[Gluster-devel] glusterfs blocked.

[yang.bin18 at zte.com.cn]

>> I add some private function in dht_create() as bellow.
>> 
>> When current pwd is not "/",everything is ok,otherwise,syncop_getxattr 
will
>> be blocked(In target subvol,"server3_3_getxatt" did not run ).
>> 
>> 
>> dict_t *xattr = NULL;
>> loc_t loc = {0, };
>> memset (loc.gfid, 0, 16);
>> loc.gfid[15] = 1;
>> ret = syncop_getxattr (subvol, &loc, &xattr,GF_XATTR_PATHINFO_KEY);
>Could you post your private patch in this thread? It would be useful to 
>discuss the specifics of why glusterfs is blocked.

>syncop_XXX functions should be called only from threads other than
>threads executing event_dispatch_epoll_handler. You could attach gdb to 
your hung
>process and confirm that the syncop_getxattr call is executing on a 
thread that has
>event_dispatch_epoll_handler early on its stack.

>What is the goal of your private patch? If I may guess, are you trying
>to create files on a brick that is on the same machine as your mount 
point,
>when possible? If so, DHT has Non-uniform file allocation policy (NUFA) 
analagous
>to NUMA in memory architectures.
>For more information, see 
https://github.com/gluster/glusterfs/blob/master/doc/admin-guide/en-US/markdown/admin_managing_volumes.md#non-uniform-file-allocation


HTH,
KP

We want to place file on any subvol other than local ,in the contrary of 
NUFA。

From GDB ,syncop_getxattr is on the same backtrace of 
"event_dispatch_epoll_handler" which runing in main thread.So any response 
can not come in ?

Great thanks!

YB




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