hawq-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Alexander Denissov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HAWQ-1622) Cache PXF proxy UGI so that cleanup of FileSystem cache does't have to be done on each request
Date Fri, 01 Jun 2018 00:11:00 GMT

     [ https://issues.apache.org/jira/browse/HAWQ-1622?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alexander Denissov updated HAWQ-1622:
-------------------------------------
    Component/s: PXF

> Cache PXF proxy UGI so that cleanup of FileSystem cache does't have to be done on each
request
> ----------------------------------------------------------------------------------------------
>
>                 Key: HAWQ-1622
>                 URL: https://issues.apache.org/jira/browse/HAWQ-1622
>             Project: Apache HAWQ
>          Issue Type: Improvement
>          Components: PXF
>            Reporter: Alexander Denissov
>            Assignee: Radar Lei
>            Priority: Major
>
> Closing PXF proxy UGIs on each request (implemented in HAWQ-1621) slows down PXF request
response time significantly when several threads work concurrently as it locks FileSystem
cache and holds the lock while the cleanup of DFSClients is completed.
> This can be avoided by caching the proxy UGI for a given proxy user between requests.
Care must be taken to remove the cached entry after some pre-defined TTL if and only if there
are no current threads using any FileSystem entries held by the cache. A combination of TTL-based
cache with ref-counting might be utilized to achieve this.
>  
> For some example of this, see: 
> https://github.com/apache/oozie/blob/master/core/src/main/java/org/apache/oozie/service/UserGroupInformationService.java
> Caching UGIs might be tricky when Kerberos support is implemented later, see: https://issues.apache.org/jira/browse/HIVE-3098?focusedCommentId=13398979&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-13398979



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

Mime
View raw message