[HBASE-15811] Batch Get after batch Put does not fetch all Cells

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 1.0.0, 1.3.0, 1.2.1, 0.98.19
• Fix Version/s: 1.3.0, 1.2.2, 1.1.6, 2.0.0
• Component/s: Client

Release Note

We were not waiting on all executors in a batch to complete which meant a read-your-own-writes could sometimes fail -- especially if client is loaded; i.e. putting to multiple machines in a cluster. The test for no-more-executors was damaged by the 0.99/0.98.4 fix "HBASE-11403 Fix race conditions around Object#notify"

• Assignee: Michael Stack
• Reporter: Michael Stack
• Created: 10/May/16 18:36
• Updated: 06/Apr/18 04:33
• Resolved: 14/May/16 01:06

Description

A big batch put followed by a batch get does not always return all Cells put. See attached test program by Robert Farr that reproduces the issue. It seems to be an issue to do with a cluster of more than one machine. Running against a single machine does not have the problem (though the single machine may have many regions). Robert was unable to make his program fail with a single machine only.

I reproduced what Robert was seeing running his program. I was also unable to make a single machine fail. In a batch of 1000 puts, I see one to three Gets fail. I noticed too that if I wait a second after a fail and then re-get, the Get succeeds.

Issue Links

• is duplicated by: HBASE-15922 Fix waitForMaximumCurrentTasks logic in AsyncProcess