Hello Pravin,
Thanks for contacting the Pivotal Support Community!.
That said, please make sure you have followed all the steps mentioned in Upgrade from Version 8.2 to Version 9 [1].
If the issue still persists, I'd recommend to open a new Support Ticket through the Pivotal Support Portal [2], this kind of issues require some analysis of artefacts (logs, configuration files, statistics, thread dumps, etc.) in order to troubleshoot.
Best regards.
[1]: https://gemfire.docs.pivotal.io/98/gemfire/getting_started/upgrade/upgrade_standalone.html
[2]: https://pivotal.io/support