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glusterd: Fail add-brick on replica count change, if brick is down

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Problem:
1. Have a replica 2 volume with bricks b1 and b2
2. Before setting the layout, b1 goes down
3. Set the layout write some data, which gets populated on b2
4. b2 goes down then b1 comes up
5. Add another brick b3, and heal will take place from b1 to b3, which
   basically have no data
6. Write some data. Both b1 and b3 will mark b2 for pending writes
7. b1 goes down, and b2 comes up
8. b2 gets heald from b1. During heal it removes the data which is already
   in b2, considering that as stale data. This leads to data loss.

Solution:
1. In glusterd stage-op, while adding bricks, check whether the replica
   count is being increased
2. If yes, then check whether any of the bricks are down at that time
3. If yes, then fail the add-brick to avoid such data loss
4. Else continue the normal operation.

This check will work enen when we convert plain distribute volume to replicate

Test:
1. Create a replica 2 volume
2. Kill one brick from the volume
3. Try adding a brick to the volume
4. It should fail with all bricks are not up error
5. Cretae a distribute volume and kill one of the brick
6. Try to convert it to replicate volume, by adding bricks.
7. This should also fail.

Change-Id: I9c8d2ab104263e4206814c94c19212ab914ed07c
BUG: 1406411
Signed-off-by: karthik-us <ksubrahm@redhat.com>
Reviewed-on: http://review.gluster.org/16330
Tested-by: Ravishankar N <ravishankar@redhat.com>
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: N Balachandran <nbalacha@redhat.com>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
This commit is contained in:
karthik-us
2017-01-05 14:06:21 +05:30
committed by Atin Mukherjee
parent 395c554837
commit c916a2ffc2
3 changed files with 66 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
tests/basic/afr/arbiter-add-brick.t
View File

@@ -10,6 +10,7 @@ TEST pidof glusterd
TEST $CLI volume create $V0 replica 2 $H0:$B0/${V0}{0,1}
TEST $CLI volume set $V0 performance.stat-prefetch off
TEST $CLI volume start $V0
TEST $CLI volume set $V0 self-heal-daemon off
TEST glusterfs --volfile-id=$V0 --volfile-server=$H0 $M0;
TEST mkdir $M0/dir1
TEST dd if=/dev/urandom of=$M0/file1 bs=1024 count=1
@@ -20,21 +21,24 @@ TEST mkdir $M0/dir2
TEST dd if=/dev/urandom of=$M0/file1 bs=1024 count=1024
#convert replica 2 to arbiter volume
TEST $CLI volume start $V0 force
EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V0 $H0 $B0/${V0}1
#syntax check for add-brick.
TEST ! $CLI volume add-brick $V0 replica 2 arbiter 1 $H0:$B0/${V0}2
TEST ! $CLI volume add-brick $V0 replica 3 arbiter 2 $H0:$B0/${V0}2
#convert replica 2 to arbiter volume
TEST $CLI volume add-brick $V0 replica 3 arbiter 1 $H0:$B0/${V0}2
EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V0 $H0 $B0/${V0}2
#Heal files
TEST $CLI volume start $V0 force
EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V0 $H0 $B0/${V0}1
TEST $CLI volume set $V0 self-heal-daemon on
EXPECT_WITHIN $PROCESS_UP_TIMEOUT "Y" glustershd_up_status
EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 0
EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 1
EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 2
TEST $CLI volume heal $V0
EXPECT_WITHIN $HEAL_TIMEOUT "0" get_pending_heal_count $V0
#Perform I/O after add-brick

40
tests/bugs/glusterd/bug-1406411-fail-add-brick-on-replica-count-change.t Normal file
View File

@@ -0,0 +1,40 @@
#!/bin/bash
. $(dirname $0)/../../include.rc
. $(dirname $0)/../../volume.rc
cleanup;
TEST glusterd;
TEST pidof glusterd
TEST $CLI volume create $V0 replica 2 $H0:$B0/${V0}{1,2};
TEST $CLI volume start $V0
EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V0 $H0 $B0/${V0}1
EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V0 $H0 $B0/${V0}2
TEST kill_brick $V0 $H0 $B0/${V0}1
#add-brick should fail
TEST ! $CLI volume add-brick $V0 replica 3 $H0:$B0/${V0}3
TEST $CLI volume start $V0 force
EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V0 $H0 $B0/${V0}1
EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V0 $H0 $B0/${V0}2
TEST $CLI volume add-brick $V0 replica 3 $H0:$B0/${V0}3
TEST $CLI volume create $V1 $H0:$B0/${V1}{1,2};
TEST $CLI volume start $V1
EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V1 $H0 $B0/${V1}1
EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V1 $H0 $B0/${V1}2
TEST kill_brick $V1 $H0 $B0/${V1}1
#add-brick should fail
TEST ! $CLI volume add-brick $V1 replica 2 $H0:$B0/${V1}{3,4}
TEST $CLI volume start $V1 force
EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V1 $H0 $B0/${V1}1
EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" brick_up_status $V1 $H0 $B0/${V1}2
TEST $CLI volume add-brick $V1 replica 2 $H0:$B0/${V1}{3,4}
cleanup;

19
xlators/mgmt/glusterd/src/glusterd-brick-ops.c
View File

@@ -1724,6 +1724,25 @@ glusterd_op_stage_add_brick (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
}
}
if (volinfo->replica_count < replica_count) {
cds_list_for_each_entry (brickinfo, &volinfo->bricks,
brick_list) {
if (gf_uuid_compare (brickinfo->uuid, MY_UUID))
continue;
if (brickinfo->status == GF_BRICK_STOPPED) {
ret = -1;
snprintf (msg, sizeof (msg), "Brick %s is down,"
" changing replica count needs all "
"the bricks to be up to avoid data "
"loss", brickinfo->path);
gf_msg (THIS->name, GF_LOG_ERROR, 0,
GD_MSG_BRICK_ADD_FAIL, "%s", msg);
*op_errstr = gf_strdup (msg);
goto out;
}
}
}
if (conf->op_version > GD_OP_VERSION_3_7_5 &&
is_origin_glusterd (dict)) {
ret = glusterd_validate_quorum (this, GD_OP_ADD_BRICK, dict,