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doc: Edited Key/Value store config reference.

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Signed-off-by: John Wilkins <john.wilkins@inktank.com>
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John Wilkins 2014-11-04 12:02:47 -08:00
parent 03be944cdc
commit 6da9405155
1 changed files with 19 additions and 18 deletions

37
doc/rados/configuration/keyvaluestore-config-ref.rst
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@ -1,16 +1,15 @@
============================
===============================
KeyValueStore Config Reference
============================
===============================
KeyValueStore is a another OSD backend compared to FileStore. Now it mainly
use LevelDB as backend.
``KeyValueStore`` is an alternative OSD backend compared to FileStore.
Currently, it uses LevelDB as backend. ``KeyValueStore`` doesn't need journal
device. Each operation will flush into the backend directly.
KeyValueStore doesn't need jounal device, each op will flush into backend
directly.
``keyvaluestore backend``
:Description: the backend used by keyvaluestore
:Description: The backend used by ``KeyValueStore``.
:Type: String
:Required: No
:Default: ``leveldb``
@ -21,11 +20,14 @@ directly.
Queue
=====
The following settings provide limits on the size of keyvaluestore queue.
The following settings provide limits on the size of the ``KeyValueStore``
queue.
``keyvaluestore queue max ops``
:Description: Defines the maximum number of in progress operations the keyvaluestore accepts before blocking on queuing new operations.
:Description: Defines the maximum number of operations in progress the
``KeyValueStore`` accepts before blocking on queuing new operations.
:Type: Integer
:Required: No. Minimal impact on performance.
:Default: ``50``
@ -46,7 +48,7 @@ Thread
``keyvaluestore op threads``
:Description: The number of keyvaluestore operation threads that execute in parallel.
:Description: The number of ``KeyValueStore`` operation threads that execute in parallel.
:Type: Integer
:Required: No
:Default: ``2``
@ -54,7 +56,7 @@ Thread
``keyvaluestore op thread timeout``
:Description: The timeout for a keyvaluestore operation thread (in seconds).
:Description: The timeout for a ``KeyValueStore`` operation thread (in seconds).
:Type: Integer
:Required: No
:Default: ``60``
@ -62,7 +64,7 @@ Thread
``keyvaluestore op thread suicide timeout``
:Description: The timeout for a commit operation before cancelling the commit (in seconds).
:Description: The timeout for a commit operation before canceling the commit (in seconds).
:Type: Integer
:Required: No
:Default: ``180``
@ -74,10 +76,9 @@ Misc
``keyvaluestore default strip size``
:Description: each object will be split into multi key/value pairs stored into
backend.
Note: now this option is important to performance for estimable
workload
:Description: Each object will be split into multiple key/value pairs and
stored in the backend. **Note:** The size of the workload has
a significant impact on performance.
:Type: Integer
:Required: No
:Default: ``4096``
@ -85,8 +86,8 @@ Misc
``keyvaluestore header cache size``
:Description: the number of header cache, it just like "inode" in local
filesystem. The larger cache size will be help for performance
:Description: The size of the header cache (identical to ``inode`` in the local
filesystem). A larger cache size enhances performance.
:Type: Integer
:Required: No