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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7142) Implement a 2Q eviction strategy for HDFS-6581
Date Wed, 06 May 2015 03:30:19 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7142?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Allen Wittenauer updated HDFS-7142:
-----------------------------------
    Labels: BB2015-05-TBR  (was: )

> 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 Patrick McCabe
>            Assignee: Colin Patrick McCabe
>              Labels: BB2015-05-TBR
>         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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