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https://issues.apache.org/jira/browse/HBASE-21246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16675458#comment-16675458
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Ted Yu commented on HBASE-21246:
--------------------------------
replication-src-creates-wal-reader.jpg shows how WAL Reader is created for
replication source:
ReplicationSource calls walProvider#getWalStream which returns WALEntryStream.
AbstractWALEntryStream#createReader calls WALProvider#createReader
wal-splitter-reader.jpg shows how WAL Reader is created for log splitting:
WALSplitter#getReader calls WALProvider#createReader.
Below WALProvider, AbstractFSWALProvider and DisabledWALProvider are shown
which implement WALProvider interface.
AsyncFSWALProvider and FSHLogProvider extend AbstractFSWALProvider
wal-splitter-writer.jpg shows how WAL Writer is created for log splitting.
> 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, 21246.20.txt, 21246.21.txt,
> 21246.23.txt, 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,
> replication-src-creates-wal-reader.jpg, wal-factory-providers.png,
> wal-providers.png, wal-splitter-reader.jpg, wal-splitter-writer.jpg
>
>
> 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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