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https://issues.apache.org/jira/browse/CASSANDRA-5239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13662182#comment-13662182
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Vijay edited comment on CASSANDRA-5239 at 5/20/13 6:16 PM:
-----------------------------------------------------------
{quote}
What kind of slowness did you observed?
{quote}
Before:
Averages from the middle 80% of values:
interval_op_rate : 15788
interval_key_rate : 15788
latency median : 0.9
latency 95th percentile : 1.7
latency 99.9th percentile : 1440.9
Total operation time : 00:01:59
END
After:
Averages from the middle 80% of values:
interval_op_rate : 14164
interval_key_rate : 14164
latency median : 0.7
latency 95th percentile : 2.0
latency 99.9th percentile : 2804.3
Total operation time : 00:02:11
PS: this was on my laptop and not on real hardware... I did that to do some
sanity check.
{quote}
The other solution would be to use the stress tool of
https://github.com/datastax/java-driver
{quote}
Tried, but at-least i was not able to make that work (I could have done
something dumb :)).
was (Author: vijay2...@yahoo.com):
{quote}
What kind of slowness did you observed?
{quote}
After:
Averages from the middle 80% of values:
interval_op_rate : 15788
interval_key_rate : 15788
latency median : 0.9
latency 95th percentile : 1.7
latency 99.9th percentile : 1440.9
Total operation time : 00:01:59
END
Before:
Averages from the middle 80% of values:
interval_op_rate : 19740
interval_key_rate : 19740
latency median : 1.2
latency 95th percentile : 4.6
latency 99.9th percentile : 112.3
Total operation time : 00:00:47
END
PS: this was on my laptop and not on real hardware... I did that to do some
sanity check.
{quote}
The other solution would be to use the stress tool of
https://github.com/datastax/java-driver
{quote}
Tried, but at-least i was not able to make that work (I could have done
something dumb :)).
> Fully Aysnc Server Transport (StorageProxy Layer)
> -------------------------------------------------
>
> Key: CASSANDRA-5239
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5239
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Affects Versions: 2.0
> Reporter: Vijay
> Assignee: Vijay
> Priority: Minor
> Fix For: 2.0
>
>
> Problem Statement:
> Currently we have "rpc_min_threads, rpc_max_threads"/
> "native_transport_min_threads/native_transport_max_threads" all of the
> threads in the TPE are blocking and takes resources, the threads are mostly
> sleeping. Increasing the Context switch costs.
> Details:
> We should change StorageProxy methods to provide a callback which contains
> the location where the results has to be written. When the response arrive
> StorageProxy callback can write the results directly into the connection.
> Timeouts can be handled in the same way.
> Fixing Netty should be trivial with some refactor in the storage proxy
> (currently it is one method call for sending the request and waiting) we need
> callback.
> Fixing Thrift may be harder because thrift calls the method and expects a
> return value. We might need to write a custom Codec on Netty for thrift
> support, which can potentially do callbacks (A Custom codec may be similar to
> http://engineering.twitter.com/2011/04/twitter-search-is-now-3x-faster_1656.html
> but we dont know details about it). Another option is to update thrift to
> have a callback.
> FYI, The motivation for this ticket is from another project which i am
> working on with similar Proxy (blocking Netty transport) and making it Async
> gave us 2x throughput improvement.
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