableloader will OOM when there are roughly 25k files in the directory to load.  It's easy to reach this number of files in a single LCS column family.
> By avoiding creating all SSTableReaders up front in SSTableLoader, we should be able to increase the number of files that sstableloader can handle considerably.

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