[
https://issues.apache.org/jira/browse/HBASE-20329?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
stack resolved HBASE-20329.
---------------------------
Resolution: Fixed
I just pushed a minor addendum:
{code}
commit d59a6c8166cf398ee62089cc35ffeddfe5824134 (HEAD -> m, origin/master,
origin/HEAD)
Author: Michael Stack <[email protected]>
Date: Thu Apr 12 15:59:00 2018 -0700
HBASE-20329 Add note for operators to refguide on AsyncFSWAL; ADDENDUM
Add small note on edits being immediately visible when Durability ==
ASYNC_WAL.
diff --git a/src/main/asciidoc/_chapters/architecture.adoc
b/src/main/asciidoc/_chapters/architecture.adoc
index bc29d4b1db..1d6fc60bad 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.
{code}
> Add note for operators to refguide on AsyncFSWAL
> ------------------------------------------------
>
> Key: HBASE-20329
> URL: https://issues.apache.org/jira/browse/HBASE-20329
> Project: HBase
> Issue Type: Sub-task
> Components: documentation, wal
> Reporter: stack
> Assignee: stack
> Priority: Critical
> Fix For: 3.0.0
>
> Attachments: HBASE-20329.master.001.patch
>
>
> Need a few notes in refguide on this new facility.
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