Here are problems and fixes related to using VMware Tanzu GemFire for VMs.
VMware Tanzu GemFire statistics and log files may be obtained by using the
gfsh export logs command.
See Export gfsh Logs for details.
You can visualize the performance of your cluster by downloading the statistics files from your servers. These files are located in the persistent store on each VM. To copy these files to your workstation, run the command:
bosh2 -e BOSH-ENVIRONMENT -d DEPLOYMENT-NAME scp server/0:/var/vcap/store/gemfire-server/statistics.gfs /tmp
bosh ssh to access Tanzu GemFire service instance server VMs
and directly obtain the VMware Tanzu GemFire logs that reside within the directory
See the VMware Tanzu GemFire Installing and Running VSD topic for information about loading the statistics files into VMware Tanzu GemFire VSD.
Thread dumps may be useful for debugging. Take at least three thread dumps on each VM, separating them by about one second.
To list your VMs, run:
bosh -e ENV -d DEPLOYMENT vms
Acquire the Deployment Name instructs how to acquire the string to substitute for
Use the VM in a
bosh sshcommand to ssh in to the Tanzu GemFire VM where you want to produce the thread dumps. Tanzu GemFire VMs can be referenced using a 0-based index, for example server/0, or locator/2:
bosh -e ENV -d DEPLOYMENT ssh server/0
Get into the Bosh Process Manager (bpm) shell by running
sudo /var/vcap/packages/bpm/bin/bpm shell JOB-NAME
where JOB-NAME is either
gemfire-locator, depending on which Tanzu GemFire VM you are on.
Find the process ID (PID) that is running the VMware Tanzu GemFire Java process by running
ps -aux | grep java
Typically, the PID is 1.
As you take multiple thread dumps, redirect the output of each to a uniquely named file. This example uses the file name
/var/vcap/packages/jdk8/bin/jcmd 1 Thread.print > /tmp/threaddump1.txt
/tmpwill be accessible on the VM in directory
Move the files to the
/tmpdirectory on the VM by running
mv /var/vcap/data/gemfire-server/tmp/threaddump1.txt /tmp/
mv /var/vcap/data/gemfire-locator/tmp/threaddump1.txt /tmp/
Files can be copied to your local machine using
bosh scpcommand. From your local machine, run:
bosh -d DEPLOYMENT scp VM:/tmp/threaddump1.txt .
$ bosh -d service-instance_1fd2850e-b754-4c5e-aa5c-ddb54ee301e6 scp server/0:/tmp/threaddump1.txt .
DEPLOYMENT name is needed in several troubleshooting procedures.
To acquire the
Use the Cloud Foundry CLI. Target the space where the service instance runs.
Discover the globally unique identifier (GUID) for the service instance:
cf service INSTANCE-NAME --guid
The output is the GUID. For example:
$ cf service dev-instance --guid 1fd2850e-b754-4c5e-aa5c-ddb54ee301e6
Prefix the GUID with the string
service-instance_to obtain the
DEPLOYMENTname. For the example GUID, the
Error message: “Creating p-cloudcache SERVICE-NAME failed”
Cause of the Problem: The smoke tests could not create an instance of GemFire.
Action: To troubleshoot why the deployment failed, use the CF CLI to create a new service instance using the same plan and download the logs of the service deployment from BOSH.
Error message: “Deleting SERVICE-NAME failed”
Cause of the Problem: The smoke test attempted to clean up a service instance it created and failed to delete the service using the
Action: Run BOSH
logsto view the logs on the broker or the service instance to see why the deletion may have failed.
Error message: “Cannot connect to the cluster SERVICE-NAME”
Cause of the Problem: The smoke test was unable to connect to the cluster.
Action: Review the logs of your load balancer, and review the logs of your CF Router to ensure the route to your Tanzu GemFire cluster is properly registered.
You also can create a service instance and try to connect to it using the gfsh CLI. This requires creating a service key.
Error message: “Could not perform create/put on locator LOCATOR-ADDRESS”
Cause of the Problem:
LOCATOR-ADDRESSis the BOSH DNS name of the locator. The smoke test was unable to write data to the cluster. The user may not have permissions to create a region or write data.
Problem: Client-to-server communication
Cause of the Problem: Tanzu GemFire clients communicate to Tanzu GemFire servers on port 40404 and with locators on port 55221. Both of these ports must be reachable from the VMware Tanzu Application Service for VMs network to service the network.
Problem: Membership port range
Cause of the Problem: Tanzu GemFire servers and locators communicate with each other using UDP and TCP. The current port range for this communication is
Solution: If you have a firewall between VMs, ensure this port range is open.
Problem: Port range usage across a WAN
Cause of the Problem: Gateway receivers and gateway senders communicate across WAN-separated service instances. Each Tanzu GemFire service instance uses VMware Tanzu GemFire defaults for the gateway receiver ports. The default is the inclusive range of port numbers 5000 to 5499.
Solution: Ensure this port range is open when WAN-separated service instances will communicate.
Problem: An error occurs when creating a service instance or when running a smoke test. The service creation issues an error message that starts with
Instance provisioning failed: There was a problem completing your request.
VMware Tanzu GemFire server logs at
/var/vcap/sys/log/gemfire-server/gemfire/server-<N>.logwill contain a disk-access error with the string
A DiskAccessException has occurred
and a stack trace similar to this one that begins with
org.apache.geode.cache.persistence.ConflictingPersistentDataException at org.apache.geode.internal.cache.persistence.PersistenceAdvisorImpl.checkMyStateOnMembers(PersistenceAdvisorImpl.java:743) at org.apache.geode.internal.cache.persistence.PersistenceAdvisorImpl.getInitialImageAdvice(PersistenceAdvisorImpl.java:819) at org.apache.geode.internal.cache.persistence.CreatePersistentRegionProcessor.getInitialImageAdvice(CreatePersistentRegionProcessor.java:52) at org.apache.geode.internal.cache.DistributedRegion.getInitialImageAndRecovery(DistributedRegion.java:1178) at org.apache.geode.internal.cache.DistributedRegion.initialize(DistributedRegion.java:1059) at org.apache.geode.internal.cache.GemFireCacheImpl.createVMRegion(GemFireCacheImpl.java:3089)
Cause of the Problem: The Tanzu GemFire VMs are underprovisioned; the quantity of disk space is too small.
Solution: Use Ops Manager to provision VMs of at least the minimum size. See Configure Service Plans for minimum-size details.