SensorDB becomes unresponsive during file upload

[nicholas512]

SensorDB sometimes becomes unresponsive when uploading observation files. This seems more likely to occur when there are more than 4 files in queue.

Log files from a recent event (below, observed at Thu Jul 13 14:32:41 UTC) do not show anything anomalous

Jul 12 16:42:57 cryopeg sensorDb[1368]: 2023-07-12 16:42:57,922[INFO ]: Upload notes:Large time offset.
Jul 12 16:42:57 cryopeg sensorDb[1368]: 2023-07-12 16:42:57,922[INFO ]: Uploaded file: /opt/sensorDb_Server/./media
Jul 13 13:13:10 cryopeg sensorDb[1368]: 2023-07-13 13:13:10,933[INFO ]: UploadServlet >put<
Jul 13 13:13:11 cryopeg sensorDb[1368]: 2023-07-13 13:13:10,937[INFO ]: Upload file is E50A78_20230124193606.csv
Jul 13 13:13:15 cryopeg sensorDb[1368]: 2023-07-13 13:13:15,507[INFO ]: File written to /opt/sensorDb_Server/./medi
Jul 13 13:13:15 cryopeg sensorDb[1368]: 2023-07-13 13:13:15,508[INFO ]: Upload initial_offset:0
Jul 13 13:13:15 cryopeg sensorDb[1368]: 2023-07-13 13:13:15,508[INFO ]: Upload final_offset:0
Jul 13 13:13:15 cryopeg sensorDb[1368]: 2023-07-13 13:13:15,508[INFO ]: Upload importer:Olivia Meier
Jul 13 13:13:15 cryopeg sensorDb[1368]: 2023-07-13 13:13:15,508[INFO ]: Upload notes:Large time offset.