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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