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com.lambdaworks.redis.RedisException: java.util.ConcurrentModificationException	at com.lambdaworks.redis.cluster.PooledClusterConnectionProvider.getConnection(PooledClusterConnectionProvider.java:77)	at com.lambdaworks.redis.cluster.ClusterDistributionChannelWriter.write(ClusterDistributionChannelWriter.java:98)	at com.lambdaworks.redis.RedisChannelHandler.dispatch(RedisChannelHandler.java:118)	at com.lambdaworks.redis.cluster.StatefulRedisClusterConnectionImpl.dispatch(StatefulRedisClusterConnectionImpl.java:189)	at com.lambdaworks.redis.AbstractRedisAsyncCommands.dispatch(AbstractRedisAsyncCommands.java:1798)	at com.lambdaworks.redis.AbstractRedisAsyncCommands.hkeys(AbstractRedisAsyncCommands.java:437)	at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at com.lambdaworks.redis.cluster.StatefulRedisClusterConnectionImpl$ClusterFutureSyncInvocationHandler.handleInvocation(StatefulRedisClusterConnectionImpl.java:334)	at com.lambdaworks.redis.internal.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:54)	at com.sun.proxy.$Proxy17.hkeys(Unknown Source)	at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:145)	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:787)	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)	at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:163)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.Subject.doAs(Subject.java:422)	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1671)