[HBASE-17608] Add suspend support for RawScanResultConsumer

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.0.0
• Component/s: asyncclient, Client, Scanners
• Hadoop Flags: Reviewed
• Assignee: Duo Zhang
• Reporter: Duo Zhang
• Created: 07/Feb/17 08:45
• Updated: 07/May/19 16:11
• Resolved: 22/Feb/17 12:43

Description

Now for the AsyncResultScanner, we can only close the scanner if we reach the cache size limit and open a new scanner later. This will breaks the region level consistency.

For example, you put 10 rows to the region, and open a scanner to scan it. The scanner returns 5 rows at the first time and the cache is full, so it closes the background scanner. And before you reopens the scanner to fetch data, the remaining 5 rows has been deleted and a compaction makes them gone for ever. Then after you reopen the scanner you can not see the remaining 5 rows.

So here we should keep the scanner open at RS side to prevent the data below the mvcc read point of this scanner being deleted.

Issue Links

• links to: reviewboard