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authorRavishankar N <ravishankar@redhat.com>2019-09-28 08:53:08 +0530
committerKrutika Dhananjay <kdhananj@redhat.com>2019-10-09 06:35:43 +0000
commit47dbd753187f69b3835d2e42fdbe7485874c4b3e (patch)
tree25bf92a6e5b01490b9942f919a2979d59469e389 /xlators/cluster/afr
parent41752a2f78a3a69fb8e3359906b7132457ca9acc (diff)
afr: support split-brain CLI for replica 3
Ever since we added quorum checks for lookups in afr via commit bd44d59741bb8c0f5d7a62c5b1094179dd0ce8a4, the split-brain resolution commands would not work for replica 3 because there would be no readables for the lookup fop. The argument was that split-brains do not occur in replica 3 but we do see (data/metadata) split-brain cases once in a while which indicate that there are a few bugs/corner cases yet to be discovered and fixed. Fortunately, commit 8016d51a3bbd410b0b927ed66be50a09574b7982 added GF_CLIENT_PID_GLFS_HEALD as the pid for all fops made by glfsheal. If we leverage this and allow lookups in afr when pid is GF_CLIENT_PID_GLFS_HEALD, split-brain resolution commands will work for replica 3 volumes too. Likewise, the check is added in shard_lookup as well to permit resolving split-brains by specifying "/.shard/shard-file.xx" as the file name (which previously used to fail with EPERM). Change-Id: I3c543dea79caf7cfbc1633e9089cb1cdd2538ba9 Fixes: bz#1756938 Signed-off-by: Ravishankar N <ravishankar@redhat.com>
Diffstat (limited to 'xlators/cluster/afr')
-rw-r--r--xlators/cluster/afr/src/afr-common.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/xlators/cluster/afr/src/afr-common.c b/xlators/cluster/afr/src/afr-common.c
index b9cd688..951d8e7 100644
--- a/xlators/cluster/afr/src/afr-common.c
+++ b/xlators/cluster/afr/src/afr-common.c
@@ -2293,7 +2293,8 @@ afr_attempt_readsubvol_set(call_frame_t *frame, xlator_t *this,
if ((spb_choice >= 0) &&
(AFR_COUNT(success_replies, child_count) == child_count)) {
*read_subvol = spb_choice;
- } else if (!priv->quorum_count) {
+ } else if (!priv->quorum_count ||
+ frame->root->pid == GF_CLIENT_PID_GLFS_HEAL) {
*read_subvol = afr_first_up_child(frame, this);
} else if (priv->quorum_count &&
afr_has_quorum(data_readable, this, NULL)) {