HiveInputFormat or CombineHiveInputFormat always sync blocks of RCFile twice
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Key: HIVE-1801
URL: https://issues.apache.org/jira/browse/HIVE-1801
Project: Hive
Issue Type: Improvement
Reporter: Siying Dong
Assignee: Siying Dong
HiveInputFormat or CombineHiveInputFormat RCFile.Reader.sync() twice. One in
getReader() and one in initIOContext(). We can avoid the latter one by read the
sync() position of the former one.
We also sync() twice for SequenceFile but since SequenceFileReader is not a
part of Hive code, maybe we should be careful when depending on the
implementation.
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