topic Re: Why is my search head cluster captain logging KV Store replication errors? in Deployment Architecture

Why is my search head cluster captain logging KV Store replication errors?

twinspop — Fri, 27 Oct 2017 20:48:30 GMT

The log is repeating at sub-second intervals:

2017-10-27T20:44:53.389Z I REPL [ReplicationExecutor] Error in heartbeat request to shccaptain:8191; InvalidReplicaSetConfig Our replica set configuration is invalid or does not include us

The kvstore appears to be healthy otherwise.

> curl -sku admin:password https://shcmember:8089/services/server/info | grep -i kv <s:key name="kvStoreStatus">ready</s:key>

> curl -sku admin:password https://shccaptain:8089/services/server/info | grep -i kv <s:key name="kvStoreStatus">ready</s:key>

What's the problem? What's the fix?

EDIT: The error started after creating a collection by running this curl command:

curl -ku admin -d name=userid https://shcmember:8089/servicesNS/nobody/alpha_search/storage/collections/config

Re: Why is my search head cluster captain logging KV Store replication errors?

kamlesh_vaghela — Sun, 29 Oct 2017 10:39:08 GMT

HI
can you share collection configuration?

Re: Why is my search head cluster captain logging KV Store replication errors?

twinspop — Mon, 30 Oct 2017 00:48:50 GMT

The collection was configured as above. No other settings applied. These are the defaults as far as I can tell:

[userid] profilingEnabled = false profilingThresholdMs = 1000 replicate = false replication_dump_maximum_file_size = 10240 replication_dump_strategy = auto type = undefined

Re: Why is my search head cluster captain logging KV Store replication errors?

kamlesh_vaghela — Mon, 30 Oct 2017 05:27:25 GMT

Can you please try below stanza?

[userid] 
replicate = true
enforceTypes = false

I have removed other configuration bcoz those have assigned to default values. Make sure about configuration would same in entire cluster.

Thanks

Re: Why is my search head cluster captain logging KV Store replication errors?

twinspop — Mon, 30 Oct 2017 15:50:29 GMT

I should say that i have many other collections running, with exactly the same creation procedure. None triggered this error repeating. That said, I added the configs you suggested above to this single collection via the REST API. Confirmed via btool. The errors continue.

Re: Why is my search head cluster captain logging KV Store replication errors?

twinspop — Wed, 08 Nov 2017 03:14:40 GMT

Splunk Support provided this solution:

on the SHC captain, splunk stop, then splunk clean kvstore --local, accept the scary warning message, and finally restart splunk. The errors have subsided and as far as I can tell, no damage was done.

Hope this helps a future admin.

Re: Why is my search head cluster captain logging KV Store replication errors?

delink — Thu, 31 Jan 2019 12:57:59 GMT

A slightly safer way to do this is just transfer the captaincy to another member of the cluster so that it rebuilds the replicaSet configuration for mongod. No stops or cleans required.

https://docs.splunk.com/Documentation/Splunk/latest/DistSearch/Transfercaptain#Change_the_captain

Re: Why is my search head cluster captain logging KV Store replication errors?

peter_krammer — Tue, 28 May 2019 17:05:54 GMT

Thanks!
Has the same problem today and changing the captain did not help.
But running this on the problematic host, solved it.