[ 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. > -- This message was sent by Atlassian JIRA (v7.6.3#76005)