From hdfs-issues-return-283444-archive-asf-public=cust-asf.ponee.io@hadoop.apache.org Mon Sep 16 03:48:05 2019 Return-Path: X-Original-To: archive-asf-public@cust-asf.ponee.io Delivered-To: archive-asf-public@cust-asf.ponee.io Received: from mail.apache.org (hermes.apache.org [207.244.88.153]) by mx-eu-01.ponee.io (Postfix) with SMTP id D41BC1804BB for ; Mon, 16 Sep 2019 05:48:04 +0200 (CEST) Received: (qmail 73347 invoked by uid 500); 16 Sep 2019 03:48:02 -0000 Mailing-List: contact hdfs-issues-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Delivered-To: mailing list hdfs-issues@hadoop.apache.org Received: (qmail 73317 invoked by uid 99); 16 Sep 2019 03:48:02 -0000 Received: from mailrelay1-us-west.apache.org (HELO mailrelay1-us-west.apache.org) (209.188.14.139) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 16 Sep 2019 03:48:02 +0000 Received: from jira-he-de.apache.org (static.172.67.40.188.clients.your-server.de [188.40.67.172]) by mailrelay1-us-west.apache.org (ASF Mail Server at mailrelay1-us-west.apache.org) with ESMTP id 5DE58E2F65 for ; Mon, 16 Sep 2019 03:48:01 +0000 (UTC) Received: from jira-he-de.apache.org (localhost.localdomain [127.0.0.1]) by jira-he-de.apache.org (ASF Mail Server at jira-he-de.apache.org) with ESMTP id 90F287807F8 for ; Mon, 16 Sep 2019 03:48:00 +0000 (UTC) Date: Mon, 16 Sep 2019 03:48:00 +0000 (UTC) From: "Rakesh R (Jira)" To: hdfs-issues@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (HDFS-13762) Support non-volatile storage class memory(SCM) in HDFS cache directives MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ https://issues.apache.org/jira/browse/HDFS-13762?page=3Dcom.atlassia= n.jira.plugin.system.issuetabpanels:all-tabpanel ] Rakesh R updated HDFS-13762: ---------------------------- Target Version/s: 3.3.0 Status: Open (was: Patch Available) > Support non-volatile storage class memory(SCM) in HDFS cache directives > ----------------------------------------------------------------------- > > Key: HDFS-13762 > URL: https://issues.apache.org/jira/browse/HDFS-13762 > Project: Hadoop HDFS > Issue Type: New Feature > Components: caching, datanode > Reporter: Sammi Chen > Assignee: Feilong He > Priority: Major > Attachments: HDFS-13762.000.patch, HDFS-13762.001.patch, HDFS-137= 62.002.patch, HDFS-13762.003.patch, HDFS-13762.004.patch, HDFS-13762.005.pa= tch, HDFS-13762.006.patch, HDFS-13762.007.patch, HDFS-13762.008.patch, HDFS= _Persistent_Memory_Cache_Perf_Results.pdf, SCMCacheDesign-2018-11-08.pdf, S= CMCacheDesign-2019-07-12.pdf, SCMCacheDesign-2019-07-16.pdf, SCMCacheDesign= -2019-3-26.pdf, SCMCacheTestPlan-2019-3-27.pdf, SCMCacheTestPlan.pdf > > > No-volatile storage class memory is a type of memory that can keep the da= ta content after power failure or between the power cycle. Non-volatile sto= rage class memory device usually has near access speed as memory DIMM while= has lower cost than memory.=C2=A0 So today It is usually used as a supplem= ent to memory to hold long tern persistent data, such as data in cache.=C2= =A0 > Currently in HDFS, we have OS page cache backed read only cache and RAMDI= SK based lazy write cache.=C2=A0 Non-volatile memory suits for both these f= unctions.=C2=A0 > This Jira aims to enable storage class memory first in read cache. Althou= gh storage class memory has non-volatile characteristics, to keep the same = behavior as current read only cache, we don't use its persistent characteri= stics currently.=C2=A0=20 > =C2=A0 > =C2=A0 > =C2=A0 -- This message was sent by Atlassian Jira (v8.3.2#803003) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscribe@hadoop.apache.org For additional commands, e-mail: hdfs-issues-help@hadoop.apache.org