[HBASE-23056] Block count is 0 when BucketCache using persistent IOEngine and retrieve from file

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.5.0, 1.4.10, 2.2.1
• Fix Version/s: 3.0.0-alpha-1, 2.3.0, 1.6.0, 1.4.11
• Component/s: BucketCache
• Hadoop Flags: Reviewed
• Assignee: Baiqiang Zhao
• Reporter: Baiqiang Zhao
• Created: 20/Sep/19 07:58
• Updated: 11/Aug/20 18:12
• Resolved: 12/Oct/19 06:55

Description

We use FileIOEngine to store and read block data in BucketCache. Before stop RS, the BucketCache metrics in WebUI is like before_RS_restart.png, the block count is 3. When stop RS, the backing map is persistent to file. And then start RS, the metrics is like after_RS_restart.png, the block count is 0, but the size of blocks is correct.