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authorRichard Wareing <rwareing@fb.com>2015-06-23 17:03:11 -0700
committerVijay Bellur <vbellur@redhat.com>2015-11-01 09:14:34 -0800
commitd3e496cbcd35b9d9b840e328ae109c44f59083ce (patch)
tree25eedba238f9168cd11015885973d5a960c1596e /xlators/mgmt/glusterd/src
parent846697d91ed56ca3d76f2a78e87e7675f127f21d (diff)
debug/io-stats: Add FOP sampling feature
Summary: - Using sampling feature you can record details about every Nth FOP. The fields in each sample are: FOP type, hostname, uid, gid, FOP priority, port and time taken (latency) to fufill the request. - Implemented using a ring buffer which is not (m/c) allocated in the IO path, this should make the sampling process pretty cheap. - DNS resolution done @ dump time not @ sample time for performance w/ cache - Metrics can be used for both diagnostics, traffic/IO profiling as well as P95/P99 calculations - To control this feature there are two new volume options: diagnostics.fop-sample-interval - The sampling interval, e.g. 1 means sample every FOP, 100 means sample every 100th FOP diagnostics.fop-sample-buf-size - The size (in bytes) of the ring buffer used to store the samples. In the even more samples are collected in the stats dump interval than can be held in this buffer, the oldest samples shall be discarded. Samples are stored in the log directory under /var/log/glusterfs/samples. - Uses DNS cache written by sshreyas@fb.com (Thank-you!), the DNS cache TTL is controlled by the diagnostics.stats-dnscache-ttl-sec option and defaults to 24hrs. Test Plan: - Valgrind'd to ensure it's leak free - Run prove test(s) - Shadow testing on 100+ brick cluster Change-Id: I9ee14c2fa18486b7efb38e59f70687249d3f96d8 BUG: 1271310 Signed-off-by: Jeff Darcy <jdarcy@redhat.com> Reviewed-on: http://review.gluster.org/12210 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Diffstat (limited to 'xlators/mgmt/glusterd/src')
-rw-r--r--xlators/mgmt/glusterd/src/glusterd-volume-set.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/xlators/mgmt/glusterd/src/glusterd-volume-set.c b/xlators/mgmt/glusterd/src/glusterd-volume-set.c
index 4ea7d3b..ccf4b38 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volume-set.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volume-set.c
@@ -849,6 +849,21 @@ struct volopt_map_entry glusterd_volopt_map[] = {
.option = "ios-dump-interval",
.op_version = 1
},
+ { .key = "diagnostics.fop-sample-interval",
+ .voltype = "debug/io-stats",
+ .option = "ios-sample-interval",
+ .op_version = 1
+ },
+ { .key = "diagnostics.fop-sample-buf-size",
+ .voltype = "debug/io-stats",
+ .option = "ios-sample-buf-size",
+ .op_version = 1
+ },
+ { .key = "diagnostics.stats-dnscache-ttl-sec",
+ .voltype = "debug/io-stats",
+ .option = "ios-dnscache-ttl-sec",
+ .op_version = 1
+ },
/* IO-cache xlator options */
{ .key = "performance.cache-max-file-size",