HBASE-20329 Add note for operators to refguide on AsyncFSWAL; ADDENDUM

Add small note on edits being immediately visible when Durability == ASYNC_WAL.


Project: http://git-wip-us.apache.org/repos/asf/hbase/repo
Commit: http://git-wip-us.apache.org/repos/asf/hbase/commit/d59a6c81
Tree: http://git-wip-us.apache.org/repos/asf/hbase/tree/d59a6c81
Diff: http://git-wip-us.apache.org/repos/asf/hbase/diff/d59a6c81

Branch: refs/heads/HBASE-20388
Commit: d59a6c8166cf398ee62089cc35ffeddfe5824134
Parents: 17a29ac
Author: Michael Stack <st...@apache.org>
Authored: Thu Apr 12 15:59:00 2018 -0700
Committer: Michael Stack <st...@apache.org>
Committed: Thu Apr 12 16:00:11 2018 -0700

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 src/main/asciidoc/_chapters/architecture.adoc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/hbase/blob/d59a6c81/src/main/asciidoc/_chapters/architecture.adoc
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diff --git a/src/main/asciidoc/_chapters/architecture.adoc 
b/src/main/asciidoc/_chapters/architecture.adoc
index bc29d4b..1d6fc60 100644
--- a/src/main/asciidoc/_chapters/architecture.adoc
+++ b/src/main/asciidoc/_chapters/architecture.adoc
@@ -1248,7 +1248,7 @@ dictionary because of an abrupt termination, a read of 
this last block may not b
 It is possible to set _durability_ on each Mutation or on a Table basis. 
Options include:
 
  * _SKIP_WAL_: Do not write Mutations to the WAL (See the next section, 
<<wal.disable>>).
- * _ASYNC_WAL_: Write the WAL asynchronously; do not hold-up clients waiting 
on the sync of their write to the filesystem but return immediately; the 
Mutation will be flushed to the WAL at a later time. This option currently may 
lose data. See HBASE-16689.
+ * _ASYNC_WAL_: Write the WAL asynchronously; do not hold-up clients waiting 
on the sync of their write to the filesystem but return immediately. The edit 
becomes visible. Meanwhile, in the background, the Mutation will be flushed to 
the WAL at some time later. This option currently may lose data. See 
HBASE-16689.
  * _SYNC_WAL_: The *default*. Each edit is sync'd to HDFS before we return 
success to the client.
  * _FSYNC_WAL_: Each edit is fsync'd to HDFS and the filesystem before we 
return success to the client.
 

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