[Gluster-devel] Files not available in all clients immediately

Claudio Cuqui claudio at c3systems.com.br
Tue Mar 18 19:47:52 UTC 2008


Hi Avati,

First at all, thank you very much for your time and help !  I will  
upgrade all servers and as soon as I finish I will let you know.

Best Regards !

Cuqui

Anand Avati wrote:
> Claudio,
>  Can you try with glusterfs--mainline--2.5--patch-709 ? A similar 
> issue is addressed in that revision. We are interested to know if that 
> solves your issue as well.
>
> thanks,
>
> avati
>
> 2008/3/19, Claudio Cuqui <claudio at c3systems.com.br 
> <mailto:claudio at c3systems.com.br>>:
>
>     Hi there !
>
>     We are using gluster on an environment with multiple webservers
>     and load
>     balancer, where we have only one server and multiple clients (6).
>     All servers are running Fedora Core 6 X86_64 with kernel
>     2.6.22.14-72.fc6 (with exactly same packages installed in all server).
>     The gluster version used is 1.3.8pre2 + 2.7.2glfs8 (both compiled
>     locally). The underlying FS is reiserfs mounted with the follow
>     options
>     rw,noatime,nodiratime,notail. This filesystem has almost 4 thousand
>     files from 2k - 10Mb in size. We are using gluster to export this
>     filesystem for all other webservers. Below the config file used by
>     gluster server:
>
>     ### Export volume "brick" with the contents of "/home/export"
>     directory.
>     volume attachments-nl
>       type storage/posix                   # POSIX FS translator
>       option directory
>     /C3Systems/data/domains/webmail.pop.com.br/attachments
>     end-volume
>
>     volume attachments
>       type features/posix-locks
>       subvolumes attachments-nl
>       option mandatory on
>     end-volume
>
>
>     ### Add network serving capability to above brick.
>     volume server
>       type protocol/server
>       option transport-type tcp/server     # For TCP/IP transport
>       option client-volume-filename
>     /C3Systems/gluster/bin/etc/glusterfs/glusterfs-client.vol
>       subvolumes attachments-nl attachments
>       option auth.ip.attachments-nl.allow * # Allow access to
>     "attachments-nl" volume
>       option auth.ip.attachments.allow * # Allow access to
>     "attachments" volume
>     end-volume
>
>     The problem happen when the LB sent the post (the uploaded file)
>     to one
>     webserver and than the next post goes to other webserver  that try to
>     access the same file. When this happen, the other client got these
>     messages:
>
>     PHP Warning:
>     fopen(/C3Systems/data/domains/c3systems.com.br/attachments/27gBgFQSIiOLDEo7AvxlpsFkqZw9jdnZ):
>     failed to open stream: File Not Found.
>     PHP Warning:
>     unlink(/C3Systems/data/domains/c3systems.com.br/attachments/5Dech7jNxjORZ2cZ9IAbR7kmgmgn2vTE):
>     File Not Found.
>
>     LB is using RoundRobin to distribute the load between servers.
>
>     Below, you can find the gluster configuration file used by all
>     clients:
>
>     ### file: client-volume.spec.sample
>
>     ##############################################
>     ###  GlusterFS Client Volume Specification  ##
>     ##############################################
>
>     #### CONFIG FILE RULES:
>     ### "#" is comment character.
>     ### - Config file is case sensitive
>     ### - Options within a volume block can be in any order.
>     ### - Spaces or tabs are used as delimitter within a line.
>     ### - Each option should end within a line.
>     ### - Missing or commented fields will assume default values.
>     ### - Blank/commented lines are allowed.
>     ### - Sub-volumes should already be defined above before referring.
>
>     ### Add client feature and attach to remote subvolume
>     volume client
>       type protocol/client
>       option transport-type tcp/client     # for TCP/IP transport
>     # option ib-verbs-work-request-send-size  1048576
>     # option ib-verbs-work-request-send-count 16
>     # option ib-verbs-work-request-recv-size  1048576
>     # option ib-verbs-work-request-recv-count 16
>     # option transport-type ib-sdp/client  # for Infiniband transport
>     # option transport-type ib-verbs/client # for ib-verbs transport
>       option remote-host 1.2.3.4 <http://1.2.3.4>      # IP address of
>     the remote brick
>     # option remote-port 6996              # default server port is 6996
>
>     # option transport-timeout 30          # seconds to wait for a reply
>                                            # from server for each request
>       option remote-subvolume attachments  # name of the remote volume
>     end-volume
>
>     ### Add readahead feature
>     volume readahead
>       type performance/read-ahead
>       option page-size 1MB     # unit in bytes
>       option page-count 2       # cache per file  = (page-count x
>     page-size)
>       subvolumes client
>     end-volume
>
>     ### Add IO-Cache feature
>     volume iocache
>       type performance/io-cache
>       option page-size 256KB
>       option page-count 2
>       subvolumes readahead
>     end-volume
>
>     ### Add writeback feature
>     #volume writeback
>     #  type performance/write-behind
>     #  option aggregate-size 1MB
>     #  option flush-behind off
>     #  subvolumes iocache
>     #end-volume
>
>     When I do the test manually, everything goes fine. What I think is
>     happening is that gluster isn´t having enough time to sync all clients
>     before clients trying to access the files (those servers are very busy
>     ones.....they receive millions of requests per day).
>
>     Is this configuration appropriate for this situation ? a bug ? a
>     feature
>     ;-) ? Is there any option like the sync used in NFS that I can use in
>     order guarantee that when the file is write down, all the clients
>     already
>     have it ?
>
>     TIA,
>
>     Claudio Cuqui
>
>
>
>
>
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>
>
>
>
> -- 
> If I traveled to the end of the rainbow
> As Dame Fortune did intend,
> Murphy would be there to tell me
> The pot's at the other end. 





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