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Date: Thu, 15 Sep 2016 20:29:20 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (ACCUMULO-4177) TinyLFU-based BlockCache
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archived-at: Thu, 15 Sep 2016 20:29:22 -0000


    [ https://issues.apache.org/jira/browse/ACCUMULO-4177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15494436#comment-15494436 ] 

Hadoop QA commented on ACCUMULO-4177:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} xml {color} | {color:blue} 0m 3s {color} | {color:blue} jrunscript was not available. {color} |
| {color:red}-1{color} | {color:red} pre-patch {color} | {color:red} 0m 0s {color} | {color:red} JAVA_HOME is not defined. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12802787/ACCUMULO-4177.patch |
| JIRA Issue | ACCUMULO-4177 |
| Optional Tests |  asflicense  xml  javac  javadoc  unit  compile  findbugs  checkstyle  |
| uname | Linux asf906.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /home/jenkins/jenkins-slave/workspace/PreCommit-ACCUMULO-Build/test_framework/yetus-0.3.0/lib/precommit/personality/accumulo.sh |
| git revision | master / c48a2ba |
| Console output | https://builds.apache.org/job/PreCommit-ACCUMULO-Build/41/console |
| Powered by | Apache Yetus 0.3.0   http://yetus.apache.org |


This message was automatically generated.


> TinyLFU-based BlockCache
> ------------------------
>
>                 Key: ACCUMULO-4177
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4177
>             Project: Accumulo
>          Issue Type: Improvement
>    Affects Versions: 2.0.0
>            Reporter: Ben Manes
>             Fix For: 2.0.0
>
>         Attachments: ACCUMULO-4177.patch
>
>
> [LruBlockCache|https://github.com/apache/accumulo/blob/master/core/src/main/java/org/apache/accumulo/core/file/blockfile/cache/LruBlockCache.java] appears to be based on HBase's. I currently have a patch being reviewed in [HBASE-15560|https://issues.apache.org/jira/browse/HBASE-15560] that replaces the pseudo Segmented LRU with the TinyLFU eviction policy. That should allow the cache to make [better predictions|https://github.com/ben-manes/caffeine/wiki/Efficiency] based on frequency and recency, such as improved scan resistance. The implementation uses [Caffeine|https://github.com/ben-manes/caffeine], the successor to Guava's cache, to provide concurrency and keep the patch small.
> Full details are in the JIRA ticket. I think it should be easy to port if there is interest.


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