Testing java HBase connection

Question

I am trying to use the HBase Java APIs to write data into HBase. I installed Hadoop/HBase through Ambari.

Here is how the configuration is currently set up:

final Configuration CONFIGURATION = HBaseConfiguration.create();
final HBaseAdmin HBASE_ADMIN;

HBASE_ADMIN = new HBaseAdmin(CONFIGURATION)

When I try to write to HBase, I check to make sure that the table exists

!HBASE_ADMIN.tableExists(tableName)

If not, create a new one. However, it appears that when attempting to check if the table exists exceptions are being thrown.

I'm wondering if I'm not correctly connected to HBase...is there any good way to verify that the configuration is correct and that I am connecting to HBase? The exception I'm getting is below.

Thanks.

---

java.lang.RuntimeException: java.lang.NullPointerException
  at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:209)
  at org.apache.hadoop.hbase.client.ClientScanner.call(ClientScanner.java:288)
  at org.apache.hadoop.hbase.client.ClientScanner.nextScanner(ClientScanner.java:268)
  at org.apache.hadoop.hbase.client.ClientScanner.initializeScannerInConstruction(ClientScanner.java:140)
  at org.apache.hadoop.hbase.client.ClientScanner.<init>(ClientScanner.java:135)
  at org.apache.hadoop.hbase.catalog.MetaReader.fullScan(MetaReader.java:597)
  at org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:802)
  at org.apache.hadoop.hbase.catalog.MetaReader.tableExists(MetaReader.java:359)
  at org.apache.hadoop.hbase.client.HBaseAdmin.tableExists(HBaseAdmin.java:287)
  at org.apache.hadoop.hbase.client.HBaseAdmin.tableExists(HBaseAdmin.java:301)
  at com.business.project.hbase.HBaseMessageWriter.getTable(HBaseMessageWriter.java:40)
  at com.business.project.hbase.HBaseMessageWriter.write(HBaseMessageWriter.java:59)
  at com.business.project.hbase.HBaseMessageWriter.write(HBaseMessageWriter.java:54)
  at com.business.project.storm.bolt.package.exampleBolt.execute(exampleBolt.java:19)
  at backtype.storm.daemon.executor$fn__5697$tuple_action_fn__5699.invoke(executor.clj:659)
  at backtype.storm.daemon.executor$mk_task_receiver$fn__5620.invoke(executor.clj:415)
  at backtype.storm.disruptor$clojure_handler$reify__1741.onEvent(disruptor.clj:58)
  at backtype.storm.utils.DisruptorQueue.consumeBatchToCursor(DisruptorQueue.java:125)
  at backtype.storm.utils.DisruptorQueue.consumeBatchWhenAvailable(DisruptorQueue.java:99)
  at backtype.storm.disruptor$consume_batch_when_available.invoke(disruptor.clj:80)
  at backtype.storm.daemon.executor$fn__5697$fn__5710$fn__5761.invoke(executor.clj:794)
  at backtype.storm.util$async_loop$fn__452.invoke(util.clj:465)
  at clojure.lang.AFn.run(AFn.java:24)
  at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
  at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.getMetaReplicaNodes(ZooKeeperWatcher.java:269)
  at org.apache.hadoop.hbase.zookeeper.MetaRegionTracker.blockUntilAvailable(MetaRegionTracker.java:241)
  at org.apache.hadoop.hbase.client.ZooKeeperRegistry.getMetaRegionLocation(ZooKeeperRegistry.java:62)
  at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateMeta(ConnectionManager.java:1203)
  at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1164)
  at org.apache.hadoop.hbase.client.RpcRetryingCallerWithReadReplicas.getRegionLocations(RpcRetryingCallerWithReadReplicas.java:294)
  at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:130)
  at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:55)
  at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:201)

Answer 1

In addition to the configuration parameters suggested by Yosr, specifying

conf.set("zookeeper.znode.parent", "VALUE")

would help resolve the issue.