Return-Path: X-Original-To: apmail-hbase-issues-archive@www.apache.org Delivered-To: apmail-hbase-issues-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id B320517B24 for ; Thu, 24 Sep 2015 11:03:05 +0000 (UTC) Received: (qmail 41478 invoked by uid 500); 24 Sep 2015 11:03:05 -0000 Delivered-To: apmail-hbase-issues-archive@hbase.apache.org Received: (qmail 41441 invoked by uid 500); 24 Sep 2015 11:03:05 -0000 Mailing-List: contact issues-help@hbase.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Delivered-To: mailing list issues@hbase.apache.org Received: (qmail 41283 invoked by uid 99); 24 Sep 2015 11:03:05 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 24 Sep 2015 11:03:05 +0000 Date: Thu, 24 Sep 2015 11:03:05 +0000 (UTC) From: "Liu Shaohui (JIRA)" To: issues@hbase.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (HBASE-14404) Backport HBASE-14098 (Allow dropping caches behind compactions) to 0.98 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/HBASE-14404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14906199#comment-14906199 ] Liu Shaohui commented on HBASE-14404: ------------------------------------- The build failed for TestBytes was killed. {quote} Running org.apache.hadoop.hbase.util.TestBytes Killed {quote} > Backport HBASE-14098 (Allow dropping caches behind compactions) to 0.98 > ----------------------------------------------------------------------- > > Key: HBASE-14404 > URL: https://issues.apache.org/jira/browse/HBASE-14404 > Project: HBase > Issue Type: Task > Reporter: Andrew Purtell > Assignee: Liu Shaohui > Fix For: 0.98.15 > > Attachments: HBASE-14404-0.98-v3.patch, HBASE-14404-0.98.patch, HBASE-14404-0.98.patch, v3-v2.diff > > > HBASE-14098 adds a new configuration toggle - "hbase.hfile.drop.behind.compaction" - which if set to "true" tells compactions to drop pages from the OS blockcache after write. It's on by default where committed so far but a backport to 0.98 would default it to off. (The backport would also retain compat methods to LimitedPrivate interface StoreFileScanner.) What could make it a controversial change in 0.98 is it changes the default setting of 'hbase.regionserver.compaction.private.readers' from "false" to "true". I think it's fine, we use private readers in production. They're stable and do not present perf issues. -- This message was sent by Atlassian JIRA (v6.3.4#6332)