James Taylor created PHOENIX-3744:
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Summary: Support snapshot scanners
Key: PHOENIX-3744
URL: https://issues.apache.org/jira/browse/PHOENIX-3744
Project: Phoenix
Issue Type: Bug
Reporter: James Taylor
HBase support scanning over snapshots, with a SnapshotScanner that accesses the
region directly in HDFS. We should make sure that Phoenix can support that.
Not sure how we'd want to decide when to run a query over a snapshot. Some
ideas:
- if there's an SCN set (i.e. the query is running at a point in time in the
past)
- if the memstore is empty
- if the query is being run at a timestamp earlier than any memstore data
- as a config option on the table
- as a query hint
- based on some kind of optimizer rule (i.e. based on estimated # of bytes that
will be scanned)
Phoenix typically runs a query at the timestamp at which it was compiled. Any
data committed after this time should not be seen while a query is running.
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