Imagine, that you need to use the HBase client 1.x and gRPC in the same Java application. The code for connecting dependencies to Maven will look something like this:
<!-- HBase -->
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-client</artifactId>
<version>1.2.3</version>
</dependency>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-common</artifactId>
<version>1.2.3</version>
</dependency>
<!-- gRPC -->
<dependency>
<groupId>io.grpc</groupId>
<artifactId>grpc-netty</artifactId>
<version>1.16.1</version>
</dependency>
<dependency>
<groupId>io.grpc</groupId>
<artifactId>grpc-protobuf</artifactId>
<version>1.16.1</version>
</dependency>
<dependency>
<groupId>io.grpc</groupId>
<artifactId>grpc-stub</artifactId>
<version>1.16.1</version>
</dependency>If you run the application and execute the request through the HBase client, there will be an exception:
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.blockUntilAvailable(MetaTableLocator.java:601) ...The problem is that hbase-client 1.x uses an earlier version of Google Protobuf – 2.5.0, than gRPC. Sometimes the problem appears because Guava version difference.
You can try two different solutions.
Use hbase-shaded-client 1.x
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-shaded-client</artifactId>
<version>1.2.3/version>
</dependency>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-common</artifactId>
<version>1.2.3</version>
</dependency>Use hbase-client 2.x
Starting with the HBase client version 2.0.0, the shaded Protobuf classes appeared there, so there is no conflict. You need to update the HBase client version to 2.0.0:
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-client</artifactId>
<version>2.0.0</version>
</dependency>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-common</artifactId>
<version>2.0.0</version>
</dependency>But do this very carefully, because hbase-client 2.x s NOT fully compatible with hbase-server 1.x. For example, the Admin API is going to broke. Sometimes you can face with unclear errors under the heavy load. So you need to test it very precisely.
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