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https://issues.apache.org/jira/browse/HBASE-12295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14315670#comment-14315670
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ramkrishna.s.vasudevan commented on HBASE-12295:
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bq.Another way is maintaining reference counting by ourselves. But this is also
hard since we even want to use the BB that fetched from BucketCache in RpcServer
Thanks for the ping on this issue. Just seeing that. We are planning to go
with ref counting way. As you said to account for the places where all it
should be decreased and incremented is quite challenging. Currently the block
being referenced is just GC'ed once a new block is loaded. We have tried out a
code for this (like POC - may need some clean up ) and verify the correctness
for all cases. But it seems to work. We have tested for positive cases. But
not for much of the exception cases. We are in the process of reviewing it and
improving it.
> Prevent block eviction under us if reads are in progress from the BBs
> ---------------------------------------------------------------------
>
> Key: HBASE-12295
> URL: https://issues.apache.org/jira/browse/HBASE-12295
> Project: HBase
> Issue Type: Sub-task
> Components: regionserver, Scanners
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Fix For: 2.0.0
>
>
> While we try to serve the reads from the BBs directly from the block cache,
> we need to ensure that the blocks does not get evicted under us while
> reading. This JIRA is to discuss and implement a strategy for the same.
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