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From ale...@apache.org
Subject [1/4] kudu git commit: [docs] note on unavailable tservers during rebalancing
Date Wed, 21 Nov 2018 03:29:39 GMT
Repository: kudu
Updated Branches:
  refs/heads/master 1eb82924a -> 66b06de7b

[docs] note on unavailable tservers during rebalancing

Change-Id: Ifa7a7590a90cee2e2d1399655621ec3618e51b25
Reviewed-on: http://gerrit.cloudera.org:8080/11966
Reviewed-by: Will Berkeley <wdberkeley@gmail.com>
Tested-by: Alexey Serbin <aserbin@cloudera.com>

Project: http://git-wip-us.apache.org/repos/asf/kudu/repo
Commit: http://git-wip-us.apache.org/repos/asf/kudu/commit/27baa0c9
Tree: http://git-wip-us.apache.org/repos/asf/kudu/tree/27baa0c9
Diff: http://git-wip-us.apache.org/repos/asf/kudu/diff/27baa0c9

Branch: refs/heads/master
Commit: 27baa0c99a4f4f075e2a9cc70323a358081e09e5
Parents: 1eb8292
Author: Alexey Serbin <alexey@apache.org>
Authored: Tue Nov 20 14:01:35 2018 -0800
Committer: Alexey Serbin <aserbin@cloudera.com>
Committed: Tue Nov 20 23:59:44 2018 +0000

 docs/administration.adoc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/docs/administration.adoc b/docs/administration.adoc
index ea27478..40690b2 100644
--- a/docs/administration.adoc
+++ b/docs/administration.adoc
@@ -1235,6 +1235,14 @@ the flag `--max_moves_per_server`. See `kudu cluster rebalance --help`
for more.
 It's safe to stop the rebalancer tool at any time. When restarted, the
 rebalancer will continue rebalancing the cluster.
+The rebalancer requires all registered tablet servers to be up and running
+to proceed with the rebalancing process. That's to avoid possible conflicts
+and races with the automatic re-replication and keep replica placement optimal
+for current configuration of the cluster. If a tablet server becomes
+unavailable during the rebalancing session, the rebalancer will exit. As noted
+above, it's safe to restart the rebalancer after resolving the issue with
+unavailable tablet servers.
 The rebalancing tool can rebalance Kudu clusters running older versions as well,
 with some restrictions. Consult the following table for more information. In the
 table, "RF" stands for "replication factor".

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