从Google App Engine连接到云端Bigtable [英] Connect to Cloud Bigtable from Google App Engine

问题描述

我使用以下库/依赖项：

< dependency>
< groupId> com.google.cloud.bigtable< / groupId>
< artifactId> bigtable-hbase-1.1< / artifactId>
< version> 0.1.9< / version>
< /依赖关系>


以下几行代码：

  import org.apache.hadoop.hbase.client.ConnectionFactory; 
导入org.apache.hadoop.hbase。*; 
配置conf = HBaseConfiguration.create（）; 
 connection = ConnectionFactory.createConnection（conf）; 
  

看来 ConnectionFactory.createConnection（）方法试图使用受限制的类。

你能帮我们解释我们如何在GAE上使用它？

 导致：java.lang.NoClassDefFoundError：java.lang .management.ManagementFactory是一个受限制的类。有关更多详细信息，请参阅Google App Engine开发人员指南。 
 at com.google.appengine.tools.development.agent.runtime.Runtime.reject（Runtime.java:52）
 at org.apache.hadoop.util.ReflectionUtils。< clinit>（ReflectionUtils .java：137）
在java.lang.Class.forName0（本地方法）$ b $在java.lang.Class.forName（Class.java:191）
在com.google.appengine .tools.development.agent.runtime.RuntimeHelper.checkRestricted（RuntimeHelper.java:70）
 at com.google.appengine.tools.development.agent.runtime.Runtime.checkRestricted（Runtime.java:65）
 at org.apache.hadoop.hbase.security.UserProvider.instantiate（UserProvider.java:45）
 at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection（ConnectionFactory.java:214）
 at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection（ConnectionFactory.java:119）
 at org.energyworx.datastore.BigTableTSStorage。< init>（BigTableTSStorage.java:104）
在sun.reflect.NativeConstructorAccessorImpl.newInstance0（Nati （方法）
 at sun.reflect.NativeConstructorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:57）
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:45）
 at java.lang。 $ java.lang.Class.newInstance（Class.java:379）$ b $ java.util.ServiceLoader $ b $ $ $ LazyIterator.next（ServiceLoader.java： 373）
 ... 71 more 
  

解决方案

我已经更新了 GitHub 。

It appears that I cannot create a connection from Java class running on AppEngine.

I use the following library/dependency:

<dependency>
   <groupId>com.google.cloud.bigtable</groupId>
   <artifactId>bigtable-hbase-1.1</artifactId>
   <version>0.1.9</version>
</dependency>

And the following lines of code:

import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.*;
Configuration conf = HBaseConfiguration.create();
connection  = ConnectionFactory.createConnection(conf);

It appears that the ConnectionFactory.createConnection() method tries to use a restricted class.

Could you help us in explaining how we can use this on GAE?

I get the following error when running locally on devserver:

 Caused by: java.lang.NoClassDefFoundError: java.lang.management.ManagementFactory is a restricted class. Please see the Google  App Engine developer's guide for more details.
    at     com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:52)
        at org.apache.hadoop.util.ReflectionUtils.<clinit>(ReflectionUtils.java:137)
        at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:191)
    at com.google.appengine.tools.development.agent.runtime.RuntimeHelper.checkRestricted(RuntimeHelper.java:70)
    at com.google.appengine.tools.development.agent.runtime.Runtime.checkRestricted(Runtime.java:65)
    at org.apache.hadoop.hbase.security.UserProvider.instantiate(UserProvider.java:45)
    at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:214)
    at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:119)
    at org.energyworx.datastore.BigTableTSStorage.<init>(BigTableTSStorage.java:104)
    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 java.lang.Class.newInstance(Class.java:379)
    at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:373)
    ... 71 more

解决方案

I've updated the sample on GitHub.

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