[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.