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Posted to hdfs-issues@hadoop.apache.org by "Barnabas Maidics (JIRA)" <ji...@apache.org> on 2018/10/31 13:11:00 UTC
[jira] [Updated] (HDFS-13752) fs.Path stores file path in
java.net.URI causes big memory waste
[ https://issues.apache.org/jira/browse/HDFS-13752?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Barnabas Maidics updated HDFS-13752:
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Attachment: 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 - HDFS benchmark .pdf, HDFS-13752.001.patch, HDFS-13752.002.patch, HDFS-13752.003.patch, 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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