Ujjawal Kumar created HBASE-29662:
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Summary: Reading data via TableSnapshotInputFormat should fail
instead of reading no data if restore directory got deleted
Key: HBASE-29662
URL: https://issues.apache.org/jira/browse/HBASE-29662
Project: HBase
Issue Type: Bug
Components: snapshots
Reporter: Ujjawal Kumar
We observed an issue in our production where data read via
TableSnapshotInputFormat was empty even though the snapshot had actual data.
The sequence of events look like this :
1. Snapshot was restored into a temp directory via
RestoreSnapshotHelper.copySnapshotForScanner (via
TableMapReduceUtil.initTableSnapshotMapperJob) as part of job submission
2. The temp directory was deleted by another process
3. Within mapper, HRegion were created on top of temp directory.
HRegionFileSystem#checkRegionInfoOnFilesystem was called to check regioninfo,
*it didn't find region level directory and recreated an empty one !*
Due to this, the MR job didn't read any data but was considered successful.
*The correct behavior would be to ensure that mapper fails if temp directory
doesn't exist*
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