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https://issues.apache.org/jira/browse/HBASE-21246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16659691#comment-16659691
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Ted Yu commented on HBASE-21246:
--------------------------------
I have updated the link to point to the actual thread on the design doc.
bq. Is there a 'design' for WI?
Quoting my response from the discussion (for people who didn't have time to
read the full thread):
{code}
>From my experiments over HBASE-21246, I think it is preferable to have
>WALIdentity (please see the patch attached on HBASE-21246).
In hbase, we have the following related pairs:
HTable <-> TableName
HRegion <-> HRegionInfo
The pair of WAL instance and WALIdentity is similar.
* WALIdentity is light weight - the classes referencing WAL by WALIdentity
wouldn't hold onto much resource
* WALProvider handles deserialization from String form of WAL name to
WALIdentity
{code}
bq. Where is the 'outline'?
There is code snippet for the paragraph where the discussion thread was
centered around.
Please also see subsequent paragraph below the code snippet.
> Introduce WALIdentity interface
> -------------------------------
>
> Key: HBASE-21246
> URL: https://issues.apache.org/jira/browse/HBASE-21246
> Project: HBase
> Issue Type: Sub-task
> Reporter: Ted Yu
> Assignee: Ted Yu
> Priority: Major
> Fix For: HBASE-20952
>
> Attachments: 21246.003.patch, 21246.HBASE-20952.001.patch,
> 21246.HBASE-20952.002.patch, 21246.HBASE-20952.004.patch,
> 21246.HBASE-20952.005.patch, 21246.HBASE-20952.007.patch,
> 21246.HBASE-20952.008.patch
>
>
> We are introducing WALIdentity interface so that the WAL representation can
> be decoupled from distributed filesystem.
> The interface provides getName method whose return value can represent
> filename in distributed filesystem environment or, the name of the stream
> when the WAL is backed by log stream.
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