1. 序言

出于工作需要，使用mac + IntelliJ IDEA，搭建了一个可以访问Hive的本地开发环境

执行查询时报错：

Query 20220422_084012_00000_34axr failed: Unable to create input format org.apache.hadoop.mapred.TextInputFormat

查看日志，具体的报错信息如下：

com.facebook.presto.spi.PrestoException: Unable to create input format org.apache.hadoop.mapred.TextInputFormat
	at com.facebook.presto.hive.HiveUtil.getInputFormat(HiveUtil.java:328)
	at com.facebook.presto.hive.BackgroundHiveSplitLoader.loadPartition(BackgroundHiveSplitLoader.java:299)
	at com.facebook.presto.hive.BackgroundHiveSplitLoader.loadSplits(BackgroundHiveSplitLoader.java:272)
	// 省略部分内容
Caused by: java.lang.RuntimeException: Error in configuring object
	at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:112)
	at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:78)
	at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:136)
	at com.facebook.presto.hive.HiveUtil.getInputFormat(HiveUtil.java:325)
	... 11 more
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:109)
	... 14 more
Caused by: java.lang.IllegalArgumentException: Compression codec com.hadoop.compression.lzo.LzoCodec not found.
	at org.apache.hadoop.io.compress.CompressionCodecFactory.getCodecClasses(CompressionCodecFactory.java:139)
	at org.apache.hadoop.io.compress.CompressionCodecFactory.<init>(CompressionCodecFactory.java:180)
	at org.apache.hadoop.mapred.TextInputFormat.configure(TextInputFormat.java:45)
	... 19 more
Caused by: java.lang.ClassNotFoundException: Class com.hadoop.compression.lzo.LzoCodec not found
	at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:2101)
	at org.apache.hadoop.io.compress.CompressionCodecFactory.getCodecClasses(CompressionCodecFactory.java:132)
	... 21 more

从报错信息看，应该是java.lang.ClassNotFoundException: Class com.hadoop.compression.lzo.LzoCodec not found导致Unable to create input format org.apache.hadoop.mapred.TextInputFormat

2. 解决办法

2.1 确认缺失的maven依赖

按照之前使用Flink jar任务实现ETL时的经验来看，ClassNotFoundException一般都是因为程序在运行时无法找到对应的类
这时候，可以通过IDEA的快捷键查找com.hadoop.compression.lzo.LzoCodec这个类
通过查看这两个类，发现在分别位于lzo-hadoop-1.0.5.jar和hadoop-lzo-0.4.15-cdh5.14.4.jar
在presto项目目录下，通过find命令搜索jar包，发现hadoop-lzo-0.4.15-cdh5.14.4.jar在本地磁盘中存在
大胆推测，缺少的应该是hadoop-lzo-0.4.15-cdh5.14.4.jar对应的maven依赖

2.2 解决办法

根据jar包名与maven依赖写法之间的关系，同时结合网上搜索的结果，确定了maven依赖的写法如下：

<dependency>
    <groupId>com.hadoop.gplcompression</groupId>
    <artifactId>hadoop-lzo</artifactId>
    <version>0.4.15-cdh5.14.4</version>
    <scope>runtime</scope>
</dependency>

将该依赖添加到presto-hive-hadoop2模块的pom.xml文件中

2.3 为什么使用`runtime`作为依赖范围？

最开始时，并未指定scope，默认使用compile类型的scope

编译时报错：

[INFO] --- maven-dependency-plugin:3.1.1:analyze-only (default) @ presto-hive-hadoop2 ---
[WARNING] Unused declared dependencies found:
[WARNING]    com.hadoop.gplcompression:hadoop-lzo:jar:0.4.15-cdh5.14.4:compile

说明，在编译时并不需要该依赖，于是改成了runtime类型的scope

2.4 重新编译模块，解决问题

进入presto-hive-hadoop2模块的根目录，执行maven命令重新编译该模块
```
mvn clean install -DskipTests
```
编译完成后，重新运行Presto服务，查询OK

3. 题外话

3.1 如何确定模块？

不要问我怎么知道应该修改这个模块的pom文件，我只想说这是来自同事的提点和自多次尝试后的结果
后面回过头来看，编译后的Presto安装包的plugin目录中存在hadoop-lzo-0.4.15-cdh5.14.4.jar

同时，结合编译时的fileSet配置配置，说明hive-hadoop2目录对应的应该就是presto-hive-hadoop2模块

<fileSet>
    <directory>${project.build.directory}/dependency/presto-hive-hadoop2-${project.version}</directory>
    <outputDirectory>plugin/hive-hadoop2</outputDirectory>
</fileSet>

3.2 Could not load native gpl library错误

虽然查询成功了，但执行日志中却存在Could not load native gpl library的错误

2022-04-22T17:33:30.362+0800	ERROR	hive-hive-0	com.hadoop.compression.lzo.GPLNativeCodeLoader	Could not load native gpl library
java.lang.UnsatisfiedLinkError: no gplcompression in java.library.path
	at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1867)
	at java.lang.Runtime.loadLibrary0(Runtime.java:870)
	at java.lang.System.loadLibrary(System.java:1122)
	at com.hadoop.compression.lzo.GPLNativeCodeLoader.<clinit>(GPLNativeCodeLoader.java:32)
	at com.hadoop.compression.lzo.LzoCodec.<clinit>(LzoCodec.java:71)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)
	at org.apache.hadoop.conf.Configuration.getClassByNameOrNull(Configuration.java:2134)
	at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:2099)
	at org.apache.hadoop.io.compress.CompressionCodecFactory.getCodecClasses(CompressionCodecFactory.java:132)
	at org.apache.hadoop.io.compress.CompressionCodecFactory.<init>(CompressionCodecFactory.java:180)
	at org.apache.hadoop.mapred.TextInputFormat.configure(TextInputFormat.java:45)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:109)
	at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:78)
	at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:136)
	at com.facebook.presto.hive.HiveUtil.getInputFormat(HiveUtil.java:325)
	at com.facebook.presto.hive.BackgroundHiveSplitLoader.loadPartition(BackgroundHiveSplitLoader.java:299)
	at com.facebook.presto.hive.BackgroundHiveSplitLoader.loadSplits(BackgroundHiveSplitLoader.java:272)
	at com.facebook.presto.hive.BackgroundHiveSplitLoader.access$300(BackgroundHiveSplitLoader.java:102)
	at com.facebook.presto.hive.BackgroundHiveSplitLoader$HiveSplitLoaderTask.process(BackgroundHiveSplitLoader.java:201)
	at com.facebook.presto.hive.util.ResumableTasks.safeProcessTask(ResumableTasks.java:47)
	at com.facebook.presto.hive.util.ResumableTasks.access$000(ResumableTasks.java:20)
	at com.facebook.presto.hive.util.ResumableTasks$1.run(ResumableTasks.java:35)
	at com.facebook.airlift.concurrent.BoundedExecutor.drainQueue(BoundedExecutor.java:78)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)


2022-04-22T17:33:30.363+0800	ERROR	hive-hive-0	com.hadoop.compression.lzo.LzoCodec	Cannot load native-lzo without native-hadoop

参考了线上环境的配置，发现应该是缺少与compression有关的lib
自己尝试过，在jvm.config或者JVM启动参数中，给出相关的lib，但是依旧没有解决问题
```
-Djava.library.path=/path_to/hadoop-gpl-compression
```
还参考博客：Hadoop和Spark报com.hadoop.compression.lzo.LzoCodec not found错误集锦，添加了libhadoop、libsnappy有关的lib，也没有成功
其他参考博客，也讲得差不多都是这些lib
- pyspark ERROR lzo.GPLNativeCodeLoader: Could not load native gpl library
- Presto的坑记录