问题描述

在HBase上运行MapReduce作业时，报如下异常：IllegalAccessError: class com.google.protobuf.HBaseZeroCopyByteString cannot access its superclass com.google.protobuf.LiteralByteString

使用HBase环境如下：CDH5.0.1, HBase版本：0.96.1

问题原因

This isssue occurs because of an optimization introduced in HBASE-9867 that inadvertently introduced a classloader dependency. This affects both jobs using the -libjars option and "fat jar," jobs which package their runtime dependencies in a nested lib folder.

这个问题的发生是由于优化了HBASE-9867 引起的，无意间引进了一个依赖类加载器。它影响使用-libjars参数和使用 fat jar两种模式的job.

fat jar模式Hadoop的一个特殊功能：可以读取操作目录中/lib目录下包含的所有库的JAR文件，把运行job依赖的jar放在jar中的lib目录下。

解决方案

1、永久解决方案

cd /opt/cloudera/parcels/CDH-5.0.0-1.cdh5.0.0.p0.47/lib/hadoop

ln -s /opt/cloudera/parcels/CDH-5.0.0-1.cdh5.0.0.p0.47/lib/hbase/lib/hbase-protocol-0.96.1.1-cdh5.0.0.jar hbase-protocol-0.96.1.1-cdh5.0.0.jar

2: 临时解决方案

HADOOP_CLASSPATH=/opt/cloudera/parcels/CDH-5.0.0-1.cdh5.0.0.p0.47/lib/hbase/lib/hbase-protocol-0.96.1.1-cdh5.0.0.jar:/etc/hbase/conf hadoop jar myjar.jar MyJobMainClass

详细报错信息

14/07/16 14:40:50 WARN client.HConnectionManager$HConnectionImplementation: Encountered problems when prefetch hbase:meta table:
org.apache.hadoop.hbase.client.RetriesExhaustedException: Failed after attempts=10, exceptions:
Wed Jul 16 14:32:49 CST 2014, org.apache.hadoop.hbase.client.RpcRetryingCaller@52380405, java.lang.IllegalAccessError: class com.google.protobuf.HBaseZeroCopyByteString cannot access its superclass com.google.protobuf.LiteralByteString
Wed Jul 16 14:32:52 CST 2014, org.apache.hadoop.hbase.client.RpcRetryingCaller@52380405, java.lang.IllegalAccessError: com/google/protobuf/HBaseZeroCopyByteString
Wed Jul 16 14:32:57 CST 2014, org.apache.hadoop.hbase.client.RpcRetryingCaller@52380405, java.lang.IllegalAccessError: com/google/protobuf/HBaseZeroCopyByteString
Wed Jul 16 14:33:07 CST 2014, org.apache.hadoop.hbase.client.RpcRetryingCaller@52380405, java.lang.IllegalAccessError: com/google/protobuf/HBaseZeroCopyByteString
Wed Jul 16 14:33:28 CST 2014, org.apache.hadoop.hbase.client.RpcRetryingCaller@52380405, java.lang.IllegalAccessError: com/google/protobuf/HBaseZeroCopyByteString
Wed Jul 16 14:34:08 CST 2014, org.apache.hadoop.hbase.client.RpcRetryingCaller@52380405, java.lang.IllegalAccessError: com/google/protobuf/HBaseZeroCopyByteString
Wed Jul 16 14:35:49 CST 2014, org.apache.hadoop.hbase.client.RpcRetryingCaller@52380405, java.lang.IllegalAccessError: com/google/protobuf/HBaseZeroCopyByteString
Wed Jul 16 14:37:29 CST 2014, org.apache.hadoop.hbase.client.RpcRetryingCaller@52380405, java.lang.IllegalAccessError: com/google/protobuf/HBaseZeroCopyByteString
Wed Jul 16 14:39:10 CST 2014, org.apache.hadoop.hbase.client.RpcRetryingCaller@52380405, java.lang.IllegalAccessError: com/google/protobuf/HBaseZeroCopyByteString
Wed Jul 16 14:40:50 CST 2014, org.apache.hadoop.hbase.client.RpcRetryingCaller@52380405, java.lang.IllegalAccessError: com/google/protobuf/HBaseZeroCopyByteString

at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:134)
at org.apache.hadoop.hbase.client.HTable.getRowOrBefore(HTable.java:705)
at org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:144)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.prefetchRegionCache(HConnectionManager.java:1102)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:1162)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:1054)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:1011)
at org.apache.hadoop.hbase.client.HTable.finishSetup(HTable.java:326)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:192)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:150)
at org.apache.hadoop.hbase.mapreduce.TableOutputFormat.setConf(TableOutputFormat.java:206)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:73)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133)
at org.apache.hadoop.mapreduce.JobSubmitter.checkSpecs(JobSubmitter.java:455)
at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:343)
at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1295)
at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1292)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:1292)
at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1313)
at mapreduce.ImportFromFile.run(ImportFromFile.java:228)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
at mapreduce.ImportFromFile.main(ImportFromFile.java:185)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:72)
at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:144)
at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:152)
at mapreduce.Driver.main(Driver.java:29)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.util.RunJar.main(RunJar.java:212)
Caused by: java.lang.IllegalAccessError: com/google/protobuf/HBaseZeroCopyByteString
at org.apache.hadoop.hbase.protobuf.RequestConverter.buildRegionSpecifier(RequestConverter.java:897)
at org.apache.hadoop.hbase.protobuf.RequestConverter.buildGetRowOrBeforeRequest(RequestConverter.java:131)
at org.apache.hadoop.hbase.protobuf.ProtobufUtil.getRowOrBefore(ProtobufUtil.java:1402)
at org.apache.hadoop.hbase.client.HTable$2.call(HTable.java:701)
at org.apache.hadoop.hbase.client.HTable$2.call(HTable.java:699)
at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:120)
... 38 more
Exception in thread "main" java.lang.IllegalAccessError: com/google/protobuf/HBaseZeroCopyByteString
at org.apache.hadoop.hbase.protobuf.RequestConverter.buildRegionSpecifier(RequestConverter.java:897)
at org.apache.hadoop.hbase.protobuf.RequestConverter.buildGetRowOrBeforeRequest(RequestConverter.java:131)
at org.apache.hadoop.hbase.protobuf.ProtobufUtil.getRowOrBefore(ProtobufUtil.java:1402)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:1176)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:1054)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:1011)
at org.apache.hadoop.hbase.client.HTable.finishSetup(HTable.java:326)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:192)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:150)
at org.apache.hadoop.hbase.mapreduce.TableOutputFormat.setConf(TableOutputFormat.java:206)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:73)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133)
at org.apache.hadoop.mapreduce.JobSubmitter.checkSpecs(JobSubmitter.java:455)
at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:343)
at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1295)
at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1292)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:1292)
at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1313)
at mapreduce.ImportFromFile.run(ImportFromFile.java:228)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
at mapreduce.ImportFromFile.main(ImportFromFile.java:185)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:72)
at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:144)
at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:152)
at mapreduce.Driver.main(Driver.java:29)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.util.RunJar.main(RunJar.java:212)