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GeoServer系列之五.WMS地图请求内存限制问题

2015-10-30 13:26 597 查看
应用需求:GeoServer发布WMS地图服务后,需要请求获取一张较大的地图图片,请求地址如下:

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http://localhost:8080/geoserver/wms?service=WMS&version=1.1.0&request=GetMap&layers=campus&styles=&
bbox=4.528514,4.950175,4.546676,4.958241

&width=7430&height=3300&srs=EPSG:4326&format=image/png

http://localhost:8080/geoserver/wms?service=WMS&version=1.1.0&request=GetMap&layers=campus&styles=&
bbox=4.528514,4.950175,4.546676,4.958241
&width=7430&height=3300&srs=EPSG:4326&format=image/png

其中,输出的地图图片的高、宽分别为:3300、7430。
问题一:在浏览器中地址栏中回车发送请求后,抛出以下异常,提示地图渲染超过了65536KB的大小限制:

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<pre name="code" class="html"><?xml version="1.0" encoding="UTF-8" standalone="no"?><!DOCTYPE ServiceExceptionReport SYSTEM

"http://localhost:8080/geoserver/schemas/wms/1.1.1/WMS_exception_1_1_1.dtd">

<ServiceExceptionReport version="1.1.1" >

<ServiceException>

Rendering request would use 71833KB, whilst the maximum memory allowed is 65536KB

</ServiceException>

</ServiceExceptionReport>

<pre name="code" class="html"><?xml version="1.0" encoding="UTF-8" standalone="no"?><!DOCTYPE ServiceExceptionReport SYSTEM
"http://localhost:8080/geoserver/schemas/wms/1.1.1/WMS_exception_1_1_1.dtd">
<ServiceExceptionReport version="1.1.1" >
<ServiceException>
Rendering request would use 71833KB, whilst the maximum memory allowed is 65536KB
</ServiceException>
</ServiceExceptionReport>

解决一:登录 GeoServer Web Admin Page 管理页面,在左侧的服务中,点击WMS,在右侧把Max rendering memory (KB)的值由65536改为了6553600以确保够用。重新请求即可成功。

问题二:当继续增加请求的图片大小时(高、宽:14860、6600),仍然会抛出异常,请求URL和异常信息如下:

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http://localhost:8080/geoserver/wms?service=WMS&version=1.1.0&request=GetMap&layers=campus&styles=&
bbox=4.528514,4.950175,4.546676,4.958241

&width=14860&height=6600&srs=EPSG:4326&format=image/png

http://localhost:8080/geoserver/wms?service=WMS&version=1.1.0&request=GetMap&layers=campus&styles=&
bbox=4.528514,4.950175,4.546676,4.958241
&width=14860&height=6600&srs=EPSG:4326&format=image/png


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<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<!DOCTYPE ServiceExceptionReport SYSTEM

"http://localhost:8080/geoserver/schemas/wms/1.1.1/WMS_exception_1_1_1.dtd">

<ServiceExceptionReport version="1.1.1" >

<ServiceException>

java.lang.NegativeArraySizeException

null

</ServiceException>

</ServiceExceptionReport>

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE ServiceExceptionReport SYSTEM
"http://localhost:8080/geoserver/schemas/wms/1.1.1/WMS_exception_1_1_1.dtd">
<ServiceExceptionReport version="1.1.1" >
<ServiceException>
java.lang.NegativeArraySizeException
null
</ServiceException>
</ServiceExceptionReport>


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<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<!DOCTYPE ServiceExceptionReport SYSTEM

"http://localhost:8080/geoserver/schemas/wms/1.1.1/WMS_exception_1_1_1.dtd">

<ServiceExceptionReport version="1.1.1" >

<ServiceException>

java.lang.OutOfMemoryError: Java heap space

Java heap space

</ServiceException>

</ServiceExceptionReport>

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE ServiceExceptionReport SYSTEM
"http://localhost:8080/geoserver/schemas/wms/1.1.1/WMS_exception_1_1_1.dtd">
<ServiceExceptionReport version="1.1.1" >
<ServiceException>
java.lang.OutOfMemoryError: Java heap space
Java heap space
</ServiceException>
</ServiceExceptionReport>

解决二:开始菜单 >> Start GeoServer 右键属性,找到 "C:\Program Files (x86)\GeoServer 2.5\bin\startup.bat" ,用记事本打开:

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call "C:\Program Files (x86)\Java\jdk1.8.0\bin\java.exe" -DGEOSERVER_DATA_DIR="C:\Program Files (x86)\GeoServer 2.5\data_dir" -Xmx512m -XX:MaxPermSize=128m -DSTOP.PORT=8079 -DSTOP.KEY=geoserver -Djetty.port=8080 -Djetty.logs="C:\Program Files (x86)\GeoServer 2.5\logs" -jar "C:\Program Files (x86)\GeoServer 2.5\start.jar"

call "C:\Program Files (x86)\Java\jdk1.8.0\bin\java.exe" -DGEOSERVER_DATA_DIR="C:\Program Files (x86)\GeoServer 2.5\data_dir" -Xmx512m -XX:MaxPermSize=128m -DSTOP.PORT=8079 -DSTOP.KEY=geoserver -Djetty.port=8080 -Djetty.logs="C:\Program Files (x86)\GeoServer 2.5\logs" -jar "C:\Program Files (x86)\GeoServer 2.5\start.jar"

修改其中的 -Xmx512m -XX:MaxPermSize=128m 部分,修改如下:

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call "C:\Program Files (x86)\Java\jdk1.8.0\bin\java.exe" -DGEOSERVER_DATA_DIR="C:\Program Files (x86)\GeoServer 2.5\data_dir" -Xmx1024m -XX:MaxPermSize=512m -DSTOP.PORT=8079 -DSTOP.KEY=geoserver -Djetty.port=8080 -Djetty.logs="C:\Program Files (x86)\GeoServer 2.5\logs" -jar "C:\Program Files (x86)\GeoServer 2.5\start.jar"

call "C:\Program Files (x86)\Java\jdk1.8.0\bin\java.exe" -DGEOSERVER_DATA_DIR="C:\Program Files (x86)\GeoServer 2.5\data_dir" -Xmx1024m -XX:MaxPermSize=512m -DSTOP.PORT=8079 -DSTOP.KEY=geoserver -Djetty.port=8080 -Djetty.logs="C:\Program Files (x86)\GeoServer 2.5\logs" -jar "C:\Program Files (x86)\GeoServer 2.5\start.jar"

再次请求地图URL,问题解决。

参考文章:

1. Maximum memory for GetMap request

2. WMS configuration

3. Geoserver/java out of heap space - how do I increase it?

注:经测试,WMS请求的图片大小似乎不能超过10M,原因不明。
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