Thanks Diana! I just came on to post what we found for any future folks searching for a similar issue. It looks like this was potentially a client issue. We found this in the JDBC driver change log for 2.6.20 and it seemed to match the behavior we are seeing. [00265194][IMPJ-606 ] When the server returns 0 rows, the driver stops fetching results. We have updated our clients and have not been able to reproduce the issue. Presumably when the client incorrectly closes the connection, the server stops processing wherever it happens to be, which is why we see it stopping before the 100%. This is more of a symptom than the cause.  ... View more

@anis447 Did you ever find an answer to this? We are hitting the same thing. Sometimes it finishes with < 100% and a query will return no data. Other times it will get to 100% and the same query will return data.  Any information anyone has would be appreciated. -Dave ... View more

@Tim Armstrong any hints how to configure the JDBC connection to use impersonation? Assuming I use the recommended Cloudera drivers, can you send a code snippet that invokes a simple SQL query on behalf of some user Thanks! ... View more

@RamG  @EricL  https://docs.cloudera.com/documentation/enterprise/latest/topics/impala_delegation.html according to the link above Impala supports impersonation, however the client should to be using HiveServer2, not JDBC ... View more