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Posted to commits@cassandra.apache.org by "Sandeep Tata (JIRA)" <ji...@apache.org> on 2009/03/20 22:29:50 UTC
[jira] Resolved: (CASSANDRA-7) Cassandra silently loses data when a
single row gets large
[ https://issues.apache.org/jira/browse/CASSANDRA-7?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sandeep Tata resolved CASSANDRA-7.
----------------------------------
Resolution: Fixed
Fixed by svn commit: r756155
> Cassandra silently loses data when a single row gets large
> ----------------------------------------------------------
>
> Key: CASSANDRA-7
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7
> Project: Cassandra
> Issue Type: Bug
> Environment: code in trunk, Red Hat 4.1.2-33, Linux version 2.6.23.1-42.fc8, java version "1.7.0-nio2"
> Reporter: Sandeep Tata
> Priority: Critical
> Attachments: BigReadWriteTest.java, dirty_bit_patch.txt, dirty_bit_patch_v2.txt
>
>
> When you insert a large number of columns in a single row, Cassandra silently loses some of these inserts.
> This does not happen until the cumulative size of the columns in a single row exceeds several megabytes.
> Say each value is 1MB large,
> insert("row", "col0", value, timestamp)
> insert("row", "col1", value, timestamp)
> insert("row", "col2", value, timestamp)
> ...
> ...
> insert("row", "col100", value, timestamp)
> Running:
> get_column("row", "col0")
> get_column("row", "col1")
> ...
> ..
> get_column("row", "col100")
> The sequence of get_columns will fail at some point before 100. This was a problem with the old code in code.google also.
> I will attach a small program that will help you reproduce this.
> 1. This only happens when the cumulative size of the row exceeds several megabytes.
> 2. In fact, the single row should be large enough to trigger an SSTable flush to trigger this error.
> 3. No OutOfMemory errors are thrown, there is nothing relevant in the logs.
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