hadoop-common-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "sunhaitao (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-12707) key of FileSystem inner class Cache contains UGI.hascode which uses the defualt hascode method, leading to the memory leak
Date Thu, 14 Jan 2016 02:59:39 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-12707?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

sunhaitao updated HADOOP-12707:
-------------------------------
    Description: 
FileSystem.get(conf) method,By default it will get the fs object from CACHE,But the key of
the CACHE  constains ugi.hashCode, which uses the default hascode method of subject instead
of the hascode method overwritten by subject.
   @Override
      public int hashCode() {
        return (scheme + authority).hashCode() + ugi.hashCode() + (int)unique;
      }
In this case, even if same user, if the calll FileSystem.get(conf) twice, two different key
will be created. In long duartion, this will lead to memory leak.

  was:
FileSystem.get(conf) method,By default it will get the fs object from CACHE,But the key of
the CACHE 
   @Override
      public int hashCode() {
        return (scheme + authority).hashCode() + ugi.hashCode() + (int)unique;
      }


> key of FileSystem inner class Cache contains UGI.hascode which uses the defualt hascode
method, leading to the memory leak
> --------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-12707
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12707
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 2.7.1
>            Reporter: sunhaitao
>            Assignee: sunhaitao
>
> FileSystem.get(conf) method,By default it will get the fs object from CACHE,But the key
of the CACHE  constains ugi.hashCode, which uses the default hascode method of subject instead
of the hascode method overwritten by subject.
>    @Override
>       public int hashCode() {
>         return (scheme + authority).hashCode() + ugi.hashCode() + (int)unique;
>       }
> In this case, even if same user, if the calll FileSystem.get(conf) twice, two different
key will be created. In long duartion, this will lead to memory leak.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message