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

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.0, 2.0.0, 2.2.0
• Fix Version/s: 3.0.0-alpha-1, 2.3.0, 2.2.3, 2.1.9
• Component/s: mapreduce, mob, Operability

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.

• Assignee: Sean Busbey
• Reporter: Sean Busbey
• Created: 31/Oct/19 17:09
• Updated: 17/Dec/19 23:59
• Resolved: 16/Dec/19 20:40

Description

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

Issue Links

• is related to: HBASE-22075 Potential data loss when MOB compaction fails
• is related to: HBASE-23222 Better logging and mitigation for MOB compaction failures
• links to: GitHub Pull Request #785