Return-Path: X-Original-To: apmail-hadoop-hdfs-issues-archive@minotaur.apache.org Delivered-To: apmail-hadoop-hdfs-issues-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id BCFDF177A8 for ; Wed, 6 May 2015 03:30:19 +0000 (UTC) Received: (qmail 5412 invoked by uid 500); 6 May 2015 03:30:19 -0000 Delivered-To: apmail-hadoop-hdfs-issues-archive@hadoop.apache.org Received: (qmail 5353 invoked by uid 500); 6 May 2015 03:30:19 -0000 Mailing-List: contact hdfs-issues-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: hdfs-issues@hadoop.apache.org Delivered-To: mailing list hdfs-issues@hadoop.apache.org Received: (qmail 5338 invoked by uid 99); 6 May 2015 03:30:19 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 06 May 2015 03:30:19 +0000 Date: Wed, 6 May 2015 03:30:19 +0000 (UTC) From: "Allen Wittenauer (JIRA)" To: hdfs-issues@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (HDFS-7142) Implement a 2Q eviction strategy for HDFS-6581 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)