Michael Smith 15b07ff1fb
IMPALA-11704: (Addendum) fix crash on open for HDFS cache ...
When trying to read from HDFS cache, ReadFromCache calls
FileReader::Open(false) to force the file to open. The prior commit for
IMPALA-11704 didn't allow for that case when using a data cache, as the
data cache check would always happen. This resulted in a crash calling
CachedFile as exclusive_hdfs_fh_ was nullptr. Tests only catch this when
reading from HDFS cache with data cache enabled.
Replaces explicit arguments to override FileReader behavior with a flag
to communicate whether FileReader supports delayed open. Then the caller
can choose whether to call Open before read. Also simplifies calls to
ReadFromPos as it already has a pointer to ScanRange and can check
whether file handle caching is enabled directly. The Open call in
DoInternalRead uses a slightly wider net by only checking UseDataCache.
If the data cache is unavailable or a miss the file will then be opened.
Adds a select from tpch.nation to the query for test_data_cache.py as
something that triggers checking the HDFS cache.
Change-Id: I741488d6195e586917de220a39090895886a2dc5
Reviewed-on: http://gerrit.cloudera.org:8080/19228
Reviewed-by: Joe McDonnell <joemcdonnell@cloudera.com >
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com >
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