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From Steven Wu <stevenz...@gmail.com>
Subject Re: HDD or SSD or EBS for kafka brokers in Amazon EC2
Date Tue, 02 Jun 2015 17:07:30 GMT
EBS (network attached storage) has got a lot better over the last a few
years. we don't quite trust it for kafka workload.

At Netflix, we were going with the new d2 instance type (HDD). our
perf/load testing shows it satisfy our workload. SSD is better in latency
curve but pretty comparable in terms of throughput. we can use the extra
space from HDD for longer retention period.

On Tue, Jun 2, 2015 at 9:37 AM, Henry Cai <hcai@pinterest.com.invalid>
wrote:

> We have been hosting kafka brokers in Amazon EC2 and we are using EBS
> disk.  But periodically we were hit by long I/O wait time on EBS in some
> Availability Zones.
>
> We are thinking to change the instance types to a local HDD or local SSD.
> HDD is cheaper and bigger and seems quite fit for the Kafka use case which
> is mostly sequential read/write, but some early experiments show the HDD
> cannot catch up with the message producing speed since there are many
> topic/partitions on the broker which actually makes the disk I/O more
> randomly accessed.
>
> How are people's experience of choosing disk types on Amazon?
>

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