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https://issues.apache.org/jira/browse/CASSANDRA-13489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shoban resolved CASSANDRA-13489.
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Resolution: Feedback Received
> Cassandra Repair in 2.2.8
> -------------------------
>
> Key: CASSANDRA-13489
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13489
> Project: Cassandra
> Issue Type: Task
> Environment: Linux Redhat Enterprise, 32 GB RAM,
> Reporter: Shoban
> Priority: Critical
>
> I am using 4 node, 2 data center Cassandra cluster. While running nodetool
> repair -dcpar it takes arund 2 hours 30 minutes for database size of 20 MB. I
> checked how to tune streaming of data between data centers from below url:
> https://support.datastax.com/hc/en-us/articles/205409646-How-to-performance-tune-data-streaming-activities-like-repair-and-bootstrap
> But still the repair takes 2 hours and 30 mins. I drilled down the repair
> logs and identified while repair Cassandra repairs 256 ranges per node which
> is 4*256=1024. In a single token range merkle tree for each column families
> is compared which takes around 110 ms. We have 80 column families thus it
> takes 110*80*1024 which results in 2 hours 30 mins.
> Can we reduce number of traffic by generating merkle tree for more than one
> column family at a time?
> Or is there any other way to reduce the repair procedure in Cassandra 2.2.
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