[Gluster-users] question about info and info.tmp

[Atin Mukherjee]

Did you run out of disk space by any chance? AFAIK, the code is like we
write new stuffs to .tmp file and rename it back to the original file. In
case of a disk space issue I expect both the files to be of non zero size.
But having said that I vaguely remember a similar issue (in the form of a
bug or an email) landed up once but we couldn't reproduce it, so something
is wrong with the atomic update here is what I guess. I'll be glad if you
have a reproducer for the same and then we can dig into it further.

On Thu, Nov 10, 2016 at 1:32 PM, songxin <songxin_1980 at 126.com> wrote:

> Hi,
> When I start the glusterd some error happened.
> And the log is following.
>
> [2016-11-08 07:58:34.989365] I [MSGID: 100030] [glusterfsd.c:2318:main]
> 0-/usr/sbin/glusterd: Started running /usr/sbin/glusterd version 3.7.6
> (args: /usr/sbin/glusterd -p /var/run/glusterd.pid --log-level INFO)
> [2016-11-08 07:58:34.998356] I [MSGID: 106478] [glusterd.c:1350:init]
> 0-management: Maximum allowed open file descriptors set to 65536
> [2016-11-08 07:58:35.000667] I [MSGID: 106479] [glusterd.c:1399:init]
> 0-management: Using /system/glusterd as working directory
> [2016-11-08 07:58:35.024508] I [MSGID: 106514] [glusterd-store.c:2075:glusterd_restore_op_version]
> 0-management: Upgrade detected. Setting op-version to minimum : 1
> *[2016-11-08 07:58:35.025356] E [MSGID: 106206]
> [glusterd-store.c:2562:glusterd_store_update_volinfo] 0-management: Failed
> to get next store iter *
> *[2016-11-08 07:58:35.025401] E [MSGID: 106207]
> [glusterd-store.c:2844:glusterd_store_retrieve_volume] 0-management: Failed
> to update volinfo for c_glusterfs volume *
> *[2016-11-08 07:58:35.025463] E [MSGID: 106201]
> [glusterd-store.c:3042:glusterd_store_retrieve_volumes] 0-management:
> Unable to restore volume: c_glusterfs *
> *[2016-11-08 07:58:35.025544] E [MSGID: 101019] [xlator.c:428:xlator_init]
> 0-management: Initialization of volume 'management' failed, review your
> volfile again *
> *[2016-11-08 07:58:35.025582] E [graph.c:322:glusterfs_graph_init]
> 0-management: initializing translator failed *
> *[2016-11-08 07:58:35.025629] E [graph.c:661:glusterfs_graph_activate]
> 0-graph: init failed *
> [2016-11-08 07:58:35.026109] W [glusterfsd.c:1236:cleanup_and_exit]
> (-->/usr/sbin/glusterd(glusterfs_volumes_init-0x1b260) [0x1000a718]
> -->/usr/sbin/glusterd(glusterfs_process_volfp-0x1b3b8) [0x1000a5a8]
> -->/usr/sbin/glusterd(cleanup_and_exit-0x1c02c) [0x100098bc] ) 0-:
> received signum (0), shutting down
>
>
> And then I found that the size of vols/volume_name/info is 0.It cause
> glusterd shutdown.
> But I found that vols/volume_name_info.tmp is not 0.
> And I found that there is a brick file vols/volume_name/bricks/xxxx.brick
> is 0, but vols/volume_name/bricks/xxxx.brick.tmp is not 0.
>
> I read the function code glusterd_store_volinfo () in glusterd-store.c .
> I know that the info.tmp will be rename to info in function
> glusterd_store_volume_atomic_update().
>
> But my question is that why the info file is 0 but info.tmp is not 0.
>
>
> Thanks,
> Xin
>
>
>
>
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>



-- 

~ Atin (atinm)
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