geoserver – Resolving GeoWebCache Seeding Issues in GeoServer

geoservergeowebcache

I am using GeoServer 2.6 Final War File in Tomcat. I am setting up GeoWebCache and I am attempting to seed a table from Oracle that has about 600,000 records. (I used the Oracle NG provider to create the Data Source).
I select the following options from GeoServer under 

"Tile Layers" >> "Seed/Truncate" for that layer:
  • Number of tasks to use: 01
  • Type of operation: Seed – generate missing tiles
  • Grid Set: EPSG:2236
  • Format: image/png
  • Zoom start: 00
  • Zoom stop: 18

I then click on Submit and see the following:

Id|Layer   |Status |Type|Estimated # of tiles|Tiles completed|Time elapsed |Time remaining|Tasks     
49|sf:MV0_1|RUNNING|SEED|2,857,446           |-1             |Estimating...|Estimating... |(Task 1 of 1)

Then I click on "Refresh list" and in about 10 seconds it is no longer there…I was trying to look in the logs folder and found no logging in:

C:\Program Files\Apache Software Foundation\Tomcat 8.0\logs

which is where GeoServer is installed.

Why is the seeding not working?

Here is the gridset 2236 defined in geowebcache.xml:

<gridSet>
            <name>EPSG:2236</name>
            <srs><number>2236</number></srs>
            <extent>
                <coords>
                    <double>306826.6397</double>
                    <double>36279.6630</double>
                    <double>982215.8007</double>
                    <double>2363339.4629</double>
                </coords>
            </extent>
            <resolutions>
                <double>8192</double>
                <double>4096</double>
                <double>2048</double>
                <double>1024</double>
                <double>512</double>
                <double>256</double>
                <double>128</double>
                <double>64</double>
                <double>32</double>
                <double>16</double>
                <double>8</double>
                <double>4</double>
                <double>2</double>
                <double>1</double>
                <double>0.5</double>
                <double>0.25</double>
                <double>0.125</double>
                <double>0.0625</double>
                <double>0.03125</double>            
            </resolutions>
            <metersPerUnit>0.3048</metersPerUnit>
            <tileHeight>256</tileHeight>
            <tileWidth>256</tileWidth>
        </gridSet>

Answering a question from comments:

"Does the preview of the integrated GWC show maps for you?"

I click on "Tile Layers", Then select the "EPSG: 2236 / png" to preview the cached tile. I get some tiles that display. (Only the ones generated before the process dies as mentioned above)

Answering another question from comments:

"You need to make sure that your Gridset in GeoWebCache matches what
you have setup on the Layer in GeoServer."

Yes, the layer matches the gridset in GeoWebCache: 

Data>>Layers>>Edit Layer>>Tile Caching>>Available Gridsets

One item shows:

Available gridsets 
Gridset: EPSG:2236
Published zoom levels: min/max
Cached zoom levels: min/max
Grid subset bounds: Dynamic

Also under "Tile Caching">>"Caching Defaults">>Default Cached Gridsets, I have only:

Gridset: EPSG:2236 
CRS : EPSG:2236
Tile Dimensions: 256 x 256 
Zoom levels: 19
Disk Usage: 465.63 MB

Also under "Tile Caching">>"Disk Quota", disk quota is enabled and set to 1.953 GB.

Answering a question from comments:

"Do you have write permission for the logging folder?"

Yes, other log data is being updated in that folder such as :

C:\Program Files\Apache Software Foundation\Tomcat 8.0\logs

localhost*.log    
catalina*.log     
etc

Answering a question from comments:

"Browse the folder and see if the images are stored? I remember that Geoserver couldn't read my folder size once, so I didn't think the
images were cached but they were there when I browsed to the
directory. Perhaps this is similar?"

Yes, there are some images maybe a handful which are created just before the seed tasks die. They are in the

C:\Program Files\Apache Software Foundation\Tomcat8.0\webapps\geoserver\data\gwc\

folder under subfolders.

I also want to mention that there is another oracle spatial table (setup under another layer) with same layout but with only 1300 records and that one does complete normally.

I found the error in the geoserver.log that is causing the gwc to stop:

org.geoserver.platform.ServiceException: This requested used more time
than allowed and has been forcefully stopped. Max rendering time is
60.0s

Best Answer

I found the answer to the issue, although there is no available solution. It is a known bug where GeoWebCache stops forcefully. It looks like there is no current solution for bug # GEOS-6278:

https://osgeo-org.atlassian.net/browse/GEOS-6278

If a solution is available in the future for GeoWebCache, I will update this post.

Related Question