| Eclipse Data Partition Question [message #1061781] |
Mon, 03 June 2013 23:21  |
Eclipse User |
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Hi,
I download the eclipselink data partition example and I can run it successfully. But I have a few questions about it.
1. In the Customer class, I see two partition policy annotation applied:
@ReplicationPartitioning(name="Replicate", connectionPools={"default","node2"})
@HashPartitioning(name="HashPartitionById",
partitionColumn=@Column(name="ID"), connectionPools={"default","node2"})
I think these two policies looks like incompatible, and in practise, only HashPartitoning policy takes effect.
2. Suppose I would like to issue a query like this:
SELECT c FROM Customer c WHERE c.id < 10 ORDER BY c.id
The result are not globally sorted and only partial sorted by each partition.
Is there a way to use a merge sort algorithm to sort the merged result?
Best wishes,
Oliver
[Updated on: Mon, 03 June 2013 23:22] by Moderator |
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