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From "Toby Jungen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1093) BinaryMemtable interface silently dropping data.
Date Sat, 24 Jul 2010 02:18:52 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12891909#action_12891909
] 

Toby Jungen commented on CASSANDRA-1093:
----------------------------------------

Applied and tested the patch, appears to solve the problem. Haven't run multiple tests yet
to make sure, but looks good so far. Obviously, this slows down the write, but that's an acceptable
loss. It's likely still faster and more efficient than using the thrift API.

I'll be out of my office for the next three weeks, but I'll try to test more when I get back.
Feel free to mark as resolved in the mean time.

> BinaryMemtable interface silently dropping data.
> ------------------------------------------------
>
>                 Key: CASSANDRA-1093
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1093
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: Linux Centos5, Fedora Core 4. Java HotSpot Server 1.6.0_14. See
readme for more details.
>            Reporter: Toby Jungen
>            Assignee: Jonathan Ellis
>            Priority: Minor
>             Fix For: 0.6.4
>
>         Attachments: 1093.txt, cassandra_bmt_test.tar.gz
>
>
> I've been attempting to use the Binary Memtable (BMT) interface to load a large number
of rows. During my testing, I discovered that on larger loads (~1 million rows), occasionally
some of the data never appears in the database. This happens in a non-deterministic manner,
as sometimes all the data loads fine, and other times a significant chunk goes missing. No
errors are ever logged to indicate a problem. I'm attaching some sample code that approximates
my application's usage of Cassandra and explains this bug in more detail.

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