hadoop - 标志 -useHCatalog 不工作

Question

我按照说明 here 在单个节点中安装了 CDH5.4 ，另外，我使用这些 instructions 将 hive-metastore 置于本地模式并且一切正常，除了当我尝试将 pig 与 metastore 连接时:

➜  ~  pig -useHCatalog
log4j:WARN No appenders could be found for logger (org.apache.hadoop.util.Shell).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
2015-05-01 15:45:08,657 [main] INFO  org.apache.pig.Main - Apache Pig version 0.12.0-cdh5.4.0 (rUnversioned directory) compiled Apr 21 2015, 12:19:15
2015-05-01 15:45:08,658 [main] INFO  org.apache.pig.Main - Logging error messages to: /home/itam/pig_1430495108571.log
2015-05-01 15:45:09,035 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:09,035 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:09,035 [main] INFO  org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - Connecting to hadoop file system at: hdfs://localhost:8020
2015-05-01 15:45:09,940 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:09,941 [main] INFO  org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - Connecting to map-reduce job tracker at: localhost:8021
2015-05-01 15:45:09,941 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:09,999 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:10,001 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:10,088 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:10,089 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:10,125 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:10,126 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:10,160 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:10,162 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:10,194 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:10,195 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:10,227 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:10,228 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:10,261 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:10,262 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
2015-05-01 15:45:10,295 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-01 15:45:10,296 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address

当我尝试访问该表时:

grunt> a = load 'ufos' using org.apache.hcatalog.pig.HCatLoader();
2015-05-01 15:46:11,656 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1070: Could not resolve org.apache.hcatalog.pig.HCatLoader using imports: [, java.lang., org.apache.pig.builtin., org.apache.pig.impl.builtin.]
Details at logfile: /home/itam/pig_1430495108571.log
grunt> 

Hadoop 版本

➜  ~  hadoop version
Hadoop 2.6.0-cdh5.4.0
Subversion http://github.com/cloudera/hadoop -r c788a14a5de9ecd968d1e2666e8765c5f018c271 
Compiled by jenkins on 2015-04-21T19:16Z
Compiled with protoc 2.5.0
From source with checksum cd78f139c66c13ab5cee96e15a629025
This command was run using /usr/lib/hadoop/hadoop-common-2.6.0-cdh5.4.0.jar

更新:我刚刚尝试使用 Impala，但它什么也没看到:

➜  ~  impala-shell                                                                                                                                                                                                                             
/usr/lib/python2.7/dist-packages/pkg_resources.py:1049: UserWarning: /home/itam/.python-eggs is writable by group/others and vulnerable to attack when used with get_resource_filename. Consider a more secure location (set with .set_extracti
on_path or the PYTHON_EGG_CACHE environment variable).
  warnings.warn(msg, UserWarning)
Starting Impala Shell without Kerberos authentication
Connected to 6b512e41337d:21000
Server version: impalad version 2.2.0-cdh5 RELEASE (build 2ffd73a4255cefd521362ffe1cfb37463f67f75c)
Welcome to the Impala shell. Press TAB twice to see a list of available commands.

Copyright (c) 2012 Cloudera, Inc. All rights reserved.

(Shell build version: Impala Shell v2.2.0-cdh5 (2ffd73a) built on Tue Apr 21 12:09:21 PDT 2015)
[6b512e41337d:21000] > invalidate metadata;
Query: invalidate metadata
[6b512e41337d:21000] > show tables;
Query: show tables

Fetched 0 row(s) in 0.00s

但来自直线:

~  beeline -u jdbc:hive2://
scan complete in 2ms
Connecting to jdbc:hive2://
Connected to: Apache Hive (version 1.1.0-cdh5.4.0)
Driver: Hive JDBC (version 1.1.0-cdh5.4.0)
Transaction isolation: TRANSACTION_REPEATABLE_READ
Beeline version 1.1.0-cdh5.4.0 by Apache Hive
0: jdbc:hive2://> show tables;
OK
+-----------+--+
| tab_name  |
+-----------+--+
| ufos      |
+-----------+--+
1 row selected (0.701 seconds)

它起作用了...发生了什么？

更新:我也在运行hcatalog

➜  ~  sudo service hive-webhcat-server status
 * WEBHCat server is running

➜  ~  hcat -e "desc ufos"                    
OK
timestamp               string                  from deserializer   
city                    string                  from deserializer   
state                   string                  from deserializer   
shape                   string                  from deserializer   
duration                string                  from deserializer   
summary                 string                  from deserializer   
posted                  string                  from deserializer   
Time taken: 1.314 seconds

更新:impala 的问题是因为我没有将hive-site.xml 复制到/etc/impala/conf，完成后，impala-shell 正常工作。

Answer 1

您正在使用的加载程序已弃用。您需要使用 org.apache.hive.hcatalog.pig.HCatLoader，而不是使用 org.apache.hcatalog.pig.HCatLoader。

来自 org.apache.hcatalog.pig.HCatLoader :

Deprecated. Use/modify HCatLoader instead