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https://issues.apache.org/jira/browse/HBASE-1192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12705114#action_12705114
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Shalin Shekhar Mangar commented on HBASE-1192:
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Can someone elaborate on why a custom implementation of an LRUCache is being
made? I guess you can achieve memory-awareness by extending or wrapping a
LinkedHashMap.
Also, is the synchronized get/put alright for this use-case? Solr had some
issues with synchronized LRUCache when the cache was hit thousands of times per
second. SOLR-667 has a good implementation that you can look at.
I do not have the complete background so I may have missed something.
> LRU-style map for the block cache
> ---------------------------------
>
> Key: HBASE-1192
> URL: https://issues.apache.org/jira/browse/HBASE-1192
> Project: Hadoop HBase
> Issue Type: New Feature
> Components: regionserver
> Reporter: Jonathan Gray
> Assignee: ryan rawson
> Priority: Blocker
> Fix For: 0.20.0
>
> Attachments: hbase-1192-v1.patch, hbase-1192-v2.patch,
> hbase-1192-v3.patch
>
>
> We need to decide what structure to use to back the block cache. The primary
> decision is whether to continue using SoftReferences or to build our own
> structure.
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