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From "Barnabas Maidics (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-13752) fs.Path stores file path in java.net.URI causes big memory waste
Date Wed, 31 Oct 2018 20:29:01 GMT

     [ https://issues.apache.org/jira/browse/HDFS-13752?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Barnabas Maidics updated HDFS-13752:
------------------------------------
    Attachment:     (was: HDFS-13752 - HDFS benchmark .pdf)

> 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
>    Affects Versions: 2.7.6
>         Environment: Hive 2.1.1 and hadoop 2.7.6 
>            Reporter: Barnabas Maidics
>            Priority: Major
>         Attachments: HDFS-13752.001.patch, HDFS-13752.002.patch, HDFS-13752.003.patch,
HDFSbenchmark.pdf, Screen Shot 2018-07-20 at 11.12.38.png, heapdump-100000partitions.html,
measurement.pdf
>
>
> 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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