"The HTTP REST API supports the complete FileSystem/FileContext interface for HDFS. The operations and the corresponding FileSystem/FileContext methods are shown in the next section. The Section HTTP Query Parameter Dictionary specifies the parameter details such as the defaults and the valid values
「Unable to start the Universal Connection Pool」「oracle.ucp.UniversalConnectionPoolException: Failed to create initialPoolSize connections while starting a pool: java.lang.IllegalStateException: unable to start connection creation task」