scala - 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使用 Spark 读取 hbase 表，唯一的变化是通过代码添加 hbase.zookeeper.quorum，因为它不是从 hbase-site.xml 中选取它。

星火 1.5.3HBase 0.98.0

我正面临这个错误 -

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

这是在 HBASE-10304 中跟踪和修复的 HBase 问题.问题是 HBaseZeroCopyByteString 类被声明在 Protobuf 库中，但它在不同的 jar 文件中。最后，不同的类加载器加载它，但找不到父类(super class)声明。它已在 HBase 0.99 中修复。

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

到底该不该升级。您能想象自 0.98 以来已修复的错误列表吗？您是否打算一一解决它们并解决它们？