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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-1460) Concurrent LRU Block Cache
Date Mon, 01 Jun 2009 06:42:08 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1460?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Gray updated HBASE-1460:
---------------------------------

    Attachment: HBASE-1460-v2.patch

Unit tested and so far it works as advertised.  A couple more unit tests still needed to get
full coverage.

> 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
>
>
> 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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