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