Return-Path: X-Original-To: archive-asf-public-internal@cust-asf2.ponee.io Delivered-To: archive-asf-public-internal@cust-asf2.ponee.io Received: from cust-asf.ponee.io (cust-asf.ponee.io [163.172.22.183]) by cust-asf2.ponee.io (Postfix) with ESMTP id D9E54200CAD for ; Wed, 28 Jun 2017 20:44:07 +0200 (CEST) Received: by cust-asf.ponee.io (Postfix) id D8936160BF7; Wed, 28 Jun 2017 18:44:07 +0000 (UTC) Delivered-To: archive-asf-public@cust-asf.ponee.io Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by cust-asf.ponee.io (Postfix) with SMTP id 2B6F6160BD9 for ; Wed, 28 Jun 2017 20:44:07 +0200 (CEST) Received: (qmail 41217 invoked by uid 500); 28 Jun 2017 18:44:06 -0000 Mailing-List: contact commits-help@kudu.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@kudu.apache.org Delivered-To: mailing list commits@kudu.apache.org Received: (qmail 41208 invoked by uid 99); 28 Jun 2017 18:44:06 -0000 Received: from git1-us-west.apache.org (HELO git1-us-west.apache.org) (140.211.11.23) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 28 Jun 2017 18:44:06 +0000 Received: by git1-us-west.apache.org (ASF Mail Server at git1-us-west.apache.org, from userid 33) id 46BB1DFB94; Wed, 28 Jun 2017 18:44:06 +0000 (UTC) Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: mpercy@apache.org To: commits@kudu.apache.org Date: Wed, 28 Jun 2017 18:44:06 -0000 Message-Id: X-Mailer: ASF-Git Admin Mailer Subject: [1/5] kudu git commit: [docs] Add an upgrade note about MM threads archived-at: Wed, 28 Jun 2017 18:44:08 -0000 Repository: kudu Updated Branches: refs/heads/master 15e33c122 -> e9622028c [docs] Add an upgrade note about MM threads Some users configure MM threads to high values to work around the fact that the MM was slow at scheduling tasks. This is now fixed in 1.4, so this patch adds a note about this. Change-Id: I5b9c36e04d24d0bc9991f19da35b29b474dd6022 Reviewed-on: http://gerrit.cloudera.org:8080/7283 Reviewed-by: Adar Dembo Reviewed-by: Todd Lipcon Tested-by: Jean-Daniel Cryans Project: http://git-wip-us.apache.org/repos/asf/kudu/repo Commit: http://git-wip-us.apache.org/repos/asf/kudu/commit/42a07499 Tree: http://git-wip-us.apache.org/repos/asf/kudu/tree/42a07499 Diff: http://git-wip-us.apache.org/repos/asf/kudu/diff/42a07499 Branch: refs/heads/master Commit: 42a07499cd5b2b255a3734a26c9af7000f3cbd89 Parents: 15e33c1 Author: Jean-Daniel Cryans Authored: Fri Jun 23 15:19:07 2017 -0700 Committer: Jean-Daniel Cryans Committed: Wed Jun 28 17:38:07 2017 +0000 ---------------------------------------------------------------------- docs/release_notes.adoc | 9 +++++++++ 1 file changed, 9 insertions(+) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/kudu/blob/42a07499/docs/release_notes.adoc ---------------------------------------------------------------------- diff --git a/docs/release_notes.adoc b/docs/release_notes.adoc index f8dddfc..7e74db4 100644 --- a/docs/release_notes.adoc +++ b/docs/release_notes.adoc @@ -30,6 +30,15 @@ [[rn_1.4.0]] +[[rn_1.4.0_upgrade_notes]] +== Upgrade Notes + +* The Maintenance Manager now fully uses the threads it's given (see the improvements + described further below), so it's now able to generate a lot more IO by flushing and + compacting more often. Generally, the recommended ratio of MM threads to data + directories is 1:3; operators of clusters above that ratio should be mindful of + this when upgrading. + [[rn_1.4.0_new_features]] == New features