[Enhancement] import 2.5 enhancement #11380 port ORCHdfsFileStream to OrcScanner to… #24946
+104
−117
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Fixes #issue
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Bugfix cherry-pick branch check:
Fixes #slow broker load for orc in some bad case #11329
import 2.5 enhancement #11380 port ORCHdfsFileStream to OrcScanner to 2.3
“Class ORCHdfsFileStream has capability to do pre-read and io coalesce functionalities. However OrcScanner does not use it, which makes broker load extremly slow and do a lot of random IO.
With this enhancement, case2 can be cutdown from 35s -> 5/6s.”