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From Huiliang Zhang <zhl...@gmail.com>
Subject NullPointerException when scanning HBase table
Date Tue, 01 May 2018 02:05:02 GMT
Hi,

In my spark job, I need to scan HBase table. I set up a scan with custom
filters. Then I use

newAPIHadoopRDD function to get a JavaPairRDD variable X.

The problem is when no records inside HBase matches my filters,
the call X.isEmpty() or X.count() will cause a java.lang.NullPointerException.

Part of trace is here:
Caused by: java.lang.RuntimeException: java.lang.NullPointerException
	at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:208)
	at org.apache.hadoop.hbase.client.ClientScanner.call(ClientScanner.java:320)
	at org.apache.hadoop.hbase.client.ClientScanner.nextScanner(ClientScanner.java:295)
	at org.apache.hadoop.hbase.client.ClientScanner.initializeScannerInConstruction(ClientScanner.java:160)
	at org.apache.hadoop.hbase.client.ClientScanner.<init>(ClientScanner.java:155)
	at org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:821)
	at org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:193)
	at org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:89)
	at org.apache.hadoop.hbase.client.MetaScanner.allTableRegions(MetaScanner.java:324)
	at org.apache.hadoop.hbase.client.HRegionLocator.getAllRegionLocations(HRegionLocator.java:88)
	at org.apache.hadoop.hbase.util.RegionSizeCalculator.init(RegionSizeCalculator.java:94)
	at org.apache.hadoop.hbase.util.RegionSizeCalculator.<init>(RegionSizeCalculator.java:81)
	at org.apache.hadoop.hbase.mapreduce.TableInputFormatBase.getSplits(TableInputFormatBase.java:256)
	at org.apache.spark.rdd.NewHadoopRDD.getPartitions(NewHadoopRDD.scala:125)
	at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:252)
	at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:250)
	at scala.Option.getOrElse(Option.scala:121)
	at org.apache.spark.rdd.RDD.partitions(RDD.scala:250)
	at org.apache.spark.rdd.RDD$$anonfun$isEmpty$1.apply$mcZ$sp(RDD.scala:1461)
	at org.apache.spark.rdd.RDD$$anonfun$isEmpty$1.apply(RDD.scala:1461)
	at org.apache.spark.rdd.RDD$$anonfun$isEmpty$1.apply(RDD.scala:1461)
	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151)
	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112)
	at org.apache.spark.rdd.RDD.withScope(RDD.scala:362)
	at org.apache.spark.rdd.RDD.isEmpty(RDD.scala:1460)
	at org.apache.spark.api.java.JavaRDDLike$class.isEmpty(JavaRDDLike.scala:544)
	at org.apache.spark.api.java.AbstractJavaRDDLike.isEmpty(JavaRDDLike.scala:45)
...


I just override setConf() function to setSacn().

Please see if this is a bug of spark or issue of my code.

Thanks,

Huiliang

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