Symptom

Opening a view that is expected to contain a large topology results in an error and the /opt/stackstate/var/log/stackstate.log log shows an exception similar to:

... Starting ViewEventSummaryStream web socket stream failed.
com.stackvista.graph.hbase.StackHBaseException: Error while accessing HBase
...
Caused by: java.io.InterruptedIOException: Origin: InterruptedException

Cause

Topology elements that are not cached are not fully retrieved from StackGraph within a certain period of time before a timeout, InterruptedException, is triggered.

Possible solution

Increase the cache size by editing StackState's configuration.

In /opt/stackstate/etc/application_stackstate.conf add the following configuration stackgraph.vertex.cache.size = <size> where <size> is the number of Graph vertices. An initial cache size can be obtained by adding:

The default cache size is set to 8191. Make sure the cache size is defined as a power of two minus one, e.g. 2^13-1 = 8191.

Make sure that StackState has enough memory available, the available memory can be configured by editing: /opt/stackstate/etc/processmanager/processmanager.conf. Under process named stackstate-server, change -Xmx1G to -Xmx<N>G where <N> is the number of desired GBs of memory. For example, change the setting to -Xmx8G to have 8 GBs of memory available to StackState.

Restart StackState, by sudo systemctl restart stackstate.service, for the changes to be effective.