HBASE-11094, it seems that we changed the constructor we are using for SplitLogManager, which does not archive the log files after splitting is done to the archive folder. The log files stays in the splitting directory forever and re-split every time the master restarts.
It is surprising that our unit tests are passing (since 0.94.4) without any issues. Part of the reason is that the split is actually carried, but the WAL is not moved and thus the -splitting directory never gets deleted.
It seems critical to fix in 0.98.6, Andrew Purtell FYI.