Hadoop集群中增加与ElasticSearch连接的操作

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Hadoop集群中增加与ElasticSearch连接的操作

调皮仔3683 2018-05-29 11:53:03 浏览10118
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在没有引入elasticsearch-hadoop-xxx.jar相应的Jar包时,的在Hive中执行ElasticSearch外部表操作,会报如下的异常:

Exception in thread "main" java.io.IOException: Failed on local exception: com.google.protobuf.InvalidProtocolBufferException: Protocol message end-group tag did not match expected tag.; Host Details : local host is: "ip-172-17-30-146/172.17.30.146"; destination host is: "ip-172-17-30-146":9000;   

通过Spark查看执行任务的MR日志,报错如下:

.hadoop.mapreduce.v2.app.MRAppMaster failed in state INITED; cause: org.apache.hadoop.yarn.exceptions.YarnRuntimeException: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class org.elasticsearch.hadoop.mr.EsOutputFormat not found  
org.apache.hadoop.yarn.exceptions.YarnRuntimeException: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class org.elasticsearch.hadoop.mr.EsOutputFormat not found  

此时报的是Yarn服务器上面找不到ES-Hadoop相关的类,此时需要做的将elasticsearch-hadoop-xxx.jar增加到Hadoop相关应用的环境中,根据目前我所用到的环境,需要增加的应用有:

1.Hive  
2.Spark  
3.Yarn  

需要将elasticsearch-hadoop-xxx.jar增加到所有服务器这些应用的环境中,然后重新执行执行就不会报这个问题了。

另外:目前我的做法是手动将elasticsearch-hadoop-6.2.4.jar一台一台复制到Yarn服务器的lib目录下,不知道CDH是否有简化的管理功能,可以直接上传对应的Jar包?

为了操作上的操作,我准备了一个批命令,命令记录如下:

#/data/share_libs是我的第三共享jar包的目录  
cd /data/share_libs  
wget https://artifacts.elastic.co/downloads/elasticsearch-hadoop/elasticsearch-hadoop-6.2.4.zip  
unzip elasticsearch-hadoop-6.2.4.zip  
cd elasticsearch-hadoop-6.2.4/dist  
#注:这里不要把所有elasticsearch-hadoop*.jar文件都拷贝过去了,否则Yarn中会报这些不同的Jar包的版本冲突  
mv elasticsearch-hadoop-6.2.4.jar /opt/cloudera/parcels/CDH-5.14.2-1.cdh5.14.2.p0.3/jars/  
cd /data/share_libs  
#删除不必要的资源  
rm -f elasticsearch-hadoop-6.2.4.zip  
rm -rf elasticsearch-hadoop-6.2.4  
#注:目录/data/share_libs,在Spark中设置为了其第三库的目录,在Hive中也设置为了其auxlib目录,因而在这里建立软件链接后,Spark和Hive都可以使用  
#Spark中设置第三库的目录,可以参看前面一篇文章:https://blog.csdn.net/fenglibing/article/details/80437246  
ln -s /opt/cloudera/parcels/CDH-5.14.2-1.cdh5.14.2.p0.3/jars/elasticsearch-hadoop-6.2.4.jar elasticsearch-hadoop-6.2.4.jar  
cd /opt/cloudera/parcels/CDH-5.14.2-1.cdh5.14.2.p0.3/lib/hadoop-yarn/lib  
ln -s /opt/cloudera/parcels/CDH-5.14.2-1.cdh5.14.2.p0.3/jars/elasticsearch-hadoop-6.2.4.jar elasticsearch-hadoop-6.2.4.jar  

以下是通过创建一个外部表,然后测试查询的语句:

create external table test_in_es  
(  
    id string,  
    k string,  
    v string  
)  
STORED BY 'org.elasticsearch.hadoop.hive.EsStorageHandler'  
TBLPROPERTIES(  
'es.nodes' = 'http://vpc-es-xxxxxxxxx.eu-west-1.es.amazonaws.com:80',  
'es.index.auto.create' = 'false',  
'es.nodes.wan.only' = 'true',  
'es.resource' = 'test/test',  
'es.read.metadata' = 'true',  
'es.mapping.names' = 'id:_metadata._id,k:k, v:v');  
  
select * from test_in_es;  

如果遇到“EsHadoopIllegalArgumentException:No data nodes with HTTP-enabled available”这样的异常,请查看这篇文章:https://blog.csdn.net/fenglibing/article/details/80478551

更多参考:大数据开发

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