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HBase, Zookeeper and Solr

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If Solr and HBase are not on the same machine (distributed architecture), you will probably face this ZK problem:

[WARN ][15:14:42,409][host:2181)] org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection refused
 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
 at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
 at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
 at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)

java.io.IOException: Failed to connect with Zookeeper within timeout 30000, 
connection string: localhost:2181
 at com.ngdata.hbaseindexer.util.zookeeper.StateWatchingZooKeeper.<init>(StateWatchingZooKeeper.java:109)
 at com.ngdata.hbaseindexer.util.zookeeper.StateWatchingZooKeeper.<init>(StateWatchingZooKeeper.java:73)
 at com.ngdata.hbaseindexer.cli.BaseIndexCli.connectWithZooKeeper(BaseIndexCli.java:92)
 at com.ngdata.hbaseindexer.cli.BaseIndexCli.run(BaseIndexCli.java:79)
 at com.ngdata.hbaseindexer.cli.AddIndexerCli.run(AddIndexerCli.java:50)
 at com.ngdata.hbaseindexer.cli.BaseCli.run(BaseCli.java:69)
 at com.ngdata.hbaseindexer.cli.AddIndexerCli.main(AddIndexerCli.java:30)

Notice here that HBase-indexer is trying to reach the localhost server of Zookeeper.
Do not to forget –zookeeper param in distributed HBase-Indexer setup:
/opt/lucidworks-hdpsearch/hbase-indexer/bin/hbase-indexer add-indexer -n hbaseindexer -c /opt/lucidworks-hdpsearch/hbase-indexer/indexdemo-indexer.xml -cp solr.zk=hmaster:2181 -cp solr.collection=hbaseCollection –zookeeper hmaster:2181

Actually, I’ve been facing this error because I thought that the “-cp solr.zk” parameter was sufficient. But If you look in depth to the commands documentation, you will see that you have to mention the zookeepers twice.

 

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Author: Salem Ben Afia

Big Data & Java developer Search Engine Architect, Lucene Expert

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