On 03/29/2015 02:23 PM, Emmanuel Dreyfus wrote:
Pranith Kumar Karampuri <pkarampu@xxxxxxxxxx> wrote:
I see split-brain-resolution.t uses attribute replica.split-brain-choice
to choose what replica should be used. This attribute is not in
privilegied space (trusted. prefixed). Is it on purpose?
Yes, these are used as internal commands to make a choice when file is
in split-brain.
Here is how the feature is broken on NetBSD:
setting split-brain-resolution.t causes afr inode context's spb_choice
to be set to the desired source. That works.
But when I try to read from the file, spb_choice is -1. This is because
in the meantime, the context has been destroyed by afr_destroy()
and reallocated with sbp_choice set to default value -1.
Since spb_choice is not saved as an attribute for the file on the
bricks, it cannot be recovered when the context is reallocated. Either
that "save" feature has been forgotten, or going to afr_destroy() here
is a bug. Here is the backtrace leading there:
This is a known issue :-(. I will need to talk to Anuradha once about
this issue. She is not in today. Will let you know about the decision.
Pranith
0xbb751313 <_gf_msg_backtrace_nomem+0xc0> at /autobuild/install/lib/libglusterfs.so.0
0xb9b441af <afr_forget+0x89> at /autobuild/install/lib/glusterfs/3.7dev/xlator/cluster/replicate.so
0xbb771801 <gf_timer_registry_destroy+0xc58> at /autobuild/install/lib/libglusterfs.so.0
0xbb7718af <gf_timer_registry_destroy+0xd06> at /autobuild/install/lib/libglusterfs.so.0
0xbb773a38 <inode_table_set_lru_limit+0x16a> at /autobuild/install/lib/libglusterfs.so.0
0xbb771dd4 <inode_unref+0x5d> at /autobuild/install/lib/libglusterfs.so.0
0xbb277518 <fuse_lookup_resume+0x723> at /autobuild/install/lib/glusterfs/3.7dev/xlator/mount/fuse.so
0xbb277639 <fuse_lookup_resume+0x844> at /autobuild/install/lib/glusterfs/3.7dev/xlator/mount/fuse.so
0xbb28d70f <fuse_get_mount_status+0x7af> at /autobuild/install/lib/glusterfs/3.7dev/xlator/mount/fuse.so
0xbb6a2bca <__libc_thr_exit+0x1f8> at /usr/lib/libpthread.so.1
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