Restore improvement: batch #4055
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This was the initial design, that was changed during implementation by mistake. We should always send shard_cnt * --batch-size sstables in a single restore job, even when user wants to restore into a running cluster. For this case, it should be enough to set --parallel=1 and --batch-size=1 for a slow running restore.
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This commit allows to set --batch-size=0. When this happens, batches will be created so that they contain about 5% of expected node workload during restore. This allows for creating big, yet evenly distributed batches without the need to play with the --batch-size flag. It should also work better fine when backed up cluster had different amount of nodes than the restore destination cluster. Fixes #4059
This shouldn't be possible, but we can still validate that.
This results in creating batches of sstables of more similar size. Fixes #3979
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@karol-kokoszka This PR is ready for review! |
karol-kokoszka
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This allows not to bother with small, badly distributed over shards leftover batches.
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@karol-kokoszka I addressed the comments, could you take a look again? |
karol-kokoszka
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This PR introduces the following changes to batching mechanism:
Fixes #3979
Fixes #4059