Better Handling on Disk Full IOException

[Zottelchen]

Is your feature request related to a problem? Please describe. I've tried to render a giant map (uncompressed because my webhost only takes uncompressed files). It filled the disk (220 GB at ~50%). Then it only threw errors. All progress is lost, I think.

Individual file errors

[ERROR] Failed to save hires model: web/data/drehmal/hires/x-1/5/1/z-8/0.json
java.io.IOException: No such file or directory
      at java.base/java.io.UnixFileSystem.createFileExclusively(Native Method)
      at java.base/java.io.File.createNewFile(File.java:1027)
      at de.bluecolored.bluemap.core.render.hires.HiresModelManager.save(HiresModelManager.java:95)
      at de.bluecolored.bluemap.core.render.hires.HiresModelManager.save(HiresModelManager.java:86)
      at de.bluecolored.bluemap.core.render.hires.HiresModelManager.render(HiresModelManager.java:80)
      at de.bluecolored.bluemap.core.render.TileRenderer.render(TileRenderer.java:49)
      at de.bluecolored.bluemap.common.MapType.renderTile(MapType.java:70)
      at de.bluecolored.bluemap.common.RenderTicket.render(RenderTicket.java:42)
      at de.bluecolored.bluemap.common.RenderManager.renderThread(RenderManager.java:164)
      at java.base/java.lang.Thread.run(Thread.java:832)

And even more fatally it also failed to save the render-state.

Render-state file error

^C[INFO] Stopping render ...
[INFO] Saving tiles ...
[INFO] Saving render-state ...
[ERROR] Failed to save render-state!
java.io.IOException: No space left on device
        at java.base/java.io.FileOutputStream.writeBytes(Native Method)
        at java.base/java.io.FileOutputStream.write(FileOutputStream.java:347)
        at java.base/java.util.zip.DeflaterOutputStream.deflate(DeflaterOutputStream.java:252)
        at java.base/java.util.zip.DeflaterOutputStream.write(DeflaterOutputStream.java:210)
        at java.base/java.util.zip.GZIPOutputStream.write(GZIPOutputStream.java:145)
        at java.base/java.util.zip.DeflaterOutputStream.write(DeflaterOutputStream.java:187)
        at java.base/java.io.DataOutputStream.writeInt(DataOutputStream.java:196)
        at de.bluecolored.bluemap.common.RenderTask.write(RenderTask.java:180)
        at de.bluecolored.bluemap.common.RenderManager.writeState(RenderManager.java:241)
        at de.bluecolored.bluemap.cli.BlueMapCLI.lambda$renderMaps$0(BlueMapCLI.java:142)
        at java.base/java.lang.Thread.run(Thread.java:832)
        Suppressed: java.io.IOException: No space left on device
                at java.base/java.io.FileOutputStream.writeBytes(Native Method)
                at java.base/java.io.FileOutputStream.write(FileOutputStream.java:347)
                at java.base/java.util.zip.GZIPOutputStream.finish(GZIPOutputStream.java:168)
                at java.base/java.util.zip.DeflaterOutputStream.close(DeflaterOutputStream.java:237)
                at java.base/java.io.FilterOutputStream.close(FilterOutputStream.java:188)
                at de.bluecolored.bluemap.cli.BlueMapCLI.lambda$renderMaps$0(BlueMapCLI.java:145)
                ... 1 more
        Suppressed: java.io.IOException: No space left on device
                at java.base/java.io.FileOutputStream.writeBytes(Native Method)
                at java.base/java.io.FileOutputStream.write(FileOutputStream.java:347)
                at java.base/java.util.zip.GZIPOutputStream.finish(GZIPOutputStream.java:168)
                at java.base/java.util.zip.DeflaterOutputStream.close(DeflaterOutputStream.java:237)
                at de.bluecolored.bluemap.cli.BlueMapCLI.lambda$renderMaps$0(BlueMapCLI.java:145)
                ... 1 more

Describe the solution you'd like Check every now and then if there is still enough space and if not cleanly exit and save the render-state. (Also is there a way to recover from what I already have?)