Not able to read/write to/from HDFS which is configured in CM,
Error : Not able able to get new block ...the HDFS status is green and all the datandoes and nameNode are active and there is no issue with them.
org.apache.hadoop.hdfs.BlockMissingException: Could not obtain block:
Please provide the command you are running and the exact result so we can be sure we understand the problem.
It appears you have tried writing and reading. Please show us the command and result for both.
With that information, we can probably start making some suggestions.