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From "Steinmaurer, Thomas" <thomas.steinmau...@dynatrace.com>
Subject Cassandra 2.1.18 - Question on stream/bootstrap throughput
Date Tue, 22 Oct 2019 10:47:13 GMT
Hello,

using 2.1.8, 3 nodes (m4.10xlarge, ESB SSD-based), vnodes=256, RF=3, we are trying to add
a 4th node.

The two options to my knowledge, mainly affecting throughput, namely stream output and compaction
throttling has been set to very high values (e.g. stream output = 800 Mbit/s resp. compaction
throughput = 500 Mbyte/s) or even set to 0 (unthrottled) in cassandra.yaml + process restart.
In both scenarios (throttling with high values vs. unthrottled), the 4th node is streaming
from one node capped ~ 180-200Mbit/s, according to our SFM.

The nodes have plenty of resources available (10Gbit, disk io/iops), also confirmed by e.g.
iperf in regard to NW throughput and write to / read from disk in the area of 200 MByte/s.

Are there any other known throughput / bootstrap limitations, which basically outrule above
settings?

Thanks,
Thomas


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