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https://issues.apache.org/jira/browse/HBASE-20952?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Josh Elser updated HBASE-20952:
-------------------------------
Description:
Take a step back from the current WAL implementations and think about what an
HBase WAL API should look like. What are the primitive calls that we require to
guarantee durability of writes with a high degree of performance?
The API needs to take the current implementations into consideration. We should
also have a mind for what is happening in the Ratis LogService (but the
LogService should not dictate what HBase's WAL API looks like RATIS-272).
Other "systems" inside of HBase that use WALs are replication and
backup&restore. Replication has the use-case for "tail"'ing the WAL which we
should provide via our new API. B&R doesn't do anything fancy (IIRC). We should
make sure all consumers are generally going to be OK with the API we create.
The API may be "OK" (or OK in a part). We need to also consider other methods
which were "bolted" on such as {{AbstractFSWAL}} and {{WALFileLengthProvider}}.
Other corners of "WAL use" (like the {{WALSplitter}} should also be looked at
to use WAL-APIs only).
We also need to make sure that adequate interface audience and stability
annotations are chosen.
was:
Take a step back from the current WAL implementations and think about what an
HBase WAL API should look like. What are the primitive calls that we require to
guarantee durability of writes with a high degree of performance?
The API needs to take the current implementations into consideration. We should
also have a mind for what is happening in the Ratis LogService (but the
LogService should not dictate what HBase's WAL API looks like RATIS-272).
The API may be "OK" (or OK in a part). We need to also consider other methods
which were "bolted" on such as {{AbstractFSWAL}} and {{WALFileLengthProvider}}.
Other corners of "WAL use" (like the {{WALSplitter}} should also be looked at
to use WAL-APIs only).
We also need to make sure that adequate interface audience and stability
annotations are chosen.
> Re-visit the WAL API
> --------------------
>
> Key: HBASE-20952
> URL: https://issues.apache.org/jira/browse/HBASE-20952
> Project: HBase
> Issue Type: Sub-task
> Components: wal
> Reporter: Josh Elser
> Priority: Major
>
> Take a step back from the current WAL implementations and think about what an
> HBase WAL API should look like. What are the primitive calls that we require
> to guarantee durability of writes with a high degree of performance?
> The API needs to take the current implementations into consideration. We
> should also have a mind for what is happening in the Ratis LogService (but
> the LogService should not dictate what HBase's WAL API looks like RATIS-272).
> Other "systems" inside of HBase that use WALs are replication and
> backup&restore. Replication has the use-case for "tail"'ing the WAL which we
> should provide via our new API. B&R doesn't do anything fancy (IIRC). We
> should make sure all consumers are generally going to be OK with the API we
> create.
> The API may be "OK" (or OK in a part). We need to also consider other methods
> which were "bolted" on such as {{AbstractFSWAL}} and
> {{WALFileLengthProvider}}. Other corners of "WAL use" (like the
> {{WALSplitter}} should also be looked at to use WAL-APIs only).
> We also need to make sure that adequate interface audience and stability
> annotations are chosen.
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