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Posted to dev@parquet.apache.org by "Wang, Gang (JIRA)" <ji...@apache.org> on 2019/02/27 08:06:00 UTC

[jira] [Updated] (PARQUET-1542) Merge multiple I/O to one time I/O in method readFooter

     [ https://issues.apache.org/jira/browse/PARQUET-1542?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wang, Gang updated PARQUET-1542:
--------------------------------
    Summary: Merge multiple I/O to one time I/O in method readFooter  (was: Merge multiple IO to one time IO in method readFooter)

> Merge multiple I/O to one time I/O 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
>            Priority: Major
>
> 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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