hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7457) DatanodeID generates excessive garbage
Date Tue, 02 Dec 2014 12:42:12 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7457?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsz Wo Nicholas Sze updated HDFS-7457:
--------------------------------------
    Hadoop Flags: Reviewed

+1 patch looks good.

> DatanodeID generates excessive garbage
> --------------------------------------
>
>                 Key: HDFS-7457
>                 URL: https://issues.apache.org/jira/browse/HDFS-7457
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.0.0-alpha, 3.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HDFS-7457.patch
>
>
> {{DatanodeID#getXferAddr}} is a dynamically generated string.  This string is repeatedly
generated for the hash code, equality, comparisons, and stringification.  Every DN->NN
RPC method calls {{DatanodeManager#getDatanode}} to validate if the node is registered, which
involves a call to {{getXferAddr}}.
> The dynamic computation generates unnecessary trash that puts unnecessary pressure on
the GC.



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

Mime
View raw message