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

[ramkrishna.s.vasudevan (JIRA)]

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https://issues.apache.org/jira/browse/HBASE-22480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16849089#comment-16849089
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ramkrishna.s.vasudevan commented on HBASE-22480:
------------------------------------------------

So here it means that the 
{code}
 HFileBlock seekToBlock = reader.getDataBlockIndexReader().seekToDataBlock(key, 
curBlock,
          cacheBlocks, pread, isCompaction, 
reader.getEffectiveEncodingInCache(isCompaction));
      if (seekToBlock == null) {
        return false;
      }
{code}
the seekToDataBlock() returns the same curBlock and so you want the curBlock 
from being returned? But just after this anyway the curBlock is updated with a 
new block right? 

> Get block from BlockCache once and return this block to BlockCache twice make 
> ref count error.
> ----------------------------------------------------------------------------------------------
>
>                 Key: HBASE-22480
>                 URL: https://issues.apache.org/jira/browse/HBASE-22480
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: binlijin
>            Assignee: binlijin
>            Priority: Major
>         Attachments: HBASE-22480-master-v1.patch, HBASE-22480-master-v2.patch
>
>
> 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.



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