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From "Yu Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15265) Implement an asynchronous FSHLog
Date Mon, 14 Mar 2016 03:23:33 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15192699#comment-15192699
] 

Yu Li commented on HBASE-15265:
-------------------------------

[~Apache9]
Good progress and great work sir!

bq. I think multiwal should not act as a 'WALProvider' in config, instead, it should be an
option.
FWIW, instead of supplying a new provider, it's more natural as a new WAL implementation?
Currently although we have abstract WAL as an interface, there's no configuration to choose
the WAL type. Let {{WALProvider}} specify how we provide WALs (server-based DefaultWALProvider
or region-based RegionGroupingProvider) and {{WAL}} specify which type of WAL we're using
(sync or async), maybe this is more clear?

bq. Not that hard, but as discussed in HBASE-14949, it is not safe to integration this feature
into branch-1? User should first upgrade to a version that contains HBASE-14949, then they
can do rolling upgrade to enable AsyncFSWAL.
At a glance of HBASE-14949 and comments there, it seems multiwal will have some problem with
the patch? But checking UT result only TestReplicationEndpointWithMultipleWAL failed with
jdk8 and all others passed, mind help clarify what problem there might be? And could rolling-upgrade
work while "first upgrade to a version contains HBASE-14949" and to use async FSHLog we only
need a two-steps rolling-upgrade?
Since 1.x is our current stable release branch and I believe this work will benefit a lot
for write latency, I'd like to give async wal an early try  when it completes. Not sure but
there might be more work if we make it compatible with multiple WAL (asking because we already
using multiwal online)? Let me know if anything I could help to complete the work for multiwal.
Thanks.

> Implement an asynchronous FSHLog
> --------------------------------
>
>                 Key: HBASE-15265
>                 URL: https://issues.apache.org/jira/browse/HBASE-15265
>             Project: HBase
>          Issue Type: Sub-task
>          Components: wal
>            Reporter: Duo Zhang
>            Assignee: Duo Zhang
>             Fix For: 2.0.0
>
>         Attachments: HBASE-15265-v1.patch, HBASE-15265-v2.patch, HBASE-15265-v3.patch,
HBASE-15265-v4.patch, HBASE-15265-v5.patch, HBASE-15265-v6.patch, HBASE-15265-v7.patch, HBASE-15265.patch
>
>




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