sankalp kohli created CASSANDRA-7359:
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Summary: Optimize locking in PaxosState
Key: CASSANDRA-7359
URL: https://issues.apache.org/jira/browse/CASSANDRA-7359
Project: Cassandra
Issue Type: Improvement
Reporter: sankalp kohli
Priority: Minor
In PaxosState, we want to lock on same rows and have created 1024 size array
with java Objects in them to be used for locking.
We should replace these Objects with some Lock so that we can know whether
there is contention trying to acquire a lock for different rows.
We can achieve that by also storing the hash of the row which acquired the
lock. This will tell us if this needs to be improved.
Here is an improvement which I was thinking about.
Say two rows A and B map to the same 1024 bucket which we have. A get the lock
and B has to wait. Here B can check if his hash is different and create a new
object and chain it to the other one.
This looks close to a hashMap with chaining for same key.
The hard part will be removing the entries no longer being used.
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