<div dir="ltr"><div dir="ltr"><div dir="ltr"><div>You shouldn't have any cached "broken" tiles unless your source WMS is generating the white images (metatiles). I believe MapCache will generate a 404 and return a empty tile if configured. This may be the white tiles you are seeing. </div><div><br></div><div><div> <!-- errors</div><div> configure how error will be reported back to a client:</div><div> - log : no error is reported back, except an http error code.</div><div> - report : return the error message to the client in textual format</div><div> - empty_img : return an empty image to the client. the actual error code is in the X-Mapcache-Error http header</div><div> - report_img : return an image with the error text included inside. not implemented yet.</div><div> the default setting is to report the error message back to the user. In production, you might want to set this to "log"</div><div> if you're paranoid, or to "empty_img" if you want to play nice with non-conforming clients.</div><div> --></div><div> <errors>report</errors></div></div><div><br></div><div>It can be very difficult to locate and clean up tiles from a cache, the easiest method and in some cases the fastest is simply to create a new cache and delete the old one. One alternative is to use the mapcache_seed command line tool to either -f force the creation of new tiles or use the -mode delete option to delete the tiles from the cache. BTW you can use a polygon (shapefile) with mapcache_seed to only update / delete the desired area using the -d flag. </div><div><br></div><div>Also if you are using a disk cache you might be using symlinks which will allow mapcache to "reuse" blank tiles. If this is the case you might need to find / delete the symlinks rather than a "file"</div><div><br></div><div><div><cache name="disk" type="disk"></div><div> <!-- base<br></div><div> Absolute filesystem path where the tile structure will be stored.<br></div><div> This directory needs to be readable and writable by the user running<br></div><div> Apache.</div><div> --></div><div> <base>/tmp</base></div><div> <!-- symlink_blank<br></div><div><b> Enable blank (i.e. uniform color) tile detection. Blank tiles will be<br></b></div><div><b> detected at creation time and linked to a single blank tile on disk</b></div><div><b> to preserve disk space.</b></div><div> --></div><div> <symlink_blank/></div><div></cache></div></div><div><br></div><div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, 19 Feb 2019 at 16:47, Mark Volz <<a href="mailto:MarkVolz@co.lyon.mn.us">MarkVolz@co.lyon.mn.us</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal">Hello,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">On my webmap I noticed a few broken (white) tiles in a single area from my mapcache server. I would like to know the best way to find broken tiles in my mapcache service.
<u></u><u></u></p>
<p class="gmail-m_-3411408627808268408MsoListParagraph"><u></u><span style="font-family:Symbol"><span>·<span style="font:7pt "Times New Roman"">
</span></span></span><u></u>Initially I was concerned that I would need to the tile number and folder location by using the BBOX, WIDTH, and TILE RESOLUTION from the request. However, I figured out using the mapcache demo is easier to work with /mapcache/demo/<u></u><u></u></p>
<p class="gmail-m_-3411408627808268408MsoListParagraph"><u></u><span style="font-family:Symbol"><span>·<span style="font:7pt "Times New Roman"">
</span></span></span><u></u>Would it be better just to delete any tile that is 1K or smaller? These problibly are tiles that are broken, or intended to be blank in the first place.
<u></u><u></u></p>
<p class="gmail-m_-3411408627808268408MsoListParagraph"><u></u><span style="font-family:Symbol"><span>·<span style="font:7pt "Times New Roman"">
</span></span></span><u></u>What do others do to validate that the mapcache tiles have been built appropriately?<u></u><u></u></p>
<p class="MsoNormal">Thanks!<u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(31,73,125)">Sincerely,<u></u><u></u></span></p>
<p class="MsoNormal"><b><span style="color:rgb(31,73,125)">Mark Volz, GISP</span></b><b><span style="font-size:12pt;color:rgb(31,73,125)"><u></u><u></u></span></b></p>
<p class="MsoNormal"><b><span style="color:rgb(31,73,125)">Lyon County GIS Coordinator<u></u><u></u></span></b></p>
<p class="MsoNormal"><u></u> <u></u></p>
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