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From "Pavel Yaskevich (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-2731) Impelement in-house file caching.
Date Wed, 01 Jun 2011 21:44:48 GMT
Impelement in-house file caching.

                 Key: CASSANDRA-2731
             Project: Cassandra
          Issue Type: New Feature
          Components: Core
    Affects Versions: 1.0
            Reporter: Pavel Yaskevich
            Assignee: Pavel Yaskevich

Implement FileCache, CachedRandomAccessFile (to replace BufferedRandomAccessFile) and RadixTree
(to play role of the backend cache storage) classes.

FileCache class with be responsible for storing/retrieving data from Radix Tree and also flushing
of the dirty pages to the disk, page management such as adding new pages, utilizing old/unused

CRAF Linux only features (via JNI):

1). O_DIRECT for both read/write operations.
2). AIO's lio_listio write operation batching.

Provide possibility to migrate hot data directly from Memtable to CRAF cache to keep live-reads
data always hot in memory. To minimise compaction effects CRAF should provide a way to by-pass
a caching data if it does not already exists. 

Provide a way to make pointers in the cache which will be useful to minimize impact on performance
when a single column is distributed among multiple SSTable files (except counter columns).

Use jemalloc ( for cache memory management.

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