Overpass API developpement

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Hello everyone.

For an application of mine I am trying to set up my own Overpass Api server.
Importing andorra-latest.osm.bz2 with the following command works fine, beside
~a dozen ways that are referenced in relations can't be found, which is
probably due to it being an extracted file and not the planet.osm file.

nohup ./srv/osm3s/bin/init_osm3s.sh /root/andorra-latest.osm.bz2 /srv/
osm3sdb /srv/osm3s

In hope of saving some space on the hard disk i created a file that contains
only the data that are necessary for my application, using osmfilter. The
command i used:

osmfilter D:\osm\germany-latest.osm --keep= --keep-ways="water= or waterway=
or natural= or leisure= or landuse= or landcover=" --keep-relations="water= or
natural= or leisure= or landuse= or landcover= or waterway=" -o=D:\osm
\germany-filtered.osm

Which reduced the file size down to about 20%. Afterwards i put it into a bz2
archiv using 7z.

using the same command that worked for Andorra, i get the following error:

Reading XML file ...terminate called after throwing an instance of
'std::bad_alloc'
  what():  std::bad_alloc
./srv/osm3s/bin/init_osm3s.sh: line 44: 15227 Broken pipe             bunzip2
< $PLANET_FILE
 15228 Aborted                 (core dumped) | $EXEC_DIR/bin/update_database
--db-dir=$DB_DIR/ $META $COMPRESSION

does anyone have an idea how to solve this? Is it even possible to import
osmfiltered files?