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https://issues.apache.org/jira/browse/HBASE-21062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16581637#comment-16581637
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Josh Elser commented on HBASE-21062:
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{quote}I had this working locally and must have botched this before making the
patch.
{quote}
Oh, I see. When I had that method working earlier, it was only doing this check
when AsyncFSWALProvider when it was the defaultProvider. I think I accidentally
undid that work – if AsyncFSWAL is specified and we can't load it, we should
fail.
> WALFactory has misleading notion of "default"
> ---------------------------------------------
>
> Key: HBASE-21062
> URL: https://issues.apache.org/jira/browse/HBASE-21062
> Project: HBase
> Issue Type: Bug
> Components: wal
> Reporter: Josh Elser
> Assignee: Josh Elser
> Priority: Major
> Fix For: 3.0.0, 2.0.2, 2.2.0, 2.1.1
>
> Attachments: HBASE-21062.001.branch-2.0.patch
>
>
> In WALFactory, there is an enum {{Providers}} which has a list of supported
> WALProvider implementations. In addition to list this, there is also a
> {{defaultProvider}} (which the Configuration defaults to), that is meant to
> be our "advertised" default WALProvider.
> However, the implementation of {{getProviderClass}} in WALFactory doesn't
> actually adhere to the value of this enum, instead *always* returning
> AsyncFSWal if it can be loaded.
> Having the default value in the enum but then overriding it in the
> implementation of {{getProviderClass}} is silly and misleading.
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