EMR Core nodes are not taking up map reduce jobs

Question

I have a 2 node EMR (Version 4.6.0) Cluster (1 master (m4.large) , 1 core (r4.xlarge) ) with HBase installed. I'm using default EMR configurations. I want to export HBase tables using

hbase org.apache.hadoop.hbase.mapreduce.Export -D hbase.mapreduce.include.deleted.rows=true Table_Name hdfs:/full_backup/Table_Name 1

I'm getting the following error

2022-04-04 11:29:20,626 INFO  [main] util.RegionSizeCalculator: Calculating region sizes for table "Table_Name".
2022-04-04 11:29:20,900 INFO  [main] client.ConnectionManager$HConnectionImplementation: Closing master protocol: MasterService
2022-04-04 11:29:20,900 INFO  [main] client.ConnectionManager$HConnectionImplementation: Closing zookeeper sessionid=0x17ff27095680070
2022-04-04 11:29:20,903 INFO  [main-EventThread] zookeeper.ClientCnxn: EventThread shut down for session: 0x17ff27095680070
2022-04-04 11:29:20,904 INFO  [main] zookeeper.ZooKeeper: Session: 0x17ff27095680070 closed
2022-04-04 11:29:20,980 INFO  [main] mapreduce.JobSubmitter: number of splits:1
2022-04-04 11:29:20,994 INFO  [main] Configuration.deprecation: io.bytes.per.checksum is deprecated. Instead, use dfs.bytes-per-checksum
2022-04-04 11:29:21,192 INFO  [main] mapreduce.JobSubmitter: Submitting tokens for job: job_1649071534731_0002
2022-04-04 11:29:21,424 INFO  [main] impl.YarnClientImpl: Submitted application application_1649071534731_0002
2022-04-04 11:29:21,454 INFO  [main] mapreduce.Job: The url to track the job: http://ip-10-0-2-244.eu-west-1.compute.internal:20888/proxy/application_1649071534731_0002/
2022-04-04 11:29:21,455 INFO  [main] mapreduce.Job: Running job: job_1649071534731_0002
2022-04-04 11:29:28,541 INFO  [main] mapreduce.Job: Job job_1649071534731_0002 running in uber mode : false
2022-04-04 11:29:28,542 INFO  [main] mapreduce.Job:  map 0% reduce 0%

It is stuck at this progress and not running. However when I add a task node and redo the same command, it gets finished within seconds. Based on the documentation, https://docs.aws.amazon.com/emr/latest/ManagementGuide/emr-master-core-task-nodes.html , core node itself should handle tasks as well. What could be going wrong?