Summary:
When format_version is high enough to support user-key and
there are index entries for same user key that spans multiple data
blocks then it changes from user-key mode to internal-key mode. But the
flush policy is not reset to point to Block Builder of internal-keys.
After this switch, no entries are added to user key index partition
result, thus it never triggers flushing the block.
Fix: 1. After adding the entry in sub_builder_index_, if there is a switch
from user-key to internal-key, then flush policy is updated to point to
Block Builder of internal-keys index partition.
2. Set sub_builder_index_->seperator_is_key_plus_seq_ = true if
seperator_is_key_plus_seq_ is set to true so that subsequent partitions
can also use internal key mode.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7096
Test Plan: make check -j64
Reviewed By: ajkr
Differential Revision: D22416598
Pulled By: akankshamahajan15
fbshipit-source-id: 01fc2dc07ea1b32f8fb803995ebe6e9a3fbe67ac
54f171fe90