osm2pgsql 0.88.1 has been released with some backported fixes. The main
one was a condition where duplicate objects could appear in tables when
doing multi-threaded updates and events happened in precisely the right
order in the diff and the threads executed PostgreSQL commands for the
same object at the same time.
Even in a reduced testcase designed to trigger this behavior, it still
didn't happen all the time. The bug was present from approximately
0.87.0 to 0.88.0.
As a side effect of the bug-fix, osm2pgsql should do substantially less
work for complex multipolygons modified multiple times in one diff.
The other fixes are a compiler error fix and updates to the
documentation to account for planet size growth.
Updating from 0.86.0 or earlier to 0.88.1 is strongly recommended. There
are bugs in 0.86.0 which have been fixed in the last year of development.
If you are using a version before 0.84.0, please, please, upgrade.
https://github.com/openstreetmap/osm2pgsql/issues/67 has been fixed for
two years, but it is still encountered in the wild.
I am seeking input from developers experienced with with cmake and
Windows for https://github.com/openstreetmap/osm2pgsql/issues/417, for
some estimate of the difficulty involved.
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