[LU-8029] Lustre_rsync does not sync files modified

• Type: Bug
• Resolution: Incomplete
• Priority: Major
• Affects Version/s: Lustre 2.8.0
• Severity: 3
• Assignee: WC Triage
• Reporter: Tatsushi Takamura

Description

Since changelog does not record the activity of append-writing a file properly, lustre_rsync does not sync files modified.

To reproduce, do the following:

# echo bbb >> /lustre/file
# lfs changelog lustre-MDT0000
388 11CLOSE 09:51:49.93058314 2016.04.12 0x442 t=[0x200000405:0x45:0x0]
# cat /lustre/file
aaa
bbb
# lustre_rsync  --source=/lustre --target=/mnt/lustre-rsync --mdt=lustre-MDT0000 --user=cl1
# cat /mnt/lustre-rsync/file
aaa

I see the changelog only register CLOSE event (no MTIME event) when a file is modified.
But, lustre_rysnc ignores this entry and does nothing.

                case CL_CLOSE:                                                                                                                                                    
                case CL_EXT:                                                                                                                                                      
                case CL_OPEN:                                                                                                                                                     
                case CL_LAYOUT:                                                                                                                                                   
                case CL_MARK:                                                                                                                                                     
                        /* Nothing needs to be done for these entries */                                                                                                          
                        /* fallthrough */ 

I think lustre_rsync should detect file data changes by CLOSE event and CLOSE event should trigger file copying
(According to LU-2298, it seems to be hard for changelog to register MTIME event by file data changes).