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From Viktor Jevdokimov <>
Subject sstableloader throughput
Date Wed, 10 Apr 2013 08:12:08 GMT

We're using Casandra 1.0.12 sstableloader to import data from dedicated machine located in
DC1 into the cluster of 32 nodes (RF=4), 16 nodes in DC1 and 16 nodes in DC2.

To disable throttle for sstableloader we set in casasndra.yaml:
stream_throughput_outbound_megabits_per_sec: 0

Outgoing network throughput is about 1Gbit, file copy from dedicated sstableloader machine
throughput is >90MB/s into DC1 node and >50MB/s into DC2 node.

But with sstableloader outgoing network traffic is only 9MB/s, importing 1 sstable of 480MB
into cluster (~60MB/node) takes 8-9 minutes. Even with 50MB/s import should take less than
a minute.

Why sstableloader throughput is so low/slow?

Best regards / Pagarbiai
Viktor Jevdokimov
Senior Developer

Phone: +370 5 212 3063, Fax +370 5 261 0453
J. Jasinskio 16C, LT-01112 Vilnius, Lithuania
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