hive-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-16979) Cache UGI for metastore
Date Wed, 13 Jun 2018 22:55:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-16979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Dai updated HIVE-16979:
------------------------------
    Attachment: HIVE-16979.4.patch

> Cache UGI for metastore
> -----------------------
>
>                 Key: HIVE-16979
>                 URL: https://issues.apache.org/jira/browse/HIVE-16979
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Tao Li
>            Assignee: Daniel Dai
>            Priority: Major
>         Attachments: HIVE-16979.1.patch, HIVE-16979.2.patch, HIVE-16979.3.patch, HIVE-16979.4.patch
>
>
> FileSystem.closeAllForUGI is called per request against metastore to dispose UGI, which
involves talking to HDFS name node and is time consuming. So the perf improvement would be
caching and reusing the UGI.
> Per FileSystem.closeAllForUG call could take up to 20 ms as E2E latency against HDFS.
Usually a Hive query could result in several calls against metastore, so we can save up to
50-100 ms per hive query.



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

Mime
View raw message