[HBASE-15325] ResultScanner allowing partial result will miss the rest of the row if the region is moved between two rpc requests

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.2.0, 1.1.3
• Fix Version/s: 1.3.0, 1.2.1, 1.1.5, 2.0.0
• Component/s: dataloss, Scanners
• Labels: needs_releasenote
• Hadoop Flags: Reviewed
• Assignee: Phil Yang
• Reporter: Phil Yang
• Created: 25/Feb/16 06:18
• Updated: 09/Nov/17 00:20
• Resolved: 22/Mar/16 12:59

Description

HBASE-11544 allow scan rpc return partial of a row to reduce memory usage for one rpc request. And client can setAllowPartial or setBatch to get several cells in a row instead of the whole row.

However, the status of the scanner is saved on server and we need this to get the next part if there is a partial result before. If we move the region to another RS, client will get a NotServingRegionException and open a new scanner to the new RS which will be regarded as a new scan from the end of this row. So the rest cells of the row of last result will be missing.

Issue Links

• is blocked by: HBASE-15302 Reenable the other tests disabled by HBASE-14678
• is related to: HBASE-15484 Correct the semantic of batch and partial
• is related to: HBASE-15485 Filter.reset() should not be called between batches
• relates to: HBASE-11544 [Ergonomics] hbase.client.scanner.caching is dogged and will try to return batch even if it means OOME
• links to: Review board