GeoServer hangs because multi-threaded loader is null
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Key: GEOS-4371
URL: http://jira.codehaus.org/browse/GEOS-4371
Project: GeoServer
Issue Type: Bug
Components: Global
Affects Versions: 2.1-RC1
Environment: CentOS 5.5, JDK 1.6 64-bit, GeoServer 2.1RC1
Reporter: Felix LJ Mayer
Assignee: Andrea Aime
We observed that GeoServer seems to hang. I connected with the debugger and
found threads were indeed blocked at line 420 of
org.geotools.gce.imagemosaic.RasterLayerResponse.MosaicBuilder.produce() where
java.util.concurrent.Future.get() is called. Method Future.get() does not
return because java.util.concurrent.FutureTask.run() was never called. This is
happening because while the flag
org.geotools.gce.imagemosaic.RasterLayerResponse.multithreadingAllowed is true,
the org.geotools.gce.imagemosaic.ImageMosaicReader.multiThreadedLoader is null.
Therefore in
org.geotools.gce.imagemosaic.RasterLayerResponse.MosaicBuilder.visit(GranuleDescriptor,
Object) the FutureTask is simply added to
org.geotools.gce.imagemosaic.RasterLayerResponse.MosaicBuilder.tasks, but not
executed because the 'if' statement in MosaicBuilder.produce() ignores the fact
that the ImageMosaicReader.multiThreadedLoader is null.
Note that GeoServer was running in the default configuration and the web
interface did show valid Thread Pool Executor Settings in the Coverage Access
Settings. It seems that somehow those settings are not propagated to the
ImageMosaicReader.
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