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From "Feng Honghua (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-8721) fix for bug that delete can mask puts that happened after the delete was entered
Date Sun, 09 Jun 2013 09:56:20 GMT
Feng Honghua created HBASE-8721:

             Summary: fix for bug that delete can mask puts that happened after the delete
was entered
                 Key: HBASE-8721
                 URL: https://issues.apache.org/jira/browse/HBASE-8721
             Project: HBase
          Issue Type: Bug
          Components: regionserver
            Reporter: Feng Honghua

this fix aims for bug mentioned in http://hbase.apache.org/book.html

"Deletes mask puts, even puts that happened after the delete was entered. Remember that a
delete writes a tombstone, which only disappears after then next major compaction has run.
Suppose you do a delete of everything <= T. After this you do a new put with a timestamp
<= T. This put, even if it happened after the delete, will be masked by the delete tombstone.
Performing the put will not fail, but when you do a get you will notice the put did have no
effect. It will start working again after the major compaction has run. These issues should
not be a problem if you use always-increasing versions for new puts to a row. But they can
occur even if you do not care about time: just do delete and put immediately after each other,
and there is some chance they happen within the same millisecond."

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