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From Jay Zhuang <jay.zhu...@yahoo.com.INVALID>
Subject Re: CASSANDRA-9472 Reintroduce off heap memtables - patch to 3.0
Date Sat, 29 Jul 2017 17:02:53 GMT
Should we consider back-porting it to 3.0 for the community? I think
this is a performance regression instead of new feature. And we have the
feature in 2.1, 2.2.

On 7/27/17 11:52 PM, Andrew Whang wrote:
> Yes, seeing latency improvement after backporting 9472 to 3.0.13. We are
> measuring p99 latency, thus moving objects off heap improved gc stalls,
> which directly affects our read/write p99 latency.
> 
> On Thu, Jul 27, 2017 at 10:54 PM, Jeff Jirsa <jjirsa@gmail.com> wrote:
> 
>> This is after you backported 9472 to 3.0?
>>
>> --
>> Jeff Jirsa
>>
>>
>>> On Jul 27, 2017, at 10:33 PM, Andrew Whang <andrewgwhang@gmail.com>
>> wrote:
>>>
>>> Jay,
>>>
>>> We see ~20% write latency improvement on 3.0.13 in a write-heavy
>> workload,
>>> using offheap_objects. offheap_buffers only offered minimal improvement.
>>>
>>> On Thu, Jul 27, 2017 at 10:06 PM, Jay Zhuang
>> <jay.zhuang@yahoo.com.invalid>
>>> wrote:
>>>
>>>> Hi Andrew,
>>>>
>>>> Do you see performance gain from reintroducing off-heap memtables for
>>>> 3.0.x? When we were on 2.2.x we saw big improvements from enabling
>>>> off-heap memtables.
>>>>
>>>> Thanks,
>>>> Jay
>>>>
>>>>> On 7/27/17 9:37 PM, Andrew Whang wrote:
>>>>> I'm wondering if anyone has been able to patch CASSANDRA-9472 to 3.0,
>>>>> without breaking unit tests. The patch was introduced in 3.4, but 3.0.x
>>>>> contains unit tests and code from later 3.x releases, which makes
>>>> debugging
>>>>> unit test failures difficult - i.e. SSTableCorruptionDetectionTest,
>>>> which
>>>>> was introduced in 3.7 and is found in 3.0.14, but not in 3.4.
>>>>>
>>>>
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>>>>
>>
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>>
> 

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