- Fusion run script failures
- Check the Java version
- Clear browser cache
- Stop/Clean up/Start
- Inspect the log files
- Troubleshoot a Windows Install
- Increase memory
- More Help and Support
This topic explains how to troubleshoot difficulties that occur when installing or upgrading Fusion.
Fusion run script failures
Common problems that cause Fusion run scripts to fail:
Wrong Java version
Users have insufficient privileges for the installation directory.
bindirectory not in the
Some Fusion services may already be running, or registered as running.
Roaming IP address; try uncommenting this line in
fusion.propertiesin Fusion 4.x):
default.address = 127.0.0.1
Check the Java version
Fusion scripts use the environment variable
To check the setting of this variable, log in to the account used to run Fusion, and check that this variable is set to the proper value.
On a linux, Mac, or other Unix system, use the following command:
On Windows, the command is:
Fusion scripts execute both the
To check the Java version invoked by these commands, run the following commands from a shell or terminal window:
java -version javac -version
Clear browser cache
If a previous version of Fusion was accessed in the browser with the same URL as that of the newly installed version of Fusion, then there may be old pages and/or cookies in the browser cache. A hard page refresh will clear old pages from the browser cache. If clearing the page cache doesn’t solve this problem, clear session cookies as well.
If the script
VAR-FUSIONPATH/bin/fusion start completes without reporting an error, but the
Fusion UI displays a message that it can’t find Collections or Datasources,
this may be due to Fusion services not being able to communicate properly (via ZooKeeper).
This can happen with developer deployments running on a laptop if the network connection
changes or is interrupted, especially when using the embedded ZooKeeper instance
that is bundled with Fusion.
In this situation, you should stop Fusion, inspect the system processes
and if necessary, manually terminate running processes and cleanup
to bring the system back to a clean state, then start Fusion once again.
Although the Fusion run script
bin/fusion provides a restart option,
the restart option assumes a correctly functioning system and can’t
always recover from system failure.
To stop Fusion:
Run the script
VAR-FUSIONPATH/bin/fusion with the argument
$ cd /path/to/VAR-FUSIONPATH $ ./bin/fusion stop Successfully stopped ui (process ID 41524) Successfully stopped connectors (process ID 41328) Successfully stopped api (process ID 41159) Successfully stopped solr (process ID 41153) Successfully stopped zookeeper (process ID 41151)
After stopping Fusion, you should make sure that no Fusion services are running.
When the Fusion scripts start a Fusion service, they record the process id in a
.pid file in the directory
For a Fusion instance that is up and running, we see the following set of
> find /path/to/VAR-FUSIONPATH/var -name "*.pid" -print fusion/var/api/api.pid fusion/var/connectors/connectors.pid fusion/var/solr/solr.pid fusion/var/spark-master/spark-master.pid fusion/var/spark-worker/spark-worker.pid fusion/var/ui/ui.pid fusion/var/zookeeper/zookeeper.pid
The above output shows the set of
.pid created by a single Fusion instance running with embedded ZooKeeper and Solr.
But if no Fusion services are running, there shouldn’t be any
In the case that all services have been stopped, but there are still some
.pid files found,
these files should be deleted before starting Fusion.
Inspect the log files
If none of the above help, inspect the Fusion log files in directory
If you experience unexpected termination when running Fusion, first look in the log files for clues.
One setting you can look into is in $FUSION_HOME/conf/fusion.cors:
pollingFailureCountThreshold is set to
1, so the Agent restarts all services the second time it fails to reach a service. Try a modest increase, for example set
Log file names that start with "oom" indicate out-of-memory problems.
You might need to increase the amount of memory allotted to that service.
The amount of memory allotted to each kind of Fusion service is controlled by
environment variables that are set in the
fusion.properties in Fusion 4.x) file.
Troubleshoot a Windows Install
Check common Windows service install script mistakes:
Is the account trying run the install script a poweruser/administrator of the server?
Is the DOMAIN\USERNAME correctly specified? Is the Domain correct?
javainstalled on the
%PATH%? To use a different Java, specify it in
Are there any obvious issues in
Does Fusion start from the normal
Are there any other errors in the normal logs?
One other thing that can happen if you haven’t changed any of the default settings is for the services to run out of memory under heavy load, causing the program to crash.
To find out if this happened, you can check for the presence of any files matching the pattern oom_killer-.log* in the log directory for the service that is being restarted, for example, $FUSION_HOME/var/log/connectors-classic if that is the one being restarted.
If this is your issue, the first step is to increase the memory of the affected component by modifying
fusion.properties in Fusion 4.x). Go to the
jvmOptions for the service in question and change the value of the
-Xmx flag. By default you will see something like:
connectors-classic.jvmOptions = -Xmx1g -Xss256k -Dcom.lucidworks.connectors.pipelines.embedded=false
-Xmx1g means this service will fail if it needs more than 1 gigabyte of memory to operate. Increase this memory, for example set the flag to
Xmx4g for an additional 3 gigabytes. 1g can be very low for some workloads.