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From Ivan Rakov <ivan.glu...@gmail.com>
Subject Re: IGNITE-8111: Add extra validation for WAL segment size
Date Mon, 02 Apr 2018 16:58:48 GMT
Denis,

The topic is about a possible minimum only.
Our default for WAL segment size is 64mb and we are not going to change 
it (at least under this ticket).

Best Regards,
Ivan Rakov

On 02.04.2018 19:51, Denis Magda wrote:
> Ivan,
>
> Will his value be used as a default one as well or only is a possible
> minimum? As for the defaults, I see that Postgres and Cassandra set 16mb as
> a default segment size:
> https://www.postgresql.org/docs/9.1/static/wal-configuration.html
> https://www.enterprisedb.com/docs/en/10.0/EPAS_Guide_v10/EDB_Postgres_Advanced_Server_Guide.1.45.html
>
> Should we have the same defaults?
>
> --
> Denis
>
>
> On Mon, Apr 2, 2018 at 9:16 AM, Ivan Rakov <ivan.glukos@gmail.com> wrote:
>
>> Igniters,
>>
>> We've bumped into situation when using extremely small (<10 pages) WAL
>> segment size caused unobvious errors and assertions:
>> https://issues.apache.org/jira/browse/IGNITE-8111
>> Let's reach a consensus on which value of WAL segment size should be
>> considered as minimum. I tried tests with 128kb WAL segment and they didn't
>> fail.
>> Keeping a little reserve, I propose 512kb as minimum allowable WAL segment
>> size. I don't know why anyone may need a lesser value.
>>
>> Please share your thoughts and let know if you have objections on 512kb.
>>
>> --
>> Best Regards,
>> Ivan Rakov
>>
>>


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