diff options
| author | Ravishankar N <ravishankar@redhat.com> | 2016-10-14 16:09:08 +0530 |
|---|---|---|
| committer | Pranith Kumar Karampuri <pkarampu@redhat.com> | 2016-10-15 09:26:08 -0700 |
| commit | a1ee61051c6d284b9e632b975227c07cb4dda93d (patch) | |
| tree | 6a3a84838efc0c52a91aa44f97800fe6f2cab014 /xlators | |
| parent | 00e5c6399d71cee737388166a4c838718132ff93 (diff) | |
afr: Take full locks in arbiter only for data transactions
Problem:
Sharding exposed a bug in arbiter config. where `dd` throughput was
extremely slow. Shard xlator was sending a fxattrop to update the file
size immediately after a writev. Arbiter was incorrectly over-riding the
LLONGMAX-1 start offset (for metadata domain locks) for this fxattrop,
causing the inodelk to be taken on the data domain. And since the
preceeding writev hadn't released the lock (afr does a 'lazy'
unlock if write succeeds on all bricks), this degraded to a blocking
lock causing extra lock/unlock calls and delays.
Fix:
Modify flock.l_len and flock.l_start to take full locks only for data
transactions.
> Reviewed-on: http://review.gluster.org/15641
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
(cherry picked from commit 3a97486d7f9d0db51abcb13dcd3bc9db935e3a60)
Change-Id: I906895da2f2d16813607e6c906cb4defb21d7c3b
BUG: 1375125
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
Reported-by: Max Raba <max.raba@comsysto.com>
Reviewed-on: http://review.gluster.org/15647
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
Diffstat (limited to 'xlators')
| -rw-r--r-- | xlators/cluster/afr/src/afr-transaction.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/xlators/cluster/afr/src/afr-transaction.c b/xlators/cluster/afr/src/afr-transaction.c index fae65d9d9a7..5733cc1c1ca 100644 --- a/xlators/cluster/afr/src/afr-transaction.c +++ b/xlators/cluster/afr/src/afr-transaction.c @@ -1564,7 +1564,8 @@ afr_set_transaction_flock (xlator_t *this, afr_local_t *local) inodelk = afr_get_inodelk (int_lock, int_lock->domain); priv = this->private; - if (priv->arbiter_count) { + if (priv->arbiter_count && + local->transaction.type == AFR_DATA_TRANSACTION) { /*Lock entire file to avoid network split brains.*/ inodelk->flock.l_len = 0; inodelk->flock.l_start = 0; |