Worker does not report loaded network to broker

[abyrd]

On analysis.conveyal.com, switching into analysis mode on a project using R5 v2.3.0. The worker completes pre-building the network and sits idle. The frontend says it's still waiting for the cluster to start up. The broker sees the worker, but does not associate it with any network or scenario IDs. Perhaps the worker is not sending them:

{
  "workerId": "59545a26fe874f35b6cb69a200e1a0ec",
  "architecture": "amd64",
  "processors": 4,
  "loadAverage": 0,
  "osName": "Linux",
  "osVersion": "4.9.17-8.31.amzn1.x86_64",
  "memoryMax": 7151288320,
  "memoryTotal": 3699900416,
  "memoryFree": 1084794592,
  "workerName": "R5",
  "workerVersion": "v2.3.0",
  "networks": [],
  "scenarios": [],
  "tasksPerMinute": 0,
  "ec2region": "eu-west-1",
  "ec2instanceId": "i-0ec8fa20a299bd1e4",
  "ec2instanceType": "r3.xlarge",
  "ec2machineImage": "ami-e5083683",
  "jvmStartTime": 1498795189,
  "jvmUptime": 2047,
  "jvmName": "OpenJDK 64-Bit Server VM",
  "jvmVendor": "Oracle Corporation",
  "jvmVersion": "25.131-b11",
  "seenSecondsAgo": 7
}

[abyrd]

@mattwigway have you run into this issue with recent workers? I'm wondering if this is happening on all networks or there's something specific about this Swiss network. When the worker reports to the broker, the networks and scenarios fields are zero-length arrays.

[abyrd]

I now suspect this is because the network is never being fully built:

06:04:43
[main] WARN com.conveyal.r5.labeling.LevelOfTrafficStressLabeler - Unable to parse maxspeed tag FR:urban
06:04:43
[main] WARN com.conveyal.r5.labeling.LevelOfTrafficStressLabeler - Unable to parse maxspeed tag AT:urban
06:04:43
[main] WARN com.conveyal.r5.labeling.LevelOfTrafficStressLabeler - Unable to parse maxspeed tag AT:urban
06:04:43
[main] WARN com.conveyal.r5.labeling.LevelOfTrafficStressLabeler - Unable to parse maxspeed tag AT:urban
06:04:43
[main] WARN com.conveyal.r5.labeling.LevelOfTrafficStressLabeler - Unable to parse maxspeed tag AT:urban
06:04:43
[main] INFO com.conveyal.r5.analyst.cluster.AnalystWorker - Done pre-loading network 77cc368d631747b9a64fa2ebc6e2cbe4

Note that it goes straight from reporting problems with the maxspeed tags to saying it's done pre-loading the network. That shouldn't happen.

[abyrd]

There is in fact no problem with reporting loaded networks. The cache was silently consuming an exception and returning null, so there were in fact no networks loaded. See #301