In WT-8003, this comment shows that a page with a single entry was created which is not supposed to happen when other pages with many entries exist. They should all have a similar number of entries

alexander.gorrod@mongodb.com pointed out in this comment we should have some code in reconciliation that should avoid creating a page with a single entry, see __rec_split_finish_process_prev.

The branch wt-8003-duplicate-cpp-test-repro-skewed can be used to reproduce the issue:

cmake -DCMAKE_TOOLCHAIN_FILE=../cmake/toolchains/mongodbtoolchain_v4_gcc.cmake -G Ninja ../. && ninja
cd test/cppsuite
./csuite_style_example_test  > out.txt // The last lines correspond to how many times a key is hit by the random cursor.
cd ../../
./wt -r -h test/cppsuite/WT_TEST_csuite_style_example_test -r verify -u -d dump_pages file:my_collection.wt > dump.txt

In the dump.txt file, you should observe the last row-store leaf containing one or a few values. They should be the most hit keys as shown in out.txt.