Ilya Dryomov f18650ace3 crush: apply chooseleaf_tries to firstn mode too ... Parameterize the attempts for the _firstn choose method, and apply the rule-specified tries count to firstn mode as well. Note that we have slightly different behavior here than with indep: If the firstn value is not specified for firstn, we pass through the normal attempt count. This maintains compatibility with legacy behavior. Note that this is usually *not* actually N^2 work, though, because of the descend_once tunable. However, descend_once is unfortunately *not* the same thing as 1 chooseleaf try because it is only checked on a reject but not on a collision. Sigh. In contrast, for indep, if tries is not specified we default to 1 recursive attempt, because that is simply more sane, and we have the option to do so. The descend_once tunable has no effect for indep. Reflects ceph.git commit 64aeded50d80942d66a5ec7b604ff2fcbf5d7b63. Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com> Reviewed-by: Sage Weil <sage@inktank.com>		2013-12-31 20:32:22 +02:00
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crush.h	crush: apply chooseleaf_tries to firstn mode too	2013-12-31 20:32:22 +02:00
hash.h	ceph: factor out libceph from Ceph file system	2010-10-20 15:37:28 -07:00
mapper.h	crush: eliminate CRUSH_MAX_SET result size limitation	2013-12-31 20:32:14 +02:00