If the WAL arrives at the pageserver slowly, it's possible that the
branch is created before all the data on the parent branch have
arrived. That results in a failure:
test_runner/batch_others/test_tenant_relocation.py:259: in test_tenant_relocation
timeline_id_second, current_lsn_second = populate_branch(pg_second, create_table=False, expected_sum=1001000)
test_runner/batch_others/test_tenant_relocation.py:133: in populate_branch
assert cur.fetchone() == (expected_sum, )
E assert (500500,) == (1001000,)
E At index 0 diff: 500500 != 1001000
E Full diff:
E - (1001000,)
E + (500500,)
To fix, specify the LSN to branch at, so that the pageserver will wait
for it arrive.
See https://github.com/neondatabase/neon/issues/2063
abff15dd7c