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https://issues.apache.org/jira/browse/HBASE-1460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12724976#action_12724976
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Lars George commented on HBASE-1460:
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Hmmm, no offense guys... but
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> 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, HBASE-1460-v2.patch,
> HBASE-1460-v3.patch, HBASE-1460-v4.patch, HBASE-1460-v5.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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