Hbase版本&＃xff1a;Hortonworks Hbase 1.1.2
问题描述&＃xff1a;
使用Scala操作Hbase时&＃xff0c;发生空指针异常&＃xff08;java.lang.RuntimeException: java.lang.NullPointerException&＃xff09;&＃xff0c;异常如下&＃xff1a;
18/09/13 20:28:51 ERROR Executor: Exception in task 1.0 in stage 361.0 (TID 18925)
java.lang.RuntimeException: java.lang.NullPointerException
at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:208)
at org.apache.hadoop.hbase.client.ClientSmallReversedScanner.loadCache(ClientSmallReversedScanner.java:211)
at org.apache.hadoop.hbase.client.ClientSmallReversedScanner.next(ClientSmallReversedScanner.java:185)
at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegionInMeta(ConnectionManager.java:1255)
at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1161)
at org.apache.hadoop.hbase.client.AsyncProcess.submit(AsyncProcess.java:370)
at org.apache.hadoop.hbase.client.AsyncProcess.submit(AsyncProcess.java:321)
at org.apache.hadoop.hbase.client.BufferedMutatorImpl.backgroundFlushCommits(BufferedMutatorImpl.java:206)
at org.apache.hadoop.hbase.client.BufferedMutatorImpl.flush(BufferedMutatorImpl.java:183)
at org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:1449)
at org.apache.hadoop.hbase.client.HTable.put(HTable.java:1052)
at scala.OperateMysqlTable$$anonfun$main$1$$anonfun$apply$3$$anonfun$apply$4.apply(AccompanyAnalyze.scala:177)
at scala.OperateMysqlTable$$anonfun$main$1$$anonfun$apply$3$$anonfun$apply$4.apply(AccompanyAnalyze.scala:161)
at org.apache.spark.rdd.RDD$$anonfun$foreachPartition$1$$anonfun$apply$29.apply(RDD.scala:926)
at org.apache.spark.rdd.RDD$$anonfun$foreachPartition$1$$anonfun$apply$29.apply(RDD.scala:926)
at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1954)
at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1954)
at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
at org.apache.spark.scheduler.Task.run(Task.scala:99)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:325)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.getMetaReplicaNodes(ZooKeeperWatcher.java:399)
at org.apache.hadoop.hbase.zookeeper.MetaTableLocator.blockUntilAvailable(MetaTableLocator.java:552)
at org.apache.hadoop.hbase.client.ZooKeeperRegistry.getMetaRegionLocation(ZooKeeperRegistry.java:61)
at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateMeta(ConnectionManager.java:1191)
at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1158)
at org.apache.hadoop.hbase.client.RpcRetryingCallerWithReadReplicas.getRegionLocations(RpcRetryingCallerWithReadReplicas.java:300)
at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:151)
at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:59)
at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:200)
... 22 more
问题分析&＃xff1a;
该异常为客户端去zookeeper获取Hbase相关信息时&＃xff0c;没有找到&＃xff0c;抛出空指针异常
问题原因&＃xff1a;
不同发行商的hbase的在zookeeper的znode设置不同
Hortonworks的hbase在zookeeper中znode路径为/hbase-unsecure
查看该路径下hbase的相关信息
[zk: localhost:2181(CONNECTED) 1] ls /hbase-unsecure
[replication, meta-region-server, rs, splitWAL, backup-masters, table-lock, flush-table-proc, master-maintenance, region-in-transition, online-snapshot, acl, switch, master, running, recovering-regions, draining, namespace, hbaseid, table]
解决办法&＃xff1a;
我使用的是Hortonworks的Hbase&＃xff0c;所以要在Hbase的conf中添加如下配置信息
conf.set("zookeeper.znode.parent", "/hbase-unsecure")
如果是Cloudera的Hbase&＃xff0c;添加配置信息如下&＃xff1a;
conf.set("zookeeper.znode.parent", "/hbase")
添加后&＃xff0c;重新执行程序&＃xff0c;Hbase表创建成功&＃xff0c;问题解决
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