[HBASE-23239] Reporting on status of backing MOB files from client-facing cells - ASF JIRA

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Release Note:

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Users of the MOB feature can now use the `mobrefs` utility to get statistics about data in the MOB system and verify the health of backing files on HDFS.

```
HADOOP_CLASSPATH=/etc/hbase/conf:$(hbase mapredcp) yarn jar \
/some/path/to/hbase-shaded-mapreduce.jar mobrefs mobrefs-report-output some_table foo
```

See javadocs of the class `MobRefReporter` for more details.

the reference guide has added some information about MOB internals and troubleshooting.

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 Users of the MOB feature can now use the `mobrefs` utility to get statistics about data in the MOB system and verify the health of backing files on HDFS. ``` HADOOP_CLASSPATH=/etc/hbase/conf:$(hbase mapredcp) yarn jar \ /some/path/to/hbase-shaded-mapreduce.jar mobrefs mobrefs-report-output some_table foo ``` See javadocs of the class `MobRefReporter` for more details. the reference guide has added some information about MOB internals and troubleshooting.

We should be able to do some correctness testing of the mob files referenced by current cells in a mob enabled table.

is related to

HBASE-22075 Potential data loss when MOB compaction fails

HBASE-23222 Better logging and mitigation for MOB compaction failures

links to

GitHub Pull Request #785