Rebalance Disk with dryrun true Pending and Never Show Proposal

[imans777]

Hi,
When trying to rebalance disk with dry run true, in a large cluster, it takes several minutes in our case. This causes the CC to show a pending in the response. But the problem is when I try the API again, it seems it sends a new request for generating proposal and doesn't show the previous status. After 5 attempts, it show me "there are already 5 process running in servlet" and the system stucks for about half an hour.
I expect that I can fetch the response from previous request, not making a new request. There aren't any parameters shown in documents that I can use the previous session/task. Now, I can't run disk rebalance with dryrun=true, and I can't have a preview of what is going to change in the cluster. I can only run it with dryrun=false, wait several minutes, and then watch the executor API and from what's running I can only see what's changing, not before execution.
Thanks.