[jira] [Created] (IGNITE-5184) Collect write behind batch with out of order

["Alexander Belyak (JIRA)" <ji...@apache.org>]

Alexander Belyak created IGNITE-5184:
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             Summary: Collect write behind batch with out of order
                 Key: IGNITE-5184
                 URL: https://issues.apache.org/jira/browse/IGNITE-5184
             Project: Ignite
          Issue Type: Improvement
            Reporter: Alexander Belyak


Now write behind flusher trying to batch cache operation with only natural order, i.e. if cache have "insert1, update2, delete3, insert4, delete5" operations it will be splitted to 4 batch opearations:
1) insert1, update2
2) delete3
3) insert4
4) delete5
Or even worse if we have two flush threads (they can get operation as:
1 thread: 1) insert1
2 thread: 1) update2
1 thread: 2) delete3
2 thread: 2) insert4
1 thread: 3) delete5
And we get 5 "batch" operation with store.
Because we already don't have real historical order in WB (with insert key1=1, delete key2, update key1=3 store wil get writeAll(key1=3) and then deleteAll(key2) operations) - it will be better if flusher thying to skip cache entries with different operation, i.e.process first example as:
1) insert1, update2, insert4 (skip delete3 and process it later)
2) delete3, delete5 (process delete3 operation)



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