Details
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Improvement
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Resolution: Unresolved
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Major
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5.1.0
Description
Currently replicateTo latency degrades significantly when Rebalance is going on (especially p99 and p99.9).
There is a new feature to set DCP stream priorities: MB-11640. Rebalance backfill phase should use it so as to lower its priority compared to replication traffic. Here is a suggestion from Dave Rigby:
- The rebalance stream (backfill in particular?) could be initially set at medium priority; increased to high later. Medium would put the backfill phase alongside GSI etc - which in fact is probably fair as they are also classed as front-end operations. When it later changes to in-memory state the priority could be restored to high.
- Variant - we could even set backfill phaser to low priority; given it is a bulk operation which isn't latency sensitive.
Attachments
Issue Links
- relates to
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MB-11640 Provide ability to set the DCP stream priority (low/high)
- Resolved