On Tue, 26 Jul 2016 13:29:03 -0500, Mike Christie wrote: > Did you already try the multi op zero/truncate approach? Did you have to > make changes to the OSD code too? I'm a little stumped by the OSD handling of these requests once truncate is added to the mix... As mentioned, with set-alloc-hint+cmpext(512~512)+write(512~512), the cmpext/sync_read obtains an empty read buffer against the unwritten range. With set-alloc-hint+truncate(4194304)+cmpext(512~512)+write(512~512), the cmpext/sync_read gets ENOENT from the filestore. The truncate immediately prior doesn't appear to hit the filestore - vstart logs below. Cheers, David 7fd9bbfff700 10 osd.2 pg_epoch: 11 pg[0.1( empty local-les=9 n=0 ec=1 les/c/f 9/9/0 8/8/8) [2,0,1] r=0 lpr=8 crt=0'0 mlcod 0'0 active+clean] do_op 0:841a7acf:::rbd_data.100e74b0dc51.0000000000000000:head [set-alloc-hint object_size 4194304 write_size 4194304,truncate 4194304,cmpext 512~512,write 512~512] ov 0'0 av 11'1 snapc 0=[] snapset 0=[]:[] 7fd9bbfff700 10 osd.2 pg_epoch: 11 pg[0.1( empty local-les=9 n=0 ec=1 les/c/f 9/9/0 8/8/8) [2,0,1] r=0 lpr=8 crt=0'0 mlcod 0'0 active+clean] taking ondisk_read_lock 7fd9bbfff700 10 osd.2 pg_epoch: 11 pg[0.1( empty local-les=9 n=0 ec=1 les/c/f 9/9/0 8/8/8) [2,0,1] r=0 lpr=8 crt=0'0 mlcod 0'0 active+clean] do_osd_op 0:841a7acf:::rbd_data.100e74b0dc51.0000000000000000:head [set-alloc-hint object_size 4194304 write_size 4194304,truncate 4194304,cmpext 512~512,write 512~512] 7fd9bbfff700 10 osd.2 pg_epoch: 11 pg[0.1( empty local-les=9 n=0 ec=1 les/c/f 9/9/0 8/8/8) [2,0,1] r=0 lpr=8 crt=0'0 mlcod 0'0 active+clean] do_osd_op set-alloc-hint object_size 4194304 write_size 4194304 7fd9bbfff700 10 osd.2 pg_epoch: 11 pg[0.1( empty local-les=9 n=0 ec=1 les/c/f 9/9/0 8/8/8) [2,0,1] r=0 lpr=8 crt=0'0 mlcod 0'0 active+clean] do_osd_op truncate 4194304 7fd9bbfff700 10 osd.2 pg_epoch: 11 pg[0.1( empty local-les=9 n=0 ec=1 les/c/f 9/9/0 8/8/8) [2,0,1] r=0 lpr=8 crt=0'0 mlcod 0'0 active+clean] do_osd_op cmpext 512~512 7fd9bbfff700 10 osd.2 pg_epoch: 11 pg[0.1( empty local-les=9 n=0 ec=1 les/c/f 9/9/0 8/8/8) [2,0,1] r=0 lpr=8 crt=0'0 mlcod 0'0 active+clean] do_osd_op 0:841a7acf:::rbd_data.100e74b0dc51.0000000000000000:head [sync_read 512~512] 7fd9bbfff700 10 osd.2 pg_epoch: 11 pg[0.1( empty local-les=9 n=0 ec=1 les/c/f 9/9/0 8/8/8) [2,0,1] r=0 lpr=8 crt=0'0 mlcod 0'0 active+clean] do_osd_op sync_read 512~512 7fd9bbfff700 15 filestore(/home/ddiss/isms/ceph/src/dev/osd2) read 0.1_head/#0:841a7acf:::rbd_data.100e74b0dc51.0000000000000000:head# 512~512 7fd9bbfff700 10 filestore(/home/ddiss/isms/ceph/src/dev/osd2) error opening file /home/ddiss/isms/ceph/src/dev/osd2/current/0.1_head/rbd\udata.100e74b0dc51.0000000000000000__head_F35E5821__0 with flags=2: (2) No such file or directory 7fd9bbfff700 10 filestore(/home/ddiss/isms/ceph/src/dev/osd2) FileStore::read(0.1_head/#0:841a7acf:::rbd_data.100e74b0dc51.0000000000000000:head#) open error: (2) No such file or directory 7fd9bbfff700 10 osd.2 pg_epoch: 11 pg[0.1( empty local-les=9 n=0 ec=1 les/c/f 9/9/0 8/8/8) [2,0,1] r=0 lpr=8 crt=0'0 mlcod 0'0 active+clean] read got -2 / 0 bytes from obj 0:841a7acf:::rbd_data.100e74b0dc51.0000000000000000:head 7fd9bbfff700 -1 osd.2 pg_epoch: 11 pg[0.1( empty local-les=9 n=0 ec=1 les/c/f 9/9/0 8/8/8) [2,0,1] r=0 lpr=8 crt=0'0 mlcod 0'0 active+clean] do_extent_cmp do_osd_ops failed -2 7fd9bbfff700 10 osd.2 pg_epoch: 11 pg[0.1( empty local-les=9 n=0 ec=1 les/c/f 9/9/0 8/8/8) [2,0,1] r=0 lpr=8 crt=0'0 mlcod 0'0 active+clean] dropping ondisk_read_lock 7fd9bbfff700 1 -- 192.168.155.1:6808/7807 --> 192.168.155.101:0/3185149525 -- osd_op_reply(78 rbd_data.100e74b0dc51.0000000000000000 [set-alloc-hint object_size 4194304 write_size 4194304,truncate 4194304,cmpext 512~512,write 512~512] v0'0 uv0 ondisk = -2 ((2) No such file or directory)) v7 -- ?+0 0x7fd9d002bde0 con 0x7fda08006230 -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
