[jira] [Created] (PHOENIX-6655) SYSTEM.SEQUENCE should have CACHE_DATA_ON_WRITE set to true

["Geoffrey Jacoby (Jira)" <ji...@apache.org>]

Geoffrey Jacoby created PHOENIX-6655:
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             Summary: SYSTEM.SEQUENCE should have CACHE_DATA_ON_WRITE set to true
                 Key: PHOENIX-6655
                 URL: https://issues.apache.org/jira/browse/PHOENIX-6655
             Project: Phoenix
          Issue Type: Improvement
            Reporter: Geoffrey Jacoby


High volume use cases of Phoenix sequences need to write to the same row of SYSTEM.SEQUENCE very frequently, but each time we write, the block cache that row is in is invalidated and has to be loaded again. 

[~rushabh.shah] was looking at a case in our environment where a sequence was being used heavily and found lots of time spent reading the HFiles for the same Get of the sequence row within the SequenceRegionObserver increment coproc. 

[~apurtell] pointed out offline that HColumnDescriptor has a property, CACHE_DATA_ON_WRITE that keeps caches updated when a value is updated. This should help improve contention on sequence increments. 



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