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From "Shalin Shekhar Mangar (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1192) LRU-style map for the block cache
Date Sat, 02 May 2009 08:49:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12705242#action_12705242

Shalin Shekhar Mangar commented on HBASE-1192:

Thanks Jonathan.

bq. On the inside, it is very similar to a LinkedHashMap, just customized to be memory-aware
making use of our HeapSize interface. It turned out to be much easier and more efficient to
work with the data structures directly.

Sure, if you find it easier that way, that's fine.

{quote}It is possible we will run in to contention issues. If we saw issues, my plan was to
add buckets a la ConcurrentHashMap.

Looking at the solr implementation, that looks like what you guys did! Very cool.{quote}

This is what Solr has in trunk right now:

Also see SOLR-1082 where an ehcache based implementation was also discussed.

> 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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