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authorShyam <srangana@redhat.com>2015-05-15 15:50:42 -0400
committerRaghavendra G <rgowdapp@redhat.com>2015-06-02 03:03:07 -0700
commit9f29401791ad374015c3d0927b7cf967d66471a6 (patch)
tree524c29d32133d89056704f02539ae3a5e56ad71f /xlators/cluster
parent2df57ab7dc7b9d7deb0eebad96036149760d607b (diff)
dht: Add lookup-optimize configuration option for DHT
Currently with commit 4eaaf5 a mixed version cluster would have issues if lookup-uhashed is set to auto, as older clients would fail to validate the layouts if newer clients (i.e 3.7 or upwards) create directories. Also, in a mixed version cluster rebalance daemon would set commit hash for some subvolumes and not for the others. This commit fixes this problem by moving the enabling of the functionality introduced in the above mentioned commit to a new dht option. This option also has a op_version of 3_7_1 thereby preventing it from being set in a mixed version cluster. It brings in the following changes, - Option can be set only if min version of the cluster is 3.7.1 or more - Rebalance and mkdir update the layout with the commit hashes only if this option is set, hence ensuring rebalance works in a mixed version cluster, and also directories created by newer clients do not cause layout errors when read by older clients - This option also supersedes lookup-unhased, to enable the optimization for lookups more deterministic and not conflict with lookup-unhashed settings. Option added is cluster.lookup-optimize, which is a boolean. Usage: # gluster volume set VOLNAME cluster.lookup-optimize on Change-Id: Ifd1d4ce3f6438fcbcd60ffbfdbfb647355ea1ae0 BUG: 1222126 Signed-off-by: Shyam <srangana@redhat.com> Reviewed-on: http://review.gluster.org/10797 Tested-by: NetBSD Build System <jenkins@build.gluster.org> Reviewed-by: Kaushal M <kaushal@redhat.com> Reviewed-by: Raghavendra G <rgowdapp@redhat.com> Tested-by: Raghavendra G <rgowdapp@redhat.com>
Diffstat (limited to 'xlators/cluster')
-rw-r--r--xlators/cluster/dht/src/dht-common.c62
-rw-r--r--xlators/cluster/dht/src/dht-common.h1
-rw-r--r--xlators/cluster/dht/src/dht-rebalance.c6
-rw-r--r--xlators/cluster/dht/src/dht-shared.c13
4 files changed, 66 insertions, 16 deletions
diff --git a/xlators/cluster/dht/src/dht-common.c b/xlators/cluster/dht/src/dht-common.c
index 83aa9a26f4f..545c4796673 100644
--- a/xlators/cluster/dht/src/dht-common.c
+++ b/xlators/cluster/dht/src/dht-common.c
@@ -1920,25 +1920,51 @@ dht_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
"Entry %s missing on subvol %s",
loc->path, prev->this->name);
- if (conf->search_unhashed == GF_DHT_LOOKUP_UNHASHED_ON) {
- local->op_errno = ENOENT;
- dht_lookup_everywhere (frame, this, loc);
- return 0;
- }
- if ((conf->search_unhashed == GF_DHT_LOOKUP_UNHASHED_AUTO) &&
- (loc->parent)) {
+ /* lookup-optimize supercedes lookup-unhashed settings,
+ * - so if it is set, do not process search_unhashed
+ * - except, in the case of rebalance deamon, we want to
+ * force the lookup_everywhere behavior */
+ if (!conf->defrag && conf->lookup_optimize && loc->parent) {
ret = dht_inode_ctx_layout_get (loc->parent, this,
&parent_layout);
- if (ret || !parent_layout)
- goto out;
- if (parent_layout->commit_hash
- != conf->vol_commit_hash) {
- gf_log (this->name, GF_LOG_DEBUG,
- "hashes don't match, do global lookup");
+ if (ret || !parent_layout ||
+ (parent_layout->commit_hash !=
+ conf->vol_commit_hash)) {
+ gf_msg_debug (this->name, 0,
+ "hashes don't match (ret - %d,"
+ " parent_layout - %p, parent_hash - %x,"
+ " vol_hash - %x), do global lookup",
+ ret, parent_layout,
+ (parent_layout ?
