Fixed Issues in Cloud Connectors

Review the list of Cloud Connectors issues that are resolved in Cloudera Runtime 7.2.12.

CDPD-13652: hdfs copyFromLocal to abfs failed with OutOfMemoryError on DataMart Azure Cluster.

The abfs connector's output streams can buffer blocks to write on disk (default), byte array or off-heap bytebuffer. Configuration options allow queue length and size of shared pool of uploader threads to set. This issue is now resolved.