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https://issues.apache.org/jira/browse/CASSANDRA-6616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13881426#comment-13881426
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Brandon Williams commented on CASSANDRA-6616:
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This is because the CFs are being processed sequentially. CASSANDRA-6566 may
help some, but if all of these CFs did have data, processing them in parallel
would be detrimental to IO. It would be better to have much less CFs.
> Nodetool repair is taking a long time.
> ---------------------------------------
>
> Key: CASSANDRA-6616
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6616
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: Cassandra Version 2.0.4 running on Redhat Version 6
> Reporter: Dharsan Logendran
>
> We have a two nodes cluster with the replication factor of 2. The db has
> more than 2500 column families(tables). The 'nodetool -pr -par' repair on
> an empty database(one or table has a litter data) takes about 30 hours to
> complete.
>
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