[HBASE-20017] BufferedMutatorImpl submit the same mutation repeatedly

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 1.4.0, 1.4.1, 1.4.2
• Fix Version/s: 1.4.2, 2.0.0
• Component/s: Client
• Hadoop Flags: Reviewed
• Release Note: This change fixes multithreading issues in the implementation of BufferedMutator. BufferedMutator should not be used with 1.4 releases prior to 1.4.2.
• Assignee: Chia-Ping Tsai
• Reporter: Chia-Ping Tsai
• Created: 18/Feb/18 09:39
• Updated: 01/Feb/19 20:02
• Resolved: 21/Feb/18 01:02

Description

BMI pass a iter of inner buffer to AsyncProcess to take the undealt mutations, AsyncProcess call iter#next to get the mutation and then call iter#remove to delete the mutation from inner buffer. Hence, There's a good chance that  the mutation is processed repeatedly in case there are a bunch of threads which are running the flush.

Issue Links

• is caused by: HBASE-16224 Reduce the number of RPCs for the large PUTs