path: root/xlators/mgmt/glusterd/src/glusterd-volgen.c
diff options
authorMohit Agrawal <>2018-09-29 13:15:35 +0530
committerMOHIT AGRAWAL <>2020-02-09 12:42:56 +0000
commit6de80bcd6366778ac34ce58ec496fa08cc02bd0b (patch)
tree69d591b8949841ae7b891fd4d1dadd62c4202600 /xlators/mgmt/glusterd/src/glusterd-volgen.c
parentf1e62e1578ee07802827121722d90c1ec4b811a6 (diff)
feature/changelog: Avoid thread creation if xlator is not enabled
Problem: Changelog creates threads even if the changelog is not enabled Background: Changelog xlator broadly does two things 1. Journalling - Cosumers are geo-rep and glusterfind 2. Event Notification for registered events like (open, release etc) - Consumers are bitrot, geo-rep The existing option "changelog.changelog" controls journalling and there is no option to control event notification and is enabled by default. So when bitrot/geo-rep is not enabled on the volume, threads and resources(rpc and rbuf) related to event notifications consumes resources and cpu cycle which is unnecessary. Solution: The solution is to have two different options as below. 1. changelog-notification : Event notifications 2. changelog : Journalling This patch introduces the option "changelog-notification" which is not exposed to user. When either bitrot or changelog (journalling) is enabled, it internally enbales 'changelog-notification'. But once the 'changelog-notification' is enabled, it will not be disabled for the life time of the brick process even after bitrot and changelog is disabled. As of now, rpc resource cleanup has lot of races and is difficult to cleanup cleanly. If allowed, it leads to memory leaks and crashes on enable/disable of bitrot or changelog (journal) in a loop. Hence to be safer, the event notification is not disabled within lifetime of process once enabled. Change-Id: Ifd00286e0966049e8eb9f21567fe407cf11bb02a Updates: #475 Signed-off-by: Mohit Agrawal <>
Diffstat (limited to 'xlators/mgmt/glusterd/src/glusterd-volgen.c')
1 files changed, 13 insertions, 0 deletions
diff --git a/xlators/mgmt/glusterd/src/glusterd-volgen.c b/xlators/mgmt/glusterd/src/glusterd-volgen.c
index aea25b1..59287ee 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volgen.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volgen.c
@@ -1842,6 +1842,19 @@ brick_graph_add_changelog(volgen_graph_t *graph, glusterd_volinfo_t *volinfo,
ret = xlator_set_fixed_option(xl, "changelog-dir", changelog_basepath);
if (ret)
goto out;
+ ret = glusterd_is_bitrot_enabled(volinfo);
+ if (ret == -1) {
+ goto out;
+ } else if (ret) {
+ ret = xlator_set_fixed_option(xl, "changelog-notification", "on");
+ if (ret)
+ goto out;
+ } else {
+ ret = xlator_set_fixed_option(xl, "changelog-notification", "off");
+ if (ret)
+ goto out;
+ }
return ret;