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From granthe...@apache.org
Subject [2/2] kudu git commit: [docs] Add suggestion to mirror WAL and metadata directories
Date Wed, 02 May 2018 21:12:33 GMT
[docs] Add suggestion to mirror WAL and metadata directories

This adds a small suggestion to the configuration docs that
mirroring the WAL and metadata drives makes recovering from
failures easier, since the whole node won't have to be wiped.

Change-Id: Ie8ca6147f58da2fb3bedbc2679918c994c1ee5e3
Reviewed-on: http://gerrit.cloudera.org:8080/10268
Tested-by: Kudu Jenkins
Reviewed-by: Andrew Wong <awong@cloudera.com>


Project: http://git-wip-us.apache.org/repos/asf/kudu/repo
Commit: http://git-wip-us.apache.org/repos/asf/kudu/commit/e45fbd1b
Tree: http://git-wip-us.apache.org/repos/asf/kudu/tree/e45fbd1b
Diff: http://git-wip-us.apache.org/repos/asf/kudu/diff/e45fbd1b

Branch: refs/heads/master
Commit: e45fbd1b038a27df7dde866e8b992c030d2471b6
Parents: 7201b06
Author: Will Berkeley <wdberkeley@apache.org>
Authored: Tue May 1 11:57:23 2018 -0700
Committer: Will Berkeley <wdberkeley@gmail.com>
Committed: Wed May 2 18:50:19 2018 +0000

----------------------------------------------------------------------
 docs/configuration.adoc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/kudu/blob/e45fbd1b/docs/configuration.adoc
----------------------------------------------------------------------
diff --git a/docs/configuration.adoc b/docs/configuration.adoc
index 7e63588..390fc22 100644
--- a/docs/configuration.adoc
+++ b/docs/configuration.adoc
@@ -65,7 +65,11 @@ logs. The `--fs_metadata_dir` configuration indicates where Kudu will place
 metadata for each tablet. It is recommended, although not necessary, that these
 directories be placed on a high-performance drives with high bandwidth and low
 latency, e.g. solid-state drives. If `--fs_metadata_dir` is not specified,
-metadata will be placed in the directory specified by `--fs_wal_dir`.
+metadata will be placed in the directory specified by `--fs_wal_dir`. Since
+a Kudu node cannot tolerate the loss of its WAL or metadata directories, it
+may be wise to mirror the drives containing these directories in order to
+make recovering from a drive failure easier; however, mirroring may increase
+the latency of Kudu writes.
 
 The `--fs_data_dirs` configuration indicates where Kudu will write its data
 blocks. This is a comma-separated list of directories; if multiple values are


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