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From kurt Greaves <k...@instaclustr.com>
Subject Re: Rebuilding with vnodes
Date Thu, 03 Nov 2016 02:09:04 GMT
If the network and both DC's can handle the load it's fine (the new DC
would . You'll want to keep an eye on the logs for streaming failures, as
it's not always completely clear and you could end up with missing data.
You should definitely be aware that rebuilds affect the source DC, so if
it's under load you want to be careful of impacting it.

I'm not sure that memtable_cleanup_threshold affects streamed SSTables,
seems unlikely that the streamed SSTables would also be added to memtables,
however obviously your DC would be receiving writes simultaneously. 0.7
seems quite high, what are your heap settings and memtable_flush_writers?

Kurt Greaves
kurt@instaclustr.com
www.instaclustr.com

On 2 November 2016 at 19:59, Anubhav Kale <Anubhav.Kale@microsoft.com>
wrote:

> Hello,
>
>
>
> I am trying to rebuild a new Data Center with 50 Nodes, and expect 1 TB /
> node. Nodes are backed by SSDs, and the rebuild is happening from another
> DC in same physical region. This is with 2.1.13.
>
>
>
> I am doing this with stream_throughput=200 MB, concurrent_compactors=256,
> compactionthroughput=0, and memtable_cleanup_threshold=0.7. (memtable
> setting was necessary to keep # SSTable files in check) and running rebuild
> 20 nodes at a time.
>
>
>
> Have people generally attempted to do such large rebuilds ? Any tips ?
>
>
>
> Thanks !
>
>
>

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