通過Spark訪問HBase表

Question

我使用此代碼示例http://www.vidyasource.com/blog/Programming/Scala/Java/Data/Hadoop/Analytics/2014/01/25/lighting-a-spark-with-hbase使用Spark讀取hbase表，只通過代碼添加hbase.zookeeper.quorum，因爲它不是從hbase-site.xml中選擇它。

星火1.5.3 的HBase 0.98.0

我面對這個錯誤 -

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

這是跟蹤並固定在HBASE-10304的HBase的問題。問題是HBaseZeroCopyByteString類聲明在Protobuf庫中，但它在不同的jar文件中。最後，一個不同的類加載器加載它並找不到超類聲明。它在HBase 0.99中是固定的。

我認爲一個解決方法可能是確保包含您向Spark提交的罐子包含com.google.protobuf.LiteralByteString和com.google.protobuf.HBaseZeroCopyByteString的罐子。

最後你應該升級。你能想象從0.98開始已經修復的錯誤列表嗎？你打算全部擊中他們並逐一解決他們嗎？