[
https://issues.apache.org/jira/browse/HDFS-8865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14680076#comment-14680076
]
Kihwal Lee edited comment on HDFS-8865 at 8/10/15 1:08 PM:
-----------------------------------------------------------
New patch
- Fixed the findbug warning of unused variable.
- Fixed the test breakages. Snapshot tests were breaking because of casting ref
inode to dir. Changed it to use {{child.asDirectory()}} when generating work.
{{TestLeaseRecovery2}} and {{TestHDFSCLI}} are also passing locally.
- Addressed most checkstyle issues. A couple of them are ignored.
was (Author: kihwal):
- Fixed the findbug warning of unused variable.
- Fixed the test breakages. Snapshot tests were breaking because of casting ref
inode to dir. Changed it to use {{child.asDirectory()}} when generating work.
{{TestLeaseRecovery2}} and {{TestHDFSCLI}} are also passing locally.
- Addressed most checkstyle issues. A couple of them are ignored.
> 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, HDFS-8865.v2.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)
