hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8865) Improve quota initialization performance
Date Fri, 07 Aug 2015 21:05:46 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8865?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kihwal Lee updated HDFS-8865:
-----------------------------
    Attachment: HDFS-8865.patch

> Improve quota initialization performance
> ----------------------------------------
>
>                 Key: HDFS-8865
>                 URL: https://issues.apache.org/jira/browse/HDFS-8865
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>         Attachments: HDFS-8865.patch
>
>
> After replaying edits, the whole file system tree is recursively scanned in order to
initialize the quota. For big name space, this can take a very long time.  Since this is done
during namenode failover, it also affects failover latency.
> By using the Fork-Join framework, I was able to greatly reduce the initialization time.
 The following is the test result using the fsimage from one of the big name nodes we have.
> || threads || seconds||
> | 1 (existing) | 55|
> | 1 (fork-join) | 68 |
> | 4 | 16 |
> | 8 | 8 |
> | 12 | 6 |
> | 16 | 5 |
> | 20 | 4 |



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

Mime
View raw message