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Merge PR #42444 into master

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* refs/pull/42444/head:
	doc/cephfs/journaler: document options using confval directive

Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>
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Patrick Donnelly 2021-07-22 07:54:52 -07:00
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Journaler
===========
``journaler write head interval``
:Description: How frequently to update the journal head object
:Type: Integer
:Required: No
:Default: ``15``
``journaler prefetch periods``
:Description: How many stripe periods to read-ahead on journal replay
:Type: Integer
:Required: No
:Default: ``10``
``journal prezero periods``
:Description: How many stripe periods to zero ahead of write position
:Type: Integer
:Required: No
:Default: ``10``
``journaler batch interval``
:Description: Maximum additional latency in seconds we incur artificially.
:Type: Double
:Required: No
:Default: ``.001``
``journaler batch max``
:Description: Maximum bytes we will delay flushing.
:Type: 64-bit Unsigned Integer
:Required: No
:Default: ``0``
.. confval:: journaler_write_head_interval
.. confval:: journaler_prefetch_periods
.. confval:: journaler_prezero_periods