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[geomesa-users] Accumulo tablet-servers dying when accessing table via GeoServer using GeoMesa Plugin

Our web-application uses GoogleEarth technology and has the ability to request from Accumulo (via GeoServer using the GeoMesa Accumulo plugin) geospatial feature-data that has been ingested using GeoMesa. Once a user has zoomed into a particular area of the map, the web-application uses AJAX to issue an HTTP request (such as the following) in order to bring back meta-data (in this case for “Full-Motion-Videos”) for any “features” that lie within the visible map area:

 

http://SERVER:8080/geoserver/geomesa/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=geomesa:fmv&outputFormat=application/json

 

Our web-application (asynchronously) submits such URL requests using AJAX. The problem is that the request USUALLY (though not always) fails and “hangs” with the side-effect that the Accumulo Table-Server process will have terminated (possibly due to a memory-compaction error). At this point it is not possible to access Accumulo via GeoServer/GeoMesa-Plugin until the Zookeeper/Hadoop/Accumulo/GeoServer stack is restarted.

 

However, if I manually send this request to GeoServer using the following wget(1) command, everything works fine:

 

wget -t 1 -O /tmp/gs-fmv.json http://SERVER:8080/geoserver/geomesa/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=geomesa:fmv&outputFormat=application/json

 

I seem to be able to submit such requests at any frequency, even submitting multiple concurrent requests, and experience no such problems with the Accumulo Tablet Servers dying.

 

At this point, we’re stymied as to what might be happening and hoped that perhaps one of you had seen some similar behavior or might have a theory about what is happening, or even suggestions about how to debug this.

 

FYI, we have been running the following software versions in our “data-stack” since our work with GeoMesa/Accumulo technology began April/May 2014:

 

accumulo-1.5.1

geomesa 1.0.0

geoserver-2.5

/webapps/geoserver/WEB-INF/lib/geomesa-plugin-1.0.0-SNAPSHOT-geoserver-plugin.jar

/webapps/geoserver/WEB-INF/lib/geomesa-core-1.0.0-SNAPSHOT.jar

hadoop-2.4.0

zookeeper-3.4.6

 

We would appreciate any help or insight you might be able to provide.

 

Bob Barnhart

Chief Systems Engineer | 858 826 5596 (Office) | 619 972 9489 (Mobile) | Robert.M.Barnhart@xxxxxxxxxx

 

 

 

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