Wang, Gang created PARQUET-1542:
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Summary: Merge multiple IO to one time IO in method readFooter
Key: PARQUET-1542
URL: https://issues.apache.org/jira/browse/PARQUET-1542
Project: Parquet
Issue Type: Improvement
Components: parquet-mr
Reporter: Wang, Gang
Currently in method readFooter of class ParquetFileReader, it will invoke
method *converter.readParquetMetadata.* To decode file metadata, there may be
** quite a number of times of IO processing underlying, which may heavily slow
down parquet read performance.
A better way is to read all the footer bytes in a single IO, since we have
already got footer length before, and pass down all the bytes to underlying*.*
And we have a test in our environment, this change may bring 50 percent
improvement for some cases.
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