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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7142) Implement a 2Q eviction strategy for HDFS-6581
Date Fri, 06 Jan 2017 22:03:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15805921#comment-15805921
] 

Hadoop QA commented on HDFS-7142:
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| (x) *{color:red}-1 overall{color}* |
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|| 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 10s{color} | {color:red}
HDFS-7142 does not apply to trunk. Rebase required? Wrong Branch? See https://wiki.apache.org/hadoop/HowToContribute
for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-7142 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12674624/HDFS-7142.003.patch
|
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/18065/console |
| Powered by | Apache Yetus 0.5.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Implement a 2Q eviction strategy for HDFS-6581
> ----------------------------------------------
>
>                 Key: HDFS-7142
>                 URL: https://issues.apache.org/jira/browse/HDFS-7142
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: 2.7.0
>            Reporter: Colin P. McCabe
>            Assignee: Colin P. McCabe
>         Attachments: 0002-Add-RamDiskReplica2QTracker.patch, HDFS-7142.003.patch
>
>
> We should implement a 2Q or approximate 2Q eviction strategy for HDFS-6581.  It is well
known that LRU is a poor fit for scanning workloads, which HDFS may often encounter. 



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