Vijay created CASSANDRA-4189:
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Summary: Improve hints replay
Key: CASSANDRA-4189
URL: https://issues.apache.org/jira/browse/CASSANDRA-4189
Project: Cassandra
Issue Type: Improvement
Components: Core
Affects Versions: 1.2
Reporter: Vijay
Assignee: Vijay
Priority: Minor
Fix For: 1.2
Problem: Hints are stored in one row.
when there are a lot of hints stored and we store Tombstones for the ones which
has been replayed.
It might be worth shading the hints based on Hour at which the hints are
stored. This can reduce the complexity of the scanning for hints.
Problem: Hints replay is too slow and single threaded.
There are use-case where the hints needs to be replayed ASAP to make the
cluster more consistent.
In Multi region cluster, the throttle is already done due to the latency which
is in the order of 100's of millisecond.
It might be worth trying to replay the hints in parallel and throttle on the
number of bytes read from the disk or use the existing setting of throttle
based on sleep interval on all the threads.
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