Geoffrey Jacoby created HBASE-23602:
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Summary: TTL Before Which No Data is Purged
Key: HBASE-23602
URL: https://issues.apache.org/jira/browse/HBASE-23602
Project: HBase
Issue Type: New Feature
Reporter: Geoffrey Jacoby
HBase currently offers operators a choice. They can set KEEP_DELETED_CELLS=true
and VERSIONS to max value, plus no TTL, and they will always have a complete
history of all changes (but high storage costs and penalties to read
performance). Or they can have KEEP_DELETED_CELLS=false and VERSIONS/TTL set to
some reasonable values, but that means that major compactions can destroy the
ability to do a consistent snapshot read of any prior time. (This limits the
usefulness and correctness of, for example, Phoenix's SCN lookback feature.)
I propose having a new TTL property to give a minimum age that an expired or
deleted Cell would have to achieve before it could be purged. (I see that
HBASE-10118 already does something similar for the delete markers themselves.)
This would allow operators to have a consistent history for some finite amount
of recent time while still purging out the "long tail" of obsolete / deleted
versions.
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