[#1608][part-6] improvement(spark): verