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From a...@apache.org
Subject kudu git commit: release notes: document disk-group-sizing flag
Date Mon, 28 Aug 2017 22:52:27 GMT
Repository: kudu
Updated Branches:
  refs/heads/master 82a8e9f99 -> 334dcbe2b


release notes: document disk-group-sizing flag

Change-Id: I0664c132711ea55a6eedea9bc795ab52d8ecc2f6
Reviewed-on: http://gerrit.cloudera.org:8080/7860
Tested-by: Kudu Jenkins
Reviewed-by: Adar Dembo <adar@cloudera.com>


Project: http://git-wip-us.apache.org/repos/asf/kudu/repo
Commit: http://git-wip-us.apache.org/repos/asf/kudu/commit/334dcbe2
Tree: http://git-wip-us.apache.org/repos/asf/kudu/tree/334dcbe2
Diff: http://git-wip-us.apache.org/repos/asf/kudu/diff/334dcbe2

Branch: refs/heads/master
Commit: 334dcbe2bbcf8a0a1fb25fdbd4740fc252763e62
Parents: 82a8e9f
Author: Andrew Wong <awong@cloudera.com>
Authored: Mon Aug 28 14:19:32 2017 -0700
Committer: Adar Dembo <adar@cloudera.com>
Committed: Mon Aug 28 22:52:03 2017 +0000

----------------------------------------------------------------------
 docs/release_notes.adoc | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/kudu/blob/334dcbe2/docs/release_notes.adoc
----------------------------------------------------------------------
diff --git a/docs/release_notes.adoc b/docs/release_notes.adoc
index dac371a..527989f 100644
--- a/docs/release_notes.adoc
+++ b/docs/release_notes.adoc
@@ -67,9 +67,13 @@
   startup. This feature is experimental; by default, Kudu will crash if it
   experiences a disk failure. When enabled, tablets with any data on the failed
   disk will not be opened and will be replicated as needed. To enable this, set
-  the `--suicide_on_eio` flag to `false`. Note that the first configured data
-  directory and the WAL directory cannot currently tolerate disk failures, and
-  disk failures during run-time are still fatal.
+  the `--suicide_on_eio` flag to `false`. There is additionally a configurable
+  tradeoff beteween a newly added tablet's tolerance to disk failures and its
+  parallelization of I/O via the `--fs_target_data_dirs_per_tablet` flag.
+  Tablets that are spread across fewer disks are less likely to be affected by
+  a disk failure, at the cost of reduced parallelism. Note that the first
+  configured data directory and the WAL directory cannot currently tolerate
+  disk failures, and disk failures during run-time are still fatal.
 
 * Kudu server web UIs have a new configuration dashboard (/config) which gives a
   a high level view of important security configuration values. The dashboard


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