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doc: add readdir-ahead documentation

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Change-Id: Ib6fc3c9b59b498bfe3fb3dfc23dca874bdc0d21d
BUG: 1086755
Signed-off-by: Raghavendra G <rgowdapp@redhat.com>
Reviewed-on: http://review.gluster.org/7903
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Humble Devassy Chirammal <humble.devassy@gmail.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Tested-by: Vijay Bellur <vbellur@redhat.com>
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Raghavendra G 2014-05-28 15:12:42 +05:30 committed by Vijay Bellur
parent a181282d14
commit 57df032636
1 changed files with 14 additions and 0 deletions
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doc/features/readdir-ahead.md Normal file
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## Readdir-ahead ##
### Summary ###
Provide read-ahead support for directories to improve sequential directory read performance.
### Owners ###
Brian Foster
### Detailed Description ###
The read-ahead feature for directories is analogous to read-ahead for files. The objective is to detect sequential directory read operations and establish a pipeline for directory content. When a readdir request is received and fulfilled, preemptively issue subsequent readdir requests to the server in anticipation of those requests from the user. If sequential readdir requests are received, the directory content is already immediately available in the client. If subsequent requests are not sequential or not received, said data is simply dropped and the optimization is bypassed.
readdir-ahead is currently disabled by default. It can be enabled with the following command:
gluster volume set <volname> readdir-ahead on