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https://issues.apache.org/jira/browse/CASSANDRA-1093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12867933#action_12867933
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Chris Goffinet commented on CASSANDRA-1093:
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I've never seen this happen and I've done many imports. At the very end of the 
import, are you calling nodetool flush <Keyspace> ? 

> 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
>             Fix For: 0.6.2
>
>         Attachments: 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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