Known Issues in Impala
Known issues and technical limitations for Impala are addressed in Cloudera Runtime 7.1.9 SP2.
- CDPD-100746: Incorrect memory reservation accounting after abnormal executor termination
- If an executor backend terminates abnormally, the memory reserved accounting is not updated. This causes the admission controller to maintain an incorrect view of the reserved memory for that specific backend. Even after you restart the executor and add it back to the cluster, the reserved memory remains set to the value it held before the termination. This incorrect value persists even after the associated session is closed.
- CDPD-100741: Cancelling queries can cause lock contention on the coordinator
- The coordinator holds a lock while it sends the
CancelQueryFInstancesRPC. This action can cause delays for other threads that require this lock. In extreme cases, this can cause the RPC framework to stall, which might result in RPC timeouts. - CDPD-100118: Impala select queries fail with TableLoadingException during concurrent metadata operations
- Impala select queries can fail with a TableLoadingException when HMS is performing DROP partition operations on the same table at the same time.