+ parent_layout->commit_hash : -1),
+ conf->vol_commit_hash);
+ local->op_errno = ENOENT;
+ dht_lookup_everywhere (frame, this, loc);
+ return 0;
+ }
+ } else {
+ if (conf->search_unhashed ==
+ GF_DHT_LOOKUP_UNHASHED_ON) {
local->op_errno = ENOENT;
dht_lookup_everywhere (frame, this, loc);
return 0;
}
+
+ if ((conf->search_unhashed ==
+ GF_DHT_LOOKUP_UNHASHED_AUTO) &&
+ (loc->parent)) {
+ ret = dht_inode_ctx_layout_get (loc->parent,
+ this,
+ &parent_layout);
+ if (ret || !parent_layout)
+ goto out;
+ if (parent_layout->search_unhashed) {
+ local->op_errno = ENOENT;
+ dht_lookup_everywhere (frame, this,
+ loc);
+ return 0;
+ }
+ }
}
}
@@ -5797,7 +5823,15 @@ dht_mkdir (call_frame_t *frame, xlator_t *this,
goto err;
}
- local->layout->commit_hash = conf->vol_commit_hash;
+ /* set the newly created directory hash to the commit hash
+ * if the configuration option is set. If configuration option
+ * is not set, the older clients may still be connecting to the
+ * volume and hence we need to preserve the 1 in disk[0] part of the
+ * layout xattr */
+ if (conf->lookup_optimize)
+ local->layout->commit_hash = conf->vol_commit_hash;
+ else
+ local->layout->commit_hash = DHT_LAYOUT_HASH_INVALID;
STACK_WIND (frame, dht_mkdir_hashed_cbk,
hashed_subvol,
diff --git a/xlators/cluster/dht/src/dht-common.h b/xlators/cluster/dht/src/dht-common.h
index 96f99141a59..87c0fa55898 100644
--- a/xlators/cluster/dht/src/dht-common.h
+++ b/xlators/cluster/dht/src/dht-common.h
@@ -393,6 +393,7 @@ struct dht_conf {
dht_layout_t **file_layouts;
dht_layout_t **dir_layouts;
gf_boolean_t search_unhashed;
+ gf_boolean_t lookup_optimize;
int gen;
dht_du_t *du_stats;
double min_free_disk;
diff --git a/xlators/cluster/dht/src/dht-rebalance.c b/xlators/cluster/dht/src/dht-rebalance.c
index 92ebd02f995..49e0f879381 100644
--- a/xlators/cluster/dht/src/dht-rebalance.c
+++ b/xlators/cluster/dht/src/dht-rebalance.c
@@ -2357,8 +2357,10 @@ gf_defrag_settle_hash (xlator_t *this, gf_defrag_info_t *defrag,
return -1;
}
- if (conf->local_subvols_cnt == 0) {
- /* Commit hash updates are only done on local subvolumes
+ if (conf->local_subvols_cnt == 0 || !conf->lookup_optimize) {
+ /* Commit hash updates are only done on local subvolumes and
+ * only when lookup optmization is needed (for older client
+ * support)
*/
return 0;
}
diff --git a/xlators/cluster/dht/src/dht-shared.c b/xlators/cluster/dht/src/dht-shared.c
index 8a15fb2a2b9..b8f42fb145b 100644
--- a/xlators/cluster/dht/src/dht-shared.c
+++ b/xlators/cluster/dht/src/dht-shared.c
@@ -426,6 +426,9 @@ dht_reconfigure (xlator_t *this, dict_t *options)
}
}
+ GF_OPTION_RECONF ("lookup-optimize", conf->lookup_optimize, options,
+ bool, out);
+
GF_OPTION_RECONF ("min-free-disk", conf->min_free_disk, options,
percent_or_size, out);
/* option can be any one of percent or bytes */
@@ -662,6 +665,8 @@ dht_init (xlator_t *this)
conf->search_unhashed = GF_DHT_LOOKUP_UNHASHED_AUTO;
}
+ GF_OPTION_INIT ("lookup-optimize", conf->lookup_optimize, bool, err);
+
GF_OPTION_INIT ("unhashed-sticky-bit", conf->unhashed_sticky_bit, bool,
err);
@@ -833,6 +838,14 @@ struct volume_options options[] = {
"from the hash subvolume. If set to OFF, it does not do a lookup "
"on the remaining subvolumes."
},
+ { .key = {"lookup-optimize"},
+ .type = GF_OPTION_TYPE_BOOL,
+ .default_value = "off",
+ .description = "This option if set to ON enables the optimization "
+ "of -ve lookups, by not doing a lookup on non-hashed subvolumes for "
+ "files, in case the hashed subvolume does not return any result. "
+ "This option disregards the lookup-unhashed setting, when enabled."
+ },
{ .key = {"min-free-disk"},
.type = GF_OPTION_TYPE_PERCENT_OR_SIZET,
.default_value = "10%",