Aravinda Vishwanathapura Krishna Murthy
2019-Oct-17 15:33 UTC
[Gluster-users] Single Point of failure in geo Replication
On Thu, Oct 17, 2019 at 11:44 AM deepu srinivasan <sdeepugd at gmail.com> wrote:> Thank you for your response. > We have tried the above use case you mentioned. > > Case 1: Primary node is permanently Down (Hardware failure) > In this case, the Georeplication session cannot be stopped and returns the > failure "start the primary node and then stop(or similar message)". > Now I cannot delete because I cannot stop the session. >Please try "stop force", Let us know if that works.> On Thu, Oct 17, 2019 at 8:32 AM Aravinda Vishwanathapura Krishna Murthy < > avishwan at redhat.com> wrote: > >> >> On Wed, Oct 16, 2019 at 11:08 PM deepu srinivasan <sdeepugd at gmail.com> >> wrote: >> >>> Hi Users >>> Is there a single point of failure in GeoReplication for gluster? >>> My Case: >>> I Use 3 nodes in both master and slave volume. >>> Master volume : Node1,Node2,Node3 >>> Slave Volume : Node4,Node5,Node6 >>> I tried to recreate the scenario to test a single point of failure. >>> >>> Geo-Replication Status: >>> >>> *Master Node Slave Node Status * >>> Node1 Node4 Active >>> Node2 Node4 Passive >>> Node3 Node4 Passive >>> >>> Step 1: Stoped the glusterd daemon in Node4. >>> Result: There were only two-node statuses like the one below. >>> >>> *Master Node Slave Node Status * >>> Node2 Node4 Passive >>> Node3 Node4 Passive >>> >>> >>> Will the GeoReplication session goes down if the primary slave is down? >>> >> >> >> Hi Deepu, >> >> Geo-replication depends on a primary slave node to get the information >> about other nodes which are part of Slave Volume. >> >> Once the workers are started, it is not dependent on the primary slave >> node. Will not fail if a primary goes down. But if any other node goes down >> then the worker will try to connect to some other node, for which it tries >> to run Volume status command on the slave node using the following command. >> >> ``` >> ssh -i <georep-pem> <primary-node> gluster volume status <slavevol> >> ``` >> >> The above command will fail and Worker will not get the list of Slave >> nodes to which it can connect to. >> >> This is only a temporary failure until the primary node comes back >> online. If the primary node is permanently down then run Geo-rep delete and >> Geo-rep create command again with the new primary node. (Note: Geo-rep >> Delete and Create will remember the last sync time and resume once it >> starts) >> >> I will evaluate the possibility of caching a list of Slave nodes so that >> it can be used as a backup primary node in case of failures. I will open >> Github issue for the same. >> >> Thanks for reporting the issue. >> >> -- >> regards >> Aravinda VK >> >-- regards Aravinda VK -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.gluster.org/pipermail/gluster-users/attachments/20191017/fe2a180f/attachment.html>