.
From: Shishir Kumar
Reply-To: "user@cassandra.apache.org"
Date: Wednesday, December 4, 2019 at 8:04 AM
To: "user@cassandra.apache.org"
Subject: Re: "Maximum memory usage reached (512.000MiB), cannot allocate chunk
of 1.000MiB"
Message from External Sender
Corr
>>>
>>>>
>>>>
>>>> One thing you’ll find out pretty quickly. There are a lot of knobs you
>>>> can turn with C*, too many to allow for easy answers on what you should
>>>> do. Figure out what your throughput and latency
ould
>>> do. Figure out what your throughput and latency SLAs are, and you’ll know
>>> when to stop tuning. Otherwise you’ll discover that it’s a rabbit hole you
>>> can dive into and not come out of for weeks.
>>>
>>>
>>>
>>>
>>&
@cassandra.apache.org>>
Date: Monday, December 2, 2019 at 10:35 AM
To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>"
mailto:user@cassandra.apache.org>>
Subject: Re: "Maximum memory usage reached (512.000MiB), cannot allocate chunk
of
and latency SLAs are, and you’ll know
>> when to stop tuning. Otherwise you’ll discover that it’s a rabbit hole you
>> can dive into and not come out of for weeks.
>>
>>
>>
>>
>>
>> *From: *Hossein Ghiyasi Mehr
>> *Reply-To: *&
ber 2, 2019 at 10:35 AM
> *To: *"user@cassandra.apache.org"
> *Subject: *Re: "Maximum memory usage reached (512.000MiB), cannot
> allocate chunk of 1.000MiB"
>
>
>
> *Message from External Sender*
>
> It may be helpful:
> https://thelastpickle.c
ot;user@cassandra.apache.org"
> *Date: *Monday, December 2, 2019 at 10:35 AM
> *To: *"user@cassandra.apache.org"
> *Subject: *Re: "Maximum memory usage reached (512.000MiB), cannot
> allocate chunk of 1.000MiB"
>
>
>
> *Message from External Sender*
dive into
and not come out of for weeks.
From: Hossein Ghiyasi Mehr
Reply-To: "user@cassandra.apache.org"
Date: Monday, December 2, 2019 at 10:35 AM
To: "user@cassandra.apache.org"
Subject: Re: "Maximum memory usage reached (512.000MiB), cannot allocate chunk
of 1.000Mi
It may be helpful:
https://thelastpickle.com/blog/2018/08/08/compression_performance.html
It's complex. Simple explanation, cassandra keeps sstables in memory based
on chunk size and sstable parts. It manage loading new sstables to memory
based on requests on different sstables correctly . You shou
Hello Rahul,
I would request Hossein to correct me if I am wrong. Below is how it works
How will a application/database read something from the disk
A request comes in for read> the application code internally would be
invoking upon system calls-> these kernel level system calls will
sche
Thanks Hossein,
How does the chunks are moved out of memory (LRU?) if it want to make room
for new requests to get chunks?if it has mechanism to clear chunks from
cache what causes to cannot allocate chunk? Can you point me to any
documention?
On Sun, Dec 1, 2019, 12:03 PM Hossein Ghiyasi Mehr
w
Chunks are part of sstables. When there is enough space in memory to cache
them, read performance will increase if application requests it again.
Your real answer is application dependent. For example write heavy
applications are different than read heavy or read-write heavy. Real time
application
Hello,
We are seeing memory usage reached 512 mb and cannot allocate 1MB. I see
this because file_cache_size_mb by default set to 512MB.
Datastax document recommends to increase the file_cache_size.
We have 32G over all memory allocated 16G to Cassandra. What is the
recommended value in my case
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