When Jenkins enters safe mode, if the executor is not shut down, the backup cannot be started, and the safe mode cannot be canceled, and Jenkins cannot run normally.

      I gave the solution:When entering safe mode, force shutdown of running executors,

      This will start the backup normally。In "\src\main\java\org\jvnet\hudson\plugins\thinbackup\utils\Utils.java"

       if (!jenkins.isQuietingDown() && starttime + unit.toMillis(timeout) < System.currentTimeMillis()) {
      LOGGER.info("Force quiet mode for jenkins now and wait until all executors are idle.");
      jenkins.doQuietDown();
      //below is added by wangruxun
      for (final Computer computer : computers) {
      if (computer.countBusy() != 0)

      { computer.interrupt();//Force close the actuator }

      }
      }
      } while (running);
      }

          [JENKINS-69040] Thinbackup-safemode

            tofuatgit thomas Fürer
            wangruxun Wang Ruxun
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              Created:
              Updated: