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https://issues.apache.org/jira/browse/IGNITE-8017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16420428#comment-16420428
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Ilya Lantukh commented on IGNITE-8017:
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[~avinogradov],
We're disabling WAL when node doesn't have OWNING partitions and enabling it
right before changing state to OWNING.
> Disable WAL during initial preloading
> -------------------------------------
>
> Key: IGNITE-8017
> URL: https://issues.apache.org/jira/browse/IGNITE-8017
> Project: Ignite
> Issue Type: Improvement
> Reporter: Ilya Lantukh
> Assignee: Ilya Lantukh
> Priority: Major
> Labels: iep-16
> Fix For: 2.5
>
>
> While handling SupplyMessage, node handles each supplied data entry
> separately, which causes a WAL record for each entry to be written. It
> significantly limits preloading speed.
> We can improve rebalancing speed and reduce pressure on disk by disabling WAL
> until all data is loaded. The disadvantage of this approach is that data
> might get corrupted if node crashes - but node that crashed during preloading
> has to clear all it's data anyway. However, it is important to distinguish
> situations when new node joined cluster or added to baseline topology (and
> doesn't hold any data) and when additional partitions got assigned to node
> after baseline topology changed (in this case node has to keep all data in
> consistent state).
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