[HBASE-22480] Get block from BlockCache once and return this block to BlockCache twice make ref count error.

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2.2
• Fix Version/s: 3.0.0-alpha-1, 2.3.0, 2.2.3
• Assignee: Lijin Bin
• Reporter: Lijin Bin
• Created: 27/May/19 09:03
• Updated: 08/Mar/20 05:31
• Resolved: 08/Nov/19 01:41

Description

After debugging HBASE-22433, i find the problem it is that we get a block from BucketCache once and return this block to BucketCache twice and make the ref count error, sometimes the refCount can be negative.

Issue Links

• is related to: HBASE-22463 Some paths in HFileScannerImpl did not consider block#release which will exhaust the ByteBuffAllocator
• is related to: HBASE-23950 Backport HBASE-22480 to branch-2.1
• relates to: HBASE-23258 Reconsider the DBB memory leak in the exceptional paths.
• links to: reviw board