[HBASE-6390] append() and increment() may result in inconsistent result on retries.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 0.94.0, 0.95.2
• Assignee: Unassigned
• Reporter: Ashutosh Jindal
• Created: 13/Jul/12 04:30
• Updated: 13/Jun/22 17:03
• Resolved: 31/Jan/13 04:14

Description

append() and increment() api can give inconsistent result in following scenarios :

1- For eg, if the client does not receive the response in the specified time, it retries. Now the first call to increment/append is already done and this retry will again make the operation to succeed.
2- Now if the sync() to WAL fails we get an IOException, on getting an exception there is a retry done which again results in the doing the increment/append again.

When may need some sort of roll back for the second problem.

For the first one we need to see how to handle this.