Hi everyone,
I'm getting this error while running Ratis:
Caused by: java.io.IOException: java.lang.NoClassDefFoundError:
org/apache/hadoop/metrics2/lib/DefaultMetricsSystem
at org.apache.ratis.util.IOUtils.asIOException(IOUtils.java:54)
at org.apache.ratis.util.IOUtils.toIOException(IOUtils.java:61)
at org.apache.ratis.util.IOUtils.getFromFuture(IOUtils.java:70)
at
org.apache.ratis.server.impl.RaftServerProxy.getImpls(RaftServerProxy.java:284)
at
org.apache.ratis.server.impl.RaftServerProxy.start(RaftServerProxy.java:296)
at test.cluster.ClusterSevice.start(ClusterSevice.java:85)
... 65 more
Caused by: java.lang.NoClassDefFoundError:
org/apache/hadoop/metrics2/lib/DefaultMetricsSystem
at
org.apache.ratis.metrics.MetricsReporting.<clinit>(MetricsReporting.java:42)
at
org.apache.ratis.server.metrics.RatisMetrics.<clinit>(RatisMetrics.java:39)
at
org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogWorker.<init>(SegmentedRaftLogWorker.java:176)
at
org.apache.ratis.server.raftlog.segmented.SegmentedRaftLog.<init>(SegmentedRaftLog.java:197)
at
org.apache.ratis.server.raftlog.segmented.SegmentedRaftLog.<init>(SegmentedRaftLog.java:183)
at
org.apache.ratis.server.impl.ServerState.initRaftLog(ServerState.java:188)
at
org.apache.ratis.server.impl.ServerState.<init>(ServerState.java:120)
at
org.apache.ratis.server.impl.RaftServerImpl.<init>(RaftServerImpl.java:110)
at
org.apache.ratis.server.impl.RaftServerProxy.lambda$newRaftServerImpl$2(RaftServerProxy.java:208)
at
java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1700)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.ClassNotFoundException:
org.apache.hadoop.metrics2.lib.DefaultMetricsSystem
at
java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)
at
java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
... 13 more
AFAICT this is a class in the dependency
org.apache.hadoop:hadoop-common:3.1.1. I'm running with the dependencies
and Ratis 0.4.0
<dependency>
<artifactId>ratis-server</artifactId>
<groupId>org.apache.ratis</groupId>
<exclusions>
<exclusion>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
</exclusion>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<artifactId>ratis-grpc</artifactId>
<groupId>org.apache.ratis</groupId>
</dependency>
And which should be enough according to the documentation. While it's
possible to include this dependency, it pulls in a lot of other
dependencies. While org.apache.ratis.metrics.MetricsReporting class does
have a dependency on the
org.apache.hadoop.metrics2.lib.DefaultMetricsSystem class, ratis-metrics
doesn't define a dependency to org.apache.hadoop:hadoop-common:3.1.1 in
its pom. Is this intended or am I missing something?
Thank you for all your efforts.
/Henrik
