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From ткаленко кирилл <tkalkir...@yandex.ru>
Subject Re: Exceeding the DataStorageConfiguration#getMaxWalArchiveSize due to historical rebalance
Date Tue, 04 May 2021 16:01:19 GMT
Hi Ilya!

Then we can greatly reduce the user load on the cluster until the rebalance is over. Which
can be critical for the user.

04.05.2021, 18:43, "Ilya Kasnacheev" <ilya.kasnacheev@gmail.com>:
> Hello!
> Maybe we can have a mechanic here similar (or equal) to checkpoint based
> write throttling?
> So we will be throttling for both checkpoint page buffer and WAL limit.
> Regards,
> --
> Ilya Kasnacheev
> вт, 4 мая 2021 г. в 11:29, ткаленко кирилл <tkalkirill@yandex.ru>:
>>  Hello everybody!
>>  At the moment, if there are partitions for the rebalance for which the
>>  historical rebalance will be used, then we reserve segments in the WAL
>>  archive (we do not allow cleaning the WAL archive) until the rebalance for
>>  all cache groups is over.
>>  If a cluster is under load during the rebalance, WAL archive size may
>>  significantly exceed limits set in
>>  DataStorageConfiguration#getMaxWalArchiveSize until the process is
>>  complete. This may lead to user issues and nodes may crash with the "No
>>  space left on device" error.
>>  default 0.5, which sets the threshold (multiplied by getMaxWalArchiveSize)
>>  from which and up to which the WAL archive will be cleared, i.e. sets the
>>  size of the WAL archive that will always be on the node. I propose to
>>  replace this system property with the
>>   DataStorageConfiguration#getWalArchiveSize in bytes, the default is
>>  (getMaxWalArchiveSize * 0.5) as it is now.
>>  Main proposal:
>>  When theDataStorageConfiguration#getMaxWalArchiveSize is reached, cancel
>>  and do not give the reservation of the WAL segments until we reach
>>  DataStorageConfiguration#getWalArchiveSize. In this case, if there is no
>>  segment for historical rebalance, we will automatically switch to full
>>  rebalance.

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