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https://issues.apache.org/jira/browse/PARQUET-1542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16779022#comment-16779022
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ASF GitHub Bot commented on PARQUET-1542:
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wangshisan commented on pull request #624: [PARQUET-1542] Merge multiple I/O to
one time I/O in method readFooter
URL: https://github.com/apache/parquet-mr/pull/624
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 I/O processing underlying, which may heavily slow
down parquet read performance.
A better way is to read all the footer bytes in a single I/O, 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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> Merge multiple I/O to one time I/O when read footer
> ---------------------------------------------------
>
> Key: PARQUET-1542
> URL: https://issues.apache.org/jira/browse/PARQUET-1542
> Project: Parquet
> Issue Type: Improvement
> Components: parquet-mr
> Reporter: Wang, Gang
> Priority: Major
> Labels: pull-request-available
>
> 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 I/O processing underlying, which may heavily
> slow down parquet read performance.
> A better way is to read all the footer bytes in a single I/O, 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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