Quanlong Huang created IMPALA-12491:
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Summary: Document whether the remote data cache has TTL
Key: IMPALA-12491
URL: https://issues.apache.org/jira/browse/IMPALA-12491
Project: IMPALA
Issue Type: Documentation
Reporter: Quanlong Huang
It's unclear to the users whether the remote data cache has TTL so will expire
after some time. We have document about the startup flags of remote data cache,
including the capacity and the eviction policy:
[https://impala.apache.org/docs/build/html/topics/impala_data_cache.html]
We should also mention that the cache item won't expire as long as the same
file metadata is used in the query. The reason is that the cache key is
(filename, mtime, file offset) where mtime is the last modified time of the
file. When the mtime in the file metadata doesn't change, the scan request
could always hit the cache (if capacity is enough).
CC [~shajini], [~joemcdonnell]
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