[Tile-serving] [openstreetmap/osm2pgsql] limit the number of buffers that are in the copy queue (#960)

[Sarah Hoffmann]

If PostgreSQL is much slower than the data processing, the queue can become very large and lead to out-of-memory errors.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/960

-- Commit Summary --

  * limit the number of buffers that are in the copy queue

-- File Changes --

    M db-copy.cpp (16)
    M db-copy.hpp (3)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/960.patch
https://github.com/openstreetmap/osm2pgsql/pull/960.diff

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