Hi, I want to confirm this before opening an JIRA issue.
An HRegion asks each HStore to flush its cache with a sequence number X. The assumption is that all the updates before X will be flushed. So during the startup reconstruction, the updates before X are skipped. However, the implementation does not guarantee that all the updates before X will be flushed when HStore flushes with X. This is because HRegion uses write-ahead logging and X is the latest sequence number. Some updates may not have been written to the cache which will be flushed. I'll open an JIRA issue once confirmed. Ning
