[Gluster-devel] Problems with graph switch in disperse

[Raghavendra Gowdappa]

Do you know the origins of EIO? fuse-bridge only fails a lookup fop with EIO (when NULL gfid is received in a successful lookup reply). So, there might be other xlator which is sending EIO.

----- Original Message -----
> From: "Xavier Hernandez" <xhernandez at datalab.es>
> To: "Gluster Devel" <gluster-devel at gluster.org>
> Sent: Wednesday, December 24, 2014 6:25:17 PM
> Subject: [Gluster-devel] Problems with graph switch in disperse
> 
> Hi,
> 
> I'm experiencing a problem when gluster graph is changed as a result of
> a replace-brick operation (probably with any other operation that
> changes the graph) while the client is also doing other tasks, like
> writing a file.
> 
> When operation starts, I see that the replaced brick is disconnected,
> but writes continue working normally with one brick less.
> 
> At some point, another graph is created and comes online. Remaining
> bricks on the old graph are disconnected and the old graph is destroyed.
> I see how new write requests are sent to the new graph.
> 
> This seems correct. However there's a point where I see this:
> 
> [2014-12-24 11:29:58.541130] T [fuse-bridge.c:2305:fuse_write_resume]
> 0-glusterfs-fuse: 2234: WRITE (0x16dcf3c, size=131072, offset=255721472)
> [2014-12-24 11:29:58.541156] T [ec-helpers.c:101:ec_trace] 2-ec:
> WIND(INODELK) 0x7f8921b7a9a4(0x7f8921b78e14) [refs=5, winds=3, jobs=1]
> frame=0x7f8932e92c38/0x7f8932e9e6b0, min/exp=3/3, err=0 state=1
> {111:000:000} idx=0
> [2014-12-24 11:29:58.541292] T [rpc-clnt.c:1384:rpc_clnt_record]
> 2-patchy-client-0: Auth Info: pid: 0, uid: 0, gid: 0, owner:
> d025e932897f0000
> [2014-12-24 11:29:58.541296] T [io-cache.c:133:ioc_inode_flush]
> 2-patchy-io-cache: locked inode(0x16d2810)
> [2014-12-24 11:29:58.541354] T
> [rpc-clnt.c:1241:rpc_clnt_record_build_header] 2-rpc-clnt: Request
> fraglen 152, payload: 84, rpc hdr: 68
> [2014-12-24 11:29:58.541408] T [io-cache.c:137:ioc_inode_flush]
> 2-patchy-io-cache: unlocked inode(0x16d2810)
> [2014-12-24 11:29:58.541493] T [io-cache.c:133:ioc_inode_flush]
> 2-patchy-io-cache: locked inode(0x16d2810)
> [2014-12-24 11:29:58.541536] T [io-cache.c:137:ioc_inode_flush]
> 2-patchy-io-cache: unlocked inode(0x16d2810)
> [2014-12-24 11:29:58.541537] T [rpc-clnt.c:1577:rpc_clnt_submit]
> 2-rpc-clnt: submitted request (XID: 0x17 Program: GlusterFS 3.3,
> ProgVers: 330, Proc: 29) to rpc-transport (patchy-client-0)
> [2014-12-24 11:29:58.541646] W [fuse-bridge.c:2271:fuse_writev_cbk]
> 0-glusterfs-fuse: 2234: WRITE => -1 (Input/output error)
> 
> It seems that fuse still has a write request pending for graph 0. It is
> resumed but it returns EIO without calling the xlator stack (operations
> seen between the two log messages are from other operations and they are
> sent to graph 2). I'm not sure why this happens and how I should aviod this.
> 
> I tried the same scenario with replicate and it seems to work, so there
> must be something wrong in disperse, but I don't see where the problem
> could be.
> 
> Any ideas ?
> 
> Thanks,
> 
> Xavi
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