+++ This bug was initially created as a clone of Bug #1205540 +++ Description of problem: ======================= In a tiered volume, when we detach a tier, the operation passes successfully, but doesnt flush data to cold tier. This leads to data loss. Version-Release number of selected component (if applicable): ============================================================ 3.7 upstream nightlies build http://download.gluster.org/pub/gluster/glusterfs/nightly/glusterfs/epel-6-x86_64/glusterfs-3.7dev-0.777.git2308c07.autobuild/ How reproducible: ================= Easy to reproduce Steps to Reproduce: ================== 1.create a gluster volume(i created a distribute type) and start the volume 2.attach a tier to the volume using attach-tier 3.now write some files to the volume. All files(if sufficient space available) will be written to the hot-tier 4. Now detach the tier using detach-tier command. Actual results: =============== When we detach the tier, the tier gets detached without flushing the data in hot tier to cold. Due to this there is data loss Expected results: ================ Detach tier should succeed only after all data is flushed to cold tier. Additional info(CLI logs): =============== [root@rhs-client44 everglades]# gluster v info vol1 Volume Name: vol1 Type: Distribute Volume ID: 3382e788-ee37-4d6c-b214-8469ca68e376 Status: Started Number of Bricks: 3 Transport-type: tcp Bricks: Brick1: rhs-client44:/pavanbrick1/vol1/b1 Brick2: rhs-client38:/pavanbrick1/vol1/b1 Brick3: rhs-client37:/pavanbrick1/vol1/b1 [root@rhs-client44 everglades]# gluster v status vol1 Status of volume: vol1 Gluster process TCP Port RDMA Port Online Pid ------------------------------------------------------------------------------ Brick rhs-client44:/pavanbrick1/vol1/b1 49152 0 Y 29969 Brick rhs-client38:/pavanbrick1/vol1/b1 49152 0 Y 30514 Brick rhs-client37:/pavanbrick1/vol1/b1 49152 0 Y 29475 NFS Server on localhost 2049 0 Y 29993 NFS Server on rhs-client38 2049 0 Y 30538 NFS Server on rhs-client37 2049 0 Y 29499 Task Status of Volume vol1 ------------------------------------------------------------------------------ There are no active volume tasks [root@rhs-client44 everglades]# gluster v attach-tier vol1 rhs-client44:/pavanbrick2/vol1_hot/hb1 rhs-client37:/pavanbrick2/vol1_hot/hb1 volume add-brick: success [root@rhs-client44 everglades]# gluster v info vol1 Volume Name: vol1 Type: Tier Volume ID: 3382e788-ee37-4d6c-b214-8469ca68e376 Status: Started Number of Bricks: 5 x 1 = 5 Transport-type: tcp Bricks: Brick1: rhs-client37:/pavanbrick2/vol1_hot/hb1 Brick2: rhs-client44:/pavanbrick2/vol1_hot/hb1 Brick3: rhs-client44:/pavanbrick1/vol1/b1 Brick4: rhs-client38:/pavanbrick1/vol1/b1 Brick5: rhs-client37:/pavanbrick1/vol1/b1 [root@rhs-client44 everglades]# gluster v detach-tier vol1 volume remove-brick unknown: success [root@rhs-client44 everglades]# gluster v info vol1 Volume Name: vol1 Type: Distribute Volume ID: 3382e788-ee37-4d6c-b214-8469ca68e376 Status: Started Number of Bricks: 3 Transport-type: tcp Bricks: Brick1: rhs-client44:/pavanbrick1/vol1/b1 Brick2: rhs-client38:/pavanbrick1/vol1/b1 Brick3: rhs-client37:/pavanbrick1/vol1/b1 --- Additional comment from Anand Avati on 2015-04-01 18:56:08 EDT --- REVIEW: http://review.gluster.org/10108 (glusterd: WIP support for tier volumes 'detach start' and 'detach commit') posted (#1) for review on master by Dan Lambright (dlambrig) --- Additional comment from Anand Avati on 2015-04-07 07:14:48 EDT --- REVIEW: http://review.gluster.org/10108 (glusterd: WIP support for tier volumes 'detach start' and 'detach commit') posted (#2) for review on master by Dan Lambright (dlambrig) --- Additional comment from Anand Avati on 2015-04-09 06:08:37 EDT --- REVIEW: http://review.gluster.org/10108 (glusterd: WIP support for tier volumes 'detach start' and 'detach commit') posted (#3) for review on master by Dan Lambright (dlambrig) --- Additional comment from Anand Avati on 2015-04-14 00:12:50 EDT --- REVIEW: http://review.gluster.org/10108 (glusterd: support for tier volumes 'detach start' and 'detach commit') posted (#4) for review on master by Dan Lambright (dlambrig) --- Additional comment from Anand Avati on 2015-04-16 06:19:59 EDT --- REVIEW: http://review.gluster.org/10108 (glusterd: support for tier volumes 'detach start' and 'detach commit') posted (#5) for review on master by Dan Lambright (dlambrig) --- Additional comment from Anand Avati on 2015-04-18 07:59:25 EDT --- REVIEW: http://review.gluster.org/10108 (glusterd: support for tier volumes 'detach start' and 'detach commit') posted (#6) for review on master by Dan Lambright (dlambrig) --- Additional comment from Anand Avati on 2015-04-21 16:52:11 EDT --- REVIEW: http://review.gluster.org/10108 (glusterd: support for tier volumes 'detach start' and 'detach commit') posted (#7) for review on master by Dan Lambright (dlambrig) --- Additional comment from Anand Avati on 2015-04-22 06:20:24 EDT --- REVIEW: http://review.gluster.org/10108 (glusterd: support for tier volumes 'detach start' and 'detach commit') posted (#8) for review on master by Dan Lambright (dlambrig) --- Additional comment from Anand Avati on 2015-04-22 10:39:46 EDT --- REVIEW: http://review.gluster.org/10108 (glusterd: support for tier volumes 'detach start' and 'detach commit') posted (#9) for review on master by Kaleb KEITHLEY (kkeithle) --- Additional comment from Anand Avati on 2015-04-22 10:51:06 EDT --- COMMIT: http://review.gluster.org/10108 committed in master by Kaleb KEITHLEY (kkeithle) ------ commit 86b02afab780e559e82399b9e96381d8df594ed6 Author: Dan Lambright <dlambrig> Date: Mon Apr 13 02:42:12 2015 +0100 glusterd: support for tier volumes 'detach start' and 'detach commit' These commands work in a manner analagous to rebalancing when removing a brick. The existing migration daemon detects "detach start" and switches to moving data off the hot tier. While in this state all lookups are directed to the cold tier. gluster v detach-tier <vol> start gluster v detach-tier <vol> commit The status and stop cli commands shall be submitted separately. Change-Id: I24fda5cc3ba74f5fb8aa9a3234ad51f18b80a8a0 BUG: 1205540 Signed-off-by: Dan Lambright <dlambrig> Signed-off-by: root <root> Signed-off-by: Dan Lambright <dlambrig> Reviewed-on: http://review.gluster.org/10108 Reviewed-by: Kaleb KEITHLEY <kkeithle> Tested-by: NetBSD Build System
REVIEW: http://review.gluster.org/10647 (glusterd: support for tier volumes 'detach start' and 'detach commit') posted (#1) for review on release-3.7 by Dan Lambright (dlambrig)
REVIEW: http://review.gluster.org/10647 (glusterd: support for tier volumes 'detach start' and 'detach commit') posted (#2) for review on release-3.7 by Dan Lambright (dlambrig)
Reproduced this ont the BETA2 build too, hence moving it to ASSIGNED.
Well, the DHT rebalance code changed (parallel rebalancing performance fix). When it changed, tiering broke. I see the problem and have discussed with Du, a fix should come in shortly.