I’m trying to delete a large number of time series tables in batches using Apache IoTDB (version 1.2.2). My current approach involves calling the method void deleteTimeseries(List<String> paths). However, after deleting around 1 million time series and continuing deletion in batches of 500 each time, I encountered an issue.

Apache IoTDB often get stuck in SessionPool, and the system reported org.apache.iotdb.session.pool.SessionPool: current occupied size 50, queue size 0, considered size 50. After this information, the system also mentioned that SessionPool has wait for 60 seconds to get a new connection. I checked the official guide and did not find any relevant instruction for this kind of message.