Apache druid No known server

Question

I am trying to setup the Apache Druid on a single machine following quickstart guide here. When I start historical server, it shows io.druid.java.util.common.IOE: No known server exception on screen.

Command:

java `cat conf-quickstart/druid/historical/jvm.config xargs` \
-cp "conf-quickstart/druid/_common:conf-quickstart/druid/historical:lib/*" \
io.druid.cli.Main server historical

Full stack-trace-

2018-04-07T18:23:40,234 WARN [main] io.druid.java.util.common.RetryUtils - Failed on try 1, retrying in 1,246ms. io.druid.java.util.common.IOE: No known server at io.druid.discovery.DruidLeaderClient.getCurrentKnownLeader(DruidLeaderClient.java:276) ~[druid-server-0.12.0.jar:0.12.0] at io.druid.discovery.DruidLeaderClient.makeRequest(DruidLeaderClient.java:128) ~[druid-server-0.12.0.jar:0.12.0] at io.druid.query.lookup.LookupReferencesManager.fetchLookupsForTier(LookupReferencesManager.java:569) ~[druid-server-0.12.0.jar:0.12.0] at io.druid.query.lookup.LookupReferencesManager.tryGetLookupListFromCoordinator(LookupReferencesManager.java:420) ~[druid-server-0.12.0.jar:0.12.0] at io.druid.query.lookup.LookupReferencesManager.lambda$getLookupListFromCoordinator$4(LookupReferencesManager.java:398) ~[druid-server-0.12.0.jar:0.12.0] at io.druid.java.util.common.RetryUtils.retry(RetryUtils.java:63) [java-util-0.12.0.jar:0.12.0] at io.druid.java.util.common.RetryUtils.retry(RetryUtils.java:81) [java-util-0.12.0.jar:0.12.0] at io.druid.query.lookup.LookupReferencesManager.getLookupListFromCoordinator(LookupReferencesManager.java:388) [druid-server-0.12.0.jar:0.12.0]

I have tried to setup from scratch many times with exactly the same steps mentioned on quick-start guide, but I am unable to resolve this error. How to resolve this error?

I think you need to first start coordinator, overload and zookeeper before you start data server (historical) — mdeora, May 11 '18 at 12:04
Don't worry about the error. Start all the 5 services that would solve this issue. — Nikhil Baby, Jun 27 '18 at 11:27

soote · Answer 1 · 2018-06-06T19:45:59.160

If you already tried to start druid, then delete the druid-X.Y.Z/log and druid-X.Y.Z/var folders.

Start zookeeper ./zookeeper-X.Y.Z/bin/zkServer.sh start
Recreate those folders you erased with druid-X.Y.Z/bin/init

Run each command in a new tab in this order

java `cat conf-quickstart/druid/coordinator/jvm.config | xargs` -cp "conf-quickstart/druid/_common:conf-quickstart/druid/coordinator:lib/*" io.druid.cli.Main server coordinator
java `cat conf-quickstart/druid/overlord/jvm.config | xargs` -cp "conf-quickstart/druid/_common:conf-quickstart/druid/overlord:lib/*" io.druid.cli.Main server overlord
java `cat conf-quickstart/druid/broker/jvm.config | xargs` -cp "conf-quickstart/druid/_common:conf-quickstart/druid/broker:lib/*" io.druid.cli.Main server broker
java `cat conf-quickstart/druid/historical/jvm.config | xargs` -cp "conf-quickstart/druid/_common:conf-quickstart/druid/historical:lib/*" io.druid.cli.Main server historical
java `cat conf-quickstart/druid/middleManager/jvm.config | xargs` -cp "conf-quickstart/druid/_common:conf-quickstart/druid/middleManager:lib/*" io.druid.cli.Main server middleManager

You should now have 1 tab open for each of those commands (so 5).

Insert the data curl -X 'POST' -H 'Content-Type:application/json' -d @quickstart/wikiticker-index.json localhost:8090/druid/indexer/v1/task

You will then see {"task":"index_hadoop_wikiticker_2018-06-06T19:17:51.900Z"}

Apache druid No known server

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