Re: [geomesa-users] Accumulo tablet-servers dying when accessing table v

[Chris Eichelberger <cne1x@xxxxxxxx>]

Bob,

I have not seen this type of behavior before, but I recommend reading
through the logs on one of the tablet-servers that fails.  

Out of curiosity, were there geographic, time, or attribute constraints
on your query that you left out for brevity in your note?

Best of luck!

Sincerely,
  -- Chris


On Thu, 2014-12-18 at 23:39 +0000, Barnhart, Bob M. wrote:
> 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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