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From Apache Wiki <>
Subject [Cassandra Wiki] Update of "StorageConfiguration_0.7" by zznate
Date Thu, 13 May 2010 20:36:20 GMT
Dear Wiki user,

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The "StorageConfiguration_0.7" page has been changed by zznate.


  thrift_framed_transport: false
  == Memory, Disk, and Performance ==
+ Access mode. mmapped i/o is substantially faster, but only practical on a 64bit machine
(which notably does not include EC2 "small" instances) or relatively small datasets. "auto",
the safe choice, will enable mmapping on a 64bit JVM. Other values are "mmap", "mmap_index_only"
(which may allow you to get part of the benefits of mmap on a 32bit machine by mmapping only
index files) and "standard". (The buffer size settings that follow only apply to standard,
non-mmapped i/o.)
+ {{{
+ disk_access_mode: auto
+ }}}
  Buffer size to use when performing contiguous column slices. Increase this to the size of
the column slices you typically perform.  (Name-based queries are performed with a buffer
size of  !ColumnIndexSizeInKB.)

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