You are viewing a plain text version of this content. The canonical link for it is here.
Posted to hdfs-issues@hadoop.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2017/06/20 22:40:00 UTC
[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider
to enable stale read from Standby
[ https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16056592#comment-16056592 ]
Hadoop QA commented on HDFS-10702:
----------------------------------
| (x) *{color:red}-1 overall{color}* |
\\
\\
|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 6s{color} | {color:red} HDFS-10702 does not apply to trunk. Rebase required? Wrong Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
\\
\\
|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-10702 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12846654/HDFS-10702.007.patch |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/19972/console |
| Powered by | Apache Yetus 0.5.0-SNAPSHOT http://yetus.apache.org |
This message was automatically generated.
> Add a Client API and Proxy Provider to enable stale read from Standby
> ---------------------------------------------------------------------
>
> Key: HDFS-10702
> URL: https://issues.apache.org/jira/browse/HDFS-10702
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Jiayi Zhou
> Assignee: Sean Mackrory
> Priority: Minor
> Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch, HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch, HDFS-10702.006.patch, HDFS-10702.007.patch, StaleReadfromStandbyNN.pdf
>
>
> Currently, clients must always talk to the active NameNode when performing any metadata operation, which means active NameNode could be a bottleneck for scalability. One way to solve this problem is to send read-only operations to Standby NameNode. The disadvantage is that it might be a stale read.
> Here, I'm thinking of adding a Client API to enable/disable stale read from Standby which gives Client the power to set the staleness restriction.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
---------------------------------------------------------------------
To unsubscribe, e-mail: hdfs-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: hdfs-issues-help@hadoop.apache.org