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https://issues.apache.org/jira/browse/HBASE-1460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714945#action_12714945
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stack commented on HBASE-1460:
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I think the bulk of the '30/May/09 05:43 PM' comment should go into class
comment or into the hfile package-info javadoc. Its good stuff on
implementation. Belongs in code rather than buried here in JIRA.
I wonder if the eviction thread will be able to keep up? We can test and see.
> Concurrent LRU Block Cache
> --------------------------
>
> Key: HBASE-1460
> URL: https://issues.apache.org/jira/browse/HBASE-1460
> Project: Hadoop HBase
> Issue Type: Improvement
> Components: io
> Reporter: Jonathan Gray
> Assignee: Jonathan Gray
> Fix For: 0.20.0
>
> Attachments: HBASE-1460-v1.patch
>
>
> The LRU-based block cache that will be committed in HBASE-1192 is thread-safe
> but contains a big lock on the hash map. Under high load, the block cache
> will be hit very heavily from a number of threads, so it needs to be built to
> handle massive concurrency.
> This issue aims to implement a new block cache with LRU eviction, but backed
> by a ConcurrentHashMap and a separate eviction thread. Influence will be
> drawn from Solr's ConcurrentLRUCache, however there are major differences
> because solr treats all cached elements as equal size whereas we are
> dependent on our HeapSize interface with realistic (though approximate) heap
> usage.
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