Hbase、elasticsearch整合中jar包冲突的问题解决
问题背景
再数据平台中,项目搭建需要使用es和hbase搭建数据查询接口,整合的过程中出现jar包冲突的bug :com.google.common.base.stopwatch.()v from class org.apache.hadoop.hbase.zookeeper.metatablelocator
org.apache.hadoop.hbase.donotretryioexception: java.lang.illegalaccesserror: tried to access method com.google.common.base.stopwatch.<init>()v from class org.apache.hadoop.hbase.zookeeper.metatablelocator at org.apache.hadoop.hbase.client.rpcretryingcaller.translateexception(rpcretryingcaller.java:239) at org.apache.hadoop.hbase.client.rpcretryingcaller.callwithretries(rpcretryingcaller.java:150) ... at java.lang.thread.run(thread.java:745) caused by: java.lang.illegalaccesserror: tried to access method com.google.common.base.stopwatch.<init>()v from class org.apache.hadoop.hbase.zookeeper.metatablelocator at org.apache.hadoop.hbase.zookeeper.metatablelocator.blockuntil ... at org.apache.hadoop.hbase.client.regionservercallable.prepare(regionservercallable.java:75) at org.apache.hadoop.hbase.client.rpcretryingcaller.callwithretries(rpcretryingcaller.java:134) ... 45 more
解决办法
经排查,确认是因为 com.google.guava 这个包引起的冲突。es依赖于18及以上版本,而hbase只支持16及以上版本。而guava这个包从17开始内部发生变化,方法发生改变,所以18并不会向下兼容16版本。在项目运行的过程中,如果同时引入16、18版本,es及hbase的调用过程会发生混乱。那么接下来就好办了,我们可以重新打包,将guava18打入es内部,再在pom文件中显示引用guava16版本的包。这样,es调用包内部打入的guava18,而hbase调用外部的guava16。
重新打包
新建maven工程,在pom文件中进行如下配置:
<?xml version="1.0" encoding="utf-8"?> <project xmlns="http://maven.apache.org/pom/4.0.0" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="http://maven.apache.org/pom/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelversion>4.0.0</modelversion> <!-- this maven project is aim to fix the jar comflic in hbase & elasticsearch. in es, required guava 18+ or up. but in hbase you should use guava 16- or blow. cd the project directory and run 'sh ./cleanbuild.sh',you will get a new-self jar. then, adjust your project pom.xml whth: <dependency> <groupid>douguo.shaded.elasticsearch</groupid> <artifactid>douguo_shaded_elasticsearch</artifactid> <version>1.0-snapshot</version> <exclusions> <exclusion> <groupid>org.elasticsearch</groupid> <artifactid>elasticsearch</artifactid> </exclusion> </exclusions> </dependency> finally, your jar comflic will be fixed. @date:2017-11-30 @author:zhangjianfei @since:douguo.shaded.elasticsearch-1.0.0 --> <groupid>douguo.shaded.elasticsearch</groupid> <artifactid>douguo_shaded_elasticsearch</artifactid> <version>1.0-snapshot</version> <properties> <elasticsearch.version>2.4.1</elasticsearch.version> </properties> <dependencies> <dependency> <groupid>org.elasticsearch</groupid> <artifactid>elasticsearch</artifactid> <version>${elasticsearch.version}</version> </dependency> <dependency> <groupid>org.elasticsearch.plugin</groupid> <artifactid>shield</artifactid> <version>${elasticsearch.version}</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupid>org.apache.maven.plugins</groupid> <artifactid>maven-shade-plugin</artifactid> <version>2.4.1</version> <configuration> <createdependencyreducedpom>false</createdependencyreducedpom> </configuration> <executions> <execution> <phase>package</phase> <goals> <goal>shade</goal> </goals> <configuration> <relocations> <relocation> <pattern>com.google.guava</pattern> <shadedpattern>douguo.shaded.elasticsearch.guava</shadedpattern> </relocation> <relocation> <pattern>org.joda</pattern> <shadedpattern>douguo.shaded.elasticsearch.joda</shadedpattern> </relocation> <relocation> <pattern>com.google.common</pattern> <shadedpattern>douguo.shaded.elasticsearch.common</shadedpattern> </relocation> <relocation> <pattern>com.google.thirdparty</pattern> <shadedpattern>douguo.shaded.elasticsearch.thirdparty</shadedpattern> </relocation> </relocations> <transformers> <transformer implementation="org.apache.maven.plugins.shade.resource.manifestresourcetransformer" /> </transformers> </configuration> </execution> </executions> </plugin> </plugins> </build> <repositories> <repository> <id>elasticsearch-releases</id> <url>http://maven.elasticsearch.org/releases</url> <releases> <enabled>true</enabled> <updatepolicy>daily</updatepolicy> </releases> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories> </project>
将org.joda等4个可能有冲突的jar包通过maven-shade-plugin插件迁移后重新打个jar包从而使得在引入这个jar包时能够使用该jar包自己的依赖而不是使用外部依赖。这里需要注意的是,需要将com.google.common等4个包全部重新迁移,否则会出现java.lang.illegalaccesserror: tried to access method com.google.common.base的错误
项目打包
mvn clean install
新的依赖包会在.m2 maven仓库中,如果公司搭建了仓库的话,需要上传jar包。如果直接运行jar包的话,记得重新编译项目,并替换lib目录
项目载入新包
只需要在pom文件中配置:
<!-- douguo.shaded.elasticsearch --> <dependency> <groupid>douguo.shaded.elasticsearch</groupid> <artifactid>douguo_shaded_elasticsearch</artifactid> <version>1.0-snapshot</version> <exclusions> <exclusion> <groupid>org.elasticsearch</groupid> <artifactid>elasticsearch</artifactid> </exclusion> </exclusions> </dependency> <!-- https://mvnrepository.com/artifact/com.google.guava/guava --> <!-- this guava is only used in habse in es, 18.0+ is required, but hbase only supported 16.0 or blow. clean as install douguo.shaded.elasticsearch --> <dependency> <groupid>com.google.guava</groupid> <artifactid>guava</artifactid> <version>16.0</version> </dependency>
这样,guava18包就在douguo.shaded.elasticsearch下,es会优先调用。而外部配置的guava16就会被hbase调用。2个版本的jar包互相独立存在!
到此,问题就解决了!
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