Re: [PATCH 2/6] chunkd: change the prefix length of object pathname from 4 to 3

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On 01/11/2010 07:25 AM, Akinobu Mita wrote:
The volume directory may have 2^16 (=65536) directories because
prefix length of object pathname is 4 bytes. But ext3 filesystem can
only have EXT_LINK_MAX (32000) directories.

This changes the prefix length from 4 bytes to 3 bytes and breaks
the volume data format compatibility with older version.

Now the maximum count of links in volume directory is 2^12 (=4096)
and it doesn't exceed ext3's upper limit of max links.

Signed-off-by: Akinobu Mita<akinobu.mita@xxxxxxxxx>
---
  server/be-fs.c |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)

hey, welcome, new contributor!

This patch makes sense, but it also raises the question of whether or not we should move to a two-level directory scheme, eg.

	123/456/7890ABCDEF
    rather than
	123/4567890ABCDEF

to limit the size of the top-level directories. It really depends on the object counts a typical chunkd node will be seeing. As with the other patch, I will give this some thought after sleep.

Comments welcome!

	Jeff




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