Return-Path: X-Original-To: apmail-hbase-dev-archive@www.apache.org Delivered-To: apmail-hbase-dev-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 38DC717C02 for ; Thu, 10 Sep 2015 23:56:47 +0000 (UTC) Received: (qmail 51163 invoked by uid 500); 10 Sep 2015 23:56:46 -0000 Delivered-To: apmail-hbase-dev-archive@hbase.apache.org Received: (qmail 50933 invoked by uid 500); 10 Sep 2015 23:56:46 -0000 Mailing-List: contact dev-help@hbase.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@hbase.apache.org Delivered-To: mailing list dev@hbase.apache.org Received: (qmail 50743 invoked by uid 99); 10 Sep 2015 23:56:46 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 10 Sep 2015 23:56:46 +0000 Date: Thu, 10 Sep 2015 23:56:46 +0000 (UTC) From: "Andrew Purtell (JIRA)" To: dev@hbase.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Created] (HBASE-14404) Backport HBASE-14098 (Allow dropping caches behind compactions) to 0.9 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 Andrew Purtell created HBASE-14404: -------------------------------------- Summary: Backport HBASE-14098 (Allow dropping caches behind compactions) to 0.9 Key: HBASE-14404 URL: https://issues.apache.org/jira/browse/HBASE-14404 Project: HBase Issue Type: Task Reporter: Andrew Purtell Assignee: Andrew Purtell Fix For: 0.98.15 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)