通过Spark访问HBase表

Question

我使用此代码示例http://www.vidyasource.com/blog/Programming/Scala/Java/Data/Hadoop/Analytics/2014/01/25/lighting-a-spark-with-hbase使用Spark读取hbase表，只通过代码添加hbase.zookeeper.quorum，因为它不是从hbase-site.xml中选择它。

星火1.5.3 的HBase 0.98.0

我面对这个错误 -

java.lang.IllegalAccessError: com/google/protobuf/HBaseZeroCopyByteString 
at org.apache.hadoop.hbase.protobuf.RequestConverter.buildRegionSpecifier(RequestConverter.java:921) 
at org.apache.hadoop.hbase.protobuf.RequestConverter.buildGetRowOrBeforeRequest(RequestConverter.java:132) 
at org.apache.hadoop.hbase.protobuf.ProtobufUtil.getRowOrBefore(ProtobufUtil.java:1520) 
at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegionInMeta(ConnectionManager.java:1294) 
at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1128) 
at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1111) 
at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1070) 
at org.apache.hadoop.hbase.client.HTable.finishSetup(HTable.java:347) 
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:201) 
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:159) 
at test.MyHBase.getTable(MyHBase.scala:33) 
at test.MyHBase.<init>(MyHBase.scala:11) 
at $line43.$read$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw.fetch(<console>:30) 
at $line44.$read$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$anonfun$1.apply(<console>:49) 
at $line44.$read$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$anonfun$1.apply(<console>:49) 
at scala.collection.Iterator$$anon$11.next(Iterator.scala:370) 
at scala.collection.Iterator$class.foreach(Iterator.scala:742) 
at scala.collection.AbstractIterator.foreach(Iterator.scala:1194) 
at scala.collection.generic.Growable$class.$plus$plus$eq(Growable.scala:59) 
at scala.collection.mutable.ArrayBuffer.$plus$plus$eq(ArrayBuffer.scala:104) 
at scala.collection.mutable.ArrayBuffer.$plus$plus$eq(ArrayBuffer.scala:48) 
at scala.collection.TraversableOnce$class.to(TraversableOnce.scala:308) 
at scala.collection.AbstractIterator.to(Iterator.scala:1194) 
at scala.collection.TraversableOnce$class.toBuffer(TraversableOnce.scala:300) 
at scala.collection.AbstractIterator.toBuffer(Iterator.scala:1194) 
at scala.collection.TraversableOnce$class.toArray(TraversableOnce.scala:287) 
at scala.collection.AbstractIterator.toArray(Iterator.scala:1194) 
at org.apache.spark.rdd.RDD$$anonfun$collect$1$$anonfun$12.apply(RDD.scala:905) 
at org.apache.spark.rdd.RDD$$anonfun$collect$1$$anonfun$12.apply(RDD.scala:905) 
at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1848) 
at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1848) 
at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:66) 
at org.apache.spark.scheduler.Task.run(Task.scala:88) 
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:214) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
at java.lang.Thread.run(Thread.java:745) 

Answer 1

这是跟踪并固定在HBASE-10304的HBase的问题。问题是HBaseZeroCopyByteString类声明在Protobuf库中，但它在不同的jar文件中。最后，一个不同的类加载器加载它并找不到超类声明。它在HBase 0.99中是固定的。

我认为一个解决方法可能是确保包含您向Spark提交的罐子包含com.google.protobuf.LiteralByteString和com.google.protobuf.HBaseZeroCopyByteString的罐子。

最后你应该升级。你能想象从0.98开始已经修复的错误列表吗？你打算全部击中他们并逐一解决他们吗？