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From "Sumanth Pasupuleti (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-14765) Evaluate Recovery Time on Single Token Cluster Test
Date Fri, 12 Oct 2018 15:45:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16648053#comment-16648053
] 

Sumanth Pasupuleti commented on CASSANDRA-14765:
------------------------------------------------

Live document with comparisons on streaming upon termination between 3.0.x and 4.0 clusters.
https://docs.google.com/document/d/1nB7_rvO14GHao-oqywjQs7lIDSodYZTjoxbo8rRpxv0/edit#

> Evaluate Recovery Time on Single Token Cluster Test
> ---------------------------------------------------
>
>                 Key: CASSANDRA-14765
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14765
>             Project: Cassandra
>          Issue Type: Sub-task
>            Reporter: Joseph Lynch
>            Assignee: Sumanth Pasupuleti
>            Priority: Major
>
> *Setup:*
>  * Cassandra: 6 (2*3 rack) node i3.8xlarge AWS instance (32 cpu cores, 240GB ram) running
cassandra trunk with Jason's 14503 changes vs the same footprint running 3.0.17
>  * One datacenter, single tokens
>  * No compression, encryption, or coalescing turned on
> *Test #1:*
> ndbench loaded ~150GB of data per node into a LCS table. Then we killed a node and let
a new node stream. With a single token this should be a worst case recovery scenario (only 
a few peers to stream from).
> *Result:*
> As the table used LCS and we didn't not have encryption on, the zero copy transfer was
used via CASSANDRA-14556. We recovered *150GB in 5 minutes,* going at a consistent rate of
about 3 gigabit per second. Theoretically we should be able to get 10 gigabit, but this is
still something like an estimated 16x improvement over 3.0.x. We're still running the 3.0.x
test for a hard comparison.
> *Follow Ups:*
> We need to get more rigorous measurements (over more terminations), as well as finishing
the 3.0.x test. [~sumanth.pasupuleti] and [~djoshi3] are driving this.



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