Unable to read SingleFileStore at 'RHDG_HOME/server/data/migrate.dat'

Issue

• While using store migrator to migrate cache store from RHDG 8.0.0 to RHDG 8.3.1, getting below exception:

Unable to read SingleFileStore at '/home/aipatil/Downloads/Jboss_EAP_Binaries/redhat-datagrid-8.0.0-server/server/data/migrate.dat'

java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:498)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run (ExecJavaMojo.java:297)
at java.lang.Thread.run (Thread.java:748)
Caused by: org.infinispan.commons.CacheException: Unable to read SingleFileStore at '/home/aipatil/Downloads/Jboss_EAP_Binaries/redhat-datagrid-8.0.0-server/server/data/migrate.dat'

• StoreMigrator only supports source stores with a single .dat file. However, when segmentation is configured a .dat file is created per segment across many directories. The migrator should be able to handle such stores when the user configures the source.segment_count property.