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https://issues.apache.org/jira/browse/HBASE-23056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16949929#comment-16949929
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Reid Chan commented on HBASE-23056:
-----------------------------------

Applied to branch-1, branch-1.4, branch-2, master.

> Block count is 0 when BucketCache using persistent IOEngine and retrieve from 
> file 
> -----------------------------------------------------------------------------------
>
>                 Key: HBASE-23056
>                 URL: https://issues.apache.org/jira/browse/HBASE-23056
>             Project: HBase
>          Issue Type: Bug
>          Components: BucketCache
>    Affects Versions: 1.5.0, 1.4.10, 2.2.1, master
>            Reporter: Baiqiang Zhao
>            Assignee: Baiqiang Zhao
>            Priority: Minor
>         Attachments: HBASE-23056-branch-1.0001.patch, 
> HBASE-23056.master.0001.patch, after_RS_restart.png, before_RS_restart.png
>
>
> 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. 



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