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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11280) Document distributed log replay and distributed log splitting
Date Wed, 04 Jun 2014 15:13:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14017752#comment-14017752

stack commented on HBASE-11280:

This is great (I like this kind of stuff '<firstterm>Write Ahead Log (WAL)</firstterm>

Location looks correct to me.

Change this "The WAL implementation used by HBase is " because the HLog you point to is only
an Interface.  Implementations implement this Interface.  Currently there is one only but
attempts have been made at doing others and we may be doing a new one soon to do multiwal.

Change this "One HLog instance exists" ... to be instead "Usually there is one instance of
a WAL only per RegionServer..." (there is one HLog implementatoin true but I think you are
trying to say one WAL here).  We intend there to be many in the hopefully not too distant

WALs used to be kept under  <filename>/hbase/.logs/</filename> in and before 0.94.
 Now they are in  <filename>/hbase/WALs</filename>

The description of '+            <title>WAL Splitting, Step by Step</title>' applies
to Distributed Log Splitting.  You might want to call it out as so?

Maybe mention that the HMaster enrolls all regionservers in the log splitting process farming
log splitting process to the regionservers.

That is what I have so far (about half way through review)

> Document distributed log replay and distributed log splitting
> -------------------------------------------------------------
>                 Key: HBASE-11280
>                 URL: https://issues.apache.org/jira/browse/HBASE-11280
>             Project: HBase
>          Issue Type: Sub-task
>          Components: documentation, MTTR, wal
>            Reporter: Misty Stanley-Jones
>            Assignee: Misty Stanley-Jones
>             Fix For: 0.99.0
>         Attachments: HBASE-11280.patch
> Enable 'distributed log replay' by default.  Depends on hfilev3 being enabled.

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