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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 Tue, 14 Oct 2014 01:49:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14170362#comment-14170362
] 

Hadoop QA commented on HDFS-7142:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12674624/HDFS-7142.003.patch
  against trunk revision 178bc50.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:red}-1 findbugs{color}.  The patch appears to introduce 2 new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:red}-1 core tests{color}.  The patch failed these unit tests in hadoop-hdfs-project/hadoop-hdfs:

                  org.apache.hadoop.hdfs.server.namenode.TestSaveNamespace
                  org.apache.hadoop.hdfs.server.namenode.ha.TestDNFencing
                  org.apache.hadoop.hdfs.server.namenode.ha.TestDNFencingWithReplication
                  org.apache.hadoop.fs.TestFcHdfsSetUMask
                  org.apache.hadoop.fs.loadGenerator.TestLoadGenerator

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/8412//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/8412//artifact/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/8412//console

This message is 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 Patrick McCabe
>            Assignee: Colin Patrick 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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