stack reopened HBASE-20329:

Reopening to add an addendum that answers this question from mailing list:

*ASYNC_WAL and visibility*
Hi all,
I cannot find any good information about ASYNC_WAL semantics.
As much as I understand the worst I can get - data loss in case of region
But the question I have - can it affect visibility in any way? Does it
still follow the principle "When a client receives a "success" response for
any mutation, that mutation is immediately visible to both that client and
any client with whom it later communicates through side channels" ?
Another question - is data loss possible in any situation other than region

[~anoop.hbase] answered it. The doc now has note on possible dataloss but need 
to add the bit on visibility.

> 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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