我试图用象鸟来查询一些示例protobuf的数据。 我使用的是通讯录例子，我连载了一把假AddressBooks成文件，并把它们在/用户/富/数据/大象鸟/ addressbooks HDFS /查询返回任何结果
我设置表和查询，像这样：
add jar /home/foo/downloads/elephant-bird/hadoop-compat/target/elephant-bird-hadoop-compat-4.6-SNAPSHOT.jar;
add jar /home/foo/downloads/elephant-bird/core/target/elephant-bird-core-4.6-SNAPSHOT.jar;
add jar /home/foo/downloads/elephant-bird/hive/target/elephant-bird-hive-4.6-SNAPSHOT.jar;
create external table addresses
row format serde "com.twitter.elephantbird.hive.serde.ProtobufDeserializer"
with serdeproperties (
"serialization.class"="com.twitter.data.proto.tutorial.AddressBookProtos$AddressBook")
STORED AS
-- elephant-bird provides an input format for use with hive
INPUTFORMAT "com.twitter.elephantbird.mapred.input.DeprecatedRawMultiInputFormat"
-- placeholder as we will not be writing to this table
OUTPUTFORMAT "org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat"
LOCATION '/user/foo/data/elephant-bird/addressbooks/';
describe formatted addresses;
OK
# col_name data_type comment
person array{ struct{ name:string, id:int, email:string, phone:array {struct {number:string, type:string}}}} from deserializer
byteData binary from deserializer
# Detailed Table Information
Database: default
Owner: foo
CreateTime: Tue Oct 28 13:49:53 PDT 2014
LastAccessTime: UNKNOWN
Protect Mode: None
Retention: 0
Location: hdfs://foo:8020/user/foo/data/elephant-bird/addressbooks
Table Type: EXTERNAL_TABLE
Table Parameters:
EXTERNAL TRUE
transient_lastDdlTime 1414529393
# Storage Information
SerDe Library: com.twitter.elephantbird.hive.serde.ProtobufDeserializer
InputFormat: com.twitter.elephantbird.mapred.input.DeprecatedRawMultiInputFormat
OutputFormat: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat
Compressed: No
Num Buckets: -1
Bucket Columns: []
Sort Columns: []
Storage Desc Params:
serialization.class com.twitter.data.proto.tutorial.AddressBookProtos$AddressBook
serialization.format 1
Time taken: 0.421 seconds, Fetched: 29 row(s)
当我尝试选择数据，它返回任何结果（不出现读取行）：
select count(*) from addresses; Total MapReduce jobs = 1 Launching Job 1 out of 1 Number of reduce tasks determined at compile time: 1 In order to change the average load for a reducer (in bytes): set hive.exec.reducers.bytes.per.reducer= In order to limit the maximum number of reducers: set hive.exec.reducers.max= In order to set a constant number of reducers: set mapred.reduce.tasks= Starting Job = job_1413311929339_0061, Tracking URL = http://foo:8088/proxy/application_1413311929339_0061/ Kill Command = /usr/lib/hadoop/bin/hadoop job -kill job_1413311929339_0061 Hadoop job information for Stage-1: number of mappers: 0; number of reducers: 1 2014-10-28 13:50:37,674 Stage-1 map = 0%, reduce = 0% 2014-10-28 13:50:51,055 Stage-1 map = 0%, reduce = 100%, Cumulative CPU 2.14 sec 2014-10-28 13:50:52,152 Stage-1 map = 0%, reduce = 100%, Cumulative CPU 2.14 sec MapReduce Total cumulative CPU time: 2 seconds 140 msec Ended Job = job_1413311929339_0061 MapReduce Jobs Launched: Job 0: Reduce: 1 Cumulative CPU: 2.14 sec HDFS Read: 0 HDFS Write: 2 SUCCESS Total MapReduce CPU Time Spent: 2 seconds 140 msec OK 0 Time taken: 37.519 seconds, Fetched: 1 row(s)
我看到同样的事情，如果我创建一个非外部表或者如果我明确地将数据导入到外部表。
我的设置版本信息：
Thrift 0.7 protobuf: libprotoc 2.5.0 hadoop: Hadoop 2.5.0-cdh5.2.0 Subversion http://github.com/cloudera/hadoop -r e1f20a08bde76a33b79df026d00a0c91b2298387 Compiled by jenkins on 2014-10-11T21:00Z Compiled with protoc 2.5.0 From source with checksum 309bccd135b199bdfdd6df5f3f4153d
更新：
我看到在日志中这个错误。 我在HDFS的数据只是原始的protobuf（无压缩）。 我想弄清楚，如果这是个问题，如果我可以读取原始二进制protobuf的。
Error: java.io.IOException: java.lang.reflect.InvocationTargetException
at org.apache.hadoop.hive.io.HiveIOExceptionHandlerChain.handleRecordReaderCreationException(HiveIOExceptionHandlerChain.java:97)
at org.apache.hadoop.hive.io.HiveIOExceptionHandlerUtil.handleRecordReaderCreationException(HiveIOExceptionHandlerUtil.java:57)
at org.apache.hadoop.hive.shims.HadoopShimsSecure$CombineFileRecordReader.initNextRecordReader(HadoopShimsSecure.java:346)
at org.apache.hadoop.hive.shims.HadoopShimsSecure$CombineFileRecordReader.(HadoopShimsSecure.java:293)
at org.apache.hadoop.hive.shims.HadoopShimsSecure$CombineFileInputFormatShim.getRecordReader(HadoopShimsSecure.java:407)
at org.apache.hadoop.hive.ql.io.CombineHiveInputFormat.getRecordReader(CombineHiveInputFormat.java:560)
at org.apache.hadoop.mapred.MapTask$TrackedRecordReader.(MapTask.java:168)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:409)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:342)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:167)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1554)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:162)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at org.apache.hadoop.hive.shims.HadoopShimsSecure$CombineFileRecordReader.initNextRecordReader(HadoopShimsSecure.java:332)
... 11 more
Caused by: java.io.IOException: No codec for file hdfs://foo:8020/user/foo/data/elephantbird/addressbooks/1000AddressBooks-1684394246.bin found
at com.twitter.elephantbird.mapreduce.input.MultiInputFormat.determineFileFormat(MultiInputFormat.java:176)
at com.twitter.elephantbird.mapreduce.input.MultiInputFormat.createRecordReader(MultiInputFormat.java:88)
at com.twitter.elephantbird.mapreduce.input.RawMultiInputFormat.createRecordReader(RawMultiInputFormat.java:36)
at com.twitter.elephantbird.mapred.input.DeprecatedInputFormatWrapper$RecordReaderWrapper.(DeprecatedInputFormatWrapper.java:256)
at com.twitter.elephantbird.mapred.input.DeprecatedInputFormatWrapper.getRecordReader(DeprecatedInputFormatWrapper.java:121)
at com.twitter.elephantbird.mapred.input.DeprecatedFileInputFormatWrapper.getRecordReader(DeprecatedFileInputFormatWrapper.java:55)
at org.apache.hadoop.hive.ql.io.CombineHiveRecordReader.(CombineHiveRecordReader.java:65)
... 16 more
