Github user Fokko commented on the issue:
https://github.com/apache/spark/pull/21596
Some of the JSON endpoints are invalid, for example:
```
{
"info": {
"id": "driver",
"hostPort": "localhost:61103",
"isActive": true,
"rddBlocks": 0,
"memoryUsed": 0,
"diskUsed": 0,
"totalCores": 0,
"maxTasks": 0,
"activeTasks": 0,
"failedTasks": 0,
"completedTasks": 0,
"totalTasks": 0,
"totalDuration": 0,
"totalGCTime": 0,
"totalInputBytes": 0,
"totalShuffleRead": 0,
"totalShuffleWrite": 0,
"isBlacklisted": false,
"maxMemory": 278019440,
"addTime": 1430917380880,
"executorLogs": {},
"blacklistedInStages": [],
"peakMemoryMetrics"
}
}
```
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