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https://issues.apache.org/jira/browse/CASSANDRA-9207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14499879#comment-14499879
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Philip Thompson commented on CASSANDRA-9207:
--------------------------------------------
Are you sure that all 1573 records were unique? Did you perform {{Select
Count(\*) from table-name}} prior to the {{COPY TO}} command?
> COPY FROM command does not restore all records
> ----------------------------------------------
>
> Key: CASSANDRA-9207
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9207
> Project: Cassandra
> Issue Type: Bug
> Components: Core, Tools
> Environment: centOs, cassandra 2.1.1
> Reporter: Gaurav
> Labels: COPY, cqlsh
> Fix For: 2.1.5
>
>
> Steps to reproduce:
> 1. run COPY TO command on keyspace A. (on my environment problem occurred on
> only 1 table out of 19, only thing that io noticed is this table has >1500
> records and other tables has <1000 records)
> 2. pull the csv file and place it on machine (say machine B)where other
> database resides. (In my case this was another instance of amazon machine)
> 3. Now, run the COPY TO command on machine B. (both keyspaces, one on machine
> A and one on machine B has same schema.)
> Observation:
> 1. when COPY TO command is run for table having records > 1500. Command gave
> following output:
> Processing 1000 records
> 1573 records copied.
> but when i tried to verify it by running below mentioned commands, i received
> only 273 records.
> 1. SELECT COUNT(*) FROM table-name;
> 2. SELECT * FROM table-name;
> Note: please let me know if other information needs to be shared with you.
> Also, is there any other way to take the back-up of keyspace and restoring it
> on other machine.
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