merge tool expects regions all have different sequence ids
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Key: HBASE-1212
URL: https://issues.apache.org/jira/browse/HBASE-1212
Project: Hadoop HBase
Issue Type: Bug
Reporter: stack
Currently merging two regions, the merge tool will compare their sequence ids.
If same, it will decrement one. It needs to do this because on region open,
files are keyed by their sequenceid; if two the same, one will erase the other.
Well, with the move to the aggregating hfile format, the sequenceid is written
when the file is created and its no longer written into an aside file but as
metadata on to the end of the file. Changing the sequenceid is no longer an
option.
This issue is about figuring a solution for the rare case where two store files
have same sequence id AND we want to merge the two regions.
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