[jira] [Created] (HDFS-13752) fs.Path stores file path in java.net.URI causes big memory waste

["Barnabas Maidics (JIRA)" <ji...@apache.org>]

Barnabas Maidics created HDFS-13752:
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             Summary: fs.Path stores file path in java.net.URI causes big memory waste
                 Key: HDFS-13752
                 URL: https://issues.apache.org/jira/browse/HDFS-13752
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: fs
            Reporter: Barnabas Maidics
         Attachments: Screen Shot 2018-07-20 at 11.12.38.png

I was looking at HiveServer2 memory usage, and a big percentage of this was because of org.apache.hadoop.fs.Path, where you store file paths in a java.net.URI object. The URI implementation stores the same string in 3 different objects (see the attached image). In Hive when there are many partitions this cause a big memory usage. In my particular case 42% of memory was used by java.net.URI so it could be reduced to 14%. 

I wonder if the community is open to replace it with a more memory efficient implementation and what other things should be considered here? It can be a huge memory improvement for Hadoop and for Hive as well.



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