[Gluster-users] Renaming issue

Wed Aug 6 15:03:24 UTC 2014

 Hi,

Version: gluster 3.4.2
Use case: on one node a target file is updated while another node is reading it. 
Issue: only about half of the read succeeds.
The strategy elected is to write to a temporary file then rename the temporary file to the target file.
During file renaming the gluster log from the reading node complains about stale file handle amongst other things:

[2014-08-06 13:54:24.653951] W [fuse-resolve.c:147:fuse_resolve_gfid_cbk] 0-fuse: f98aa46f-0e37-49bc-b578-8e70bec57a7f: failed to resolve (Invalid argument)
[2014-08-06 13:54:24.653983] E [fuse-bridge.c:1996:fuse_open_resume] 0-glusterfs-fuse: 428919: OPEN f98aa46f-0e37-49bc-b578-8e70bec57a7f resolution failed
[2014-08-06 13:54:24.754741] W [client-rpc-fops.c:2697:client3_3_readv_cbk] 0-gv0-client-0: remote operation failed: No such file or directory
[2014-08-06 13:54:24.755263] W [client-rpc-fops.c:1179:client3_3_fgetxattr_cbk] 0-gv0-client-0: remote operation failed: No such file or directory
[2014-08-06 13:54:24.755302] E [dht-helper.c:725:dht_migration_complete_check_task] 0-gv0-dht: (null): failed to get the 'linkto' xattr No such file or directory
[2014-08-06 13:54:24.755347] W [fuse-bridge.c:2089:fuse_readv_cbk] 0-glusterfs-fuse: 428921: READ => -1 (No such file or directory)
[2014-08-06 13:54:24.755687] W [client-rpc-fops.c:2697:client3_3_readv_cbk] 0-gv0-client-0: remote operation failed: No such file or directory
[2014-08-06 13:54:24.756193] W [client-rpc-fops.c:1179:client3_3_fgetxattr_cbk] 0-gv0-client-0: remote operation failed: No such file or directory
[2014-08-06 13:54:24.756232] E [dht-helper.c:725:dht_migration_complete_check_task] 0-gv0-dht: (null): failed to get the 'linkto' xattr No such file or directory
[2014-08-06 13:54:24.756267] W [fuse-bridge.c:2089:fuse_readv_cbk] 0-glusterfs-fuse: 428922: READ => -1 (No such file or directory)
[2014-08-06 13:54:24.756794] W [client-rpc-fops.c:2697:client3_3_readv_cbk] 0-gv0-client-0: remote operation failed: No such file or directory
[2014-08-06 13:54:24.757292] W [client-rpc-fops.c:1179:client3_3_fgetxattr_cbk] 0-gv0-client-0: remote operation failed: No such file or directory
[2014-08-06 13:54:24.757324] E [dht-helper.c:725:dht_migration_complete_check_task] 0-gv0-dht: (null): failed to get the 'linkto' xattr No such file or directory
[2014-08-06 13:54:24.757356] W [fuse-bridge.c:2089:fuse_readv_cbk] 0-glusterfs-fuse: 428924: READ => -1 (No such file or directory)
[2014-08-06 13:54:24.958465] W [client-rpc-fops.c:2697:client3_3_readv_cbk] 0-gv0-client-0: remote operation failed: No such file or directory
[2014-08-06 13:54:24.959020] W [client-rpc-fops.c:1179:client3_3_fgetxattr_cbk] 0-gv0-client-0: remote operation failed: No such file or directory
[2014-08-06 13:54:24.959059] E [dht-helper.c:725:dht_migration_complete_check_task] 0-gv0-dht: (null): failed to get the 'linkto' xattr No such file or directory
[2014-08-06 13:54:24.959100] W [fuse-bridge.c:2089:fuse_readv_cbk] 0-glusterfs-fuse: 428929: READ => -1 (No such file or directory)
[2014-08-06 13:54:24.959420] W [client-rpc-fops.c:2697:client3_3_readv_cbk] 0-gv0-client-0: remote operation failed: No such file or directory
[2014-08-06 13:54:24.959885] W [client-rpc-fops.c:1179:client3_3_fgetxattr_cbk] 0-gv0-client-0: remote operation failed: No such file or directory
[2014-08-06 13:54:24.959912] E [dht-helper.c:725:dht_migration_complete_check_task] 0-gv0-dht: (null): failed to get the 'linkto' xattr No such file or directory
[2014-08-06 13:54:24.959949] W [fuse-bridge.c:2089:fuse_readv_cbk] 0-glusterfs-fuse: 428930: READ => -1 (No such file or directory)
[2014-08-06 13:54:24.960420] W [client-rpc-fops.c:2697:client3_3_readv_cbk] 0-gv0-client-0: remote operation failed: No such file or directory
[2014-08-06 13:54:24.960940] W [client-rpc-fops.c:1179:client3_3_fgetxattr_cbk] 0-gv0-client-0: remote operation failed: No such file or directory
[2014-08-06 13:54:24.960966] E [dht-helper.c:725:dht_migration_complete_check_task] 0-gv0-dht: (null): failed to get the 'linkto' xattr No such file or directory
[2014-08-06 13:54:24.960993] W [fuse-bridge.c:2089:fuse_readv_cbk] 0-glusterfs-fuse: 428932: READ => -1 (No such file or directory)
[2014-08-06 13:54:25.161921] W [client-rpc-fops.c:526:client3_3_stat_cbk] 0-gv0-client-0: remote operation failed: No such file or directory
[2014-08-06 13:54:25.263287] W [client-rpc-fops.c:526:client3_3_stat_cbk] 0-gv0-client-0: remote operation failed: No such file or directory
[2014-08-06 13:54:25.364792] W [client-rpc-fops.c:526:client3_3_stat_cbk] 0-gv0-client-0: remote operation failed: No such file or directory
[2014-08-06 13:54:25.466796] W [client-rpc-fops.c:526:client3_3_stat_cbk] 0-gv0-client-0: remote operation failed: No such file or directory
[2014-08-06 13:54:25.568329] W [client-rpc-fops.c:2624:client3_3_lookup_cbk] 0-gv0-client-0: remote operation failed: Stale file handle. Path: /target_file (f98aa46f-0e37-49bc-b578-8e70bec57a7f)
[2014-08-06 13:54:25.568381] W [client-rpc-fops.c:2624:client3_3_lookup_cbk] 0-gv0-client-1: remote operation failed: Stale file handle. Path: /target_file (f98aa46f-0e37-49bc-b578-8e70bec57a7f)

I tried using RSYNC_FRIENDLY_NAME so that the file name hashing is the same for the temporary and target file (all my temporary file follows the rsync pattern ".<target filename>.tmp") but the issue remains.

Is there a way to make the "renaming" atomic? If not what is the best strategy to use when a node tries to read a file while another tries to update it?

Thanks,

Louis
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