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From mpe...@apache.org
Subject [1/5] kudu git commit: [docs] Add an upgrade note about MM threads
Date Wed, 28 Jun 2017 18:44:06 GMT
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 <adar@cloudera.com>
Reviewed-by: Todd Lipcon <todd@apache.org>
Tested-by: Jean-Daniel Cryans <jdcryans@apache.org>


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 <jdcryans@apache.org>
Authored: Fri Jun 23 15:19:07 2017 -0700
Committer: Jean-Daniel Cryans <jdcryans@apache.org>
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
 


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