通过Spark访问HBase表

Question

我正在使用这个代码示例http://www.vidyasource.com/blog/Programming/Scala/Java/Data/Hadoop/Analytics/2014/01/25/lighting-a-spark-with-hbase来读取hbase使用Spark的表只有通过代码添加hbase.zookeeper.quorum的唯一更改,因为它没有从hbase-site.xml中选择它.

Spark 1.5.3 HBase 0.98.0

我正面临着这个错误 -

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HBASE-10304中跟踪并修复的 HBase 问题。问题是该类HBaseZeroCopyByteString被声明位于 Protobuf 库中，但它位于不同的 jar 文件中。最后，不同的类加载器加载它，但找不到超类声明。它在 HBase 0.99 中已修复。

我认为解决方法可能是确保您在提交给 Spark 的 jar 中包含包含com.google.protobuf.LiteralByteString和 的jar com.google.protobuf.HBaseZeroCopyByteString。

最后你真的应该升级。你能想象自 0.98 以来已修复的 bug 列表吗？你打算把它们全部击倒并一一解决吗？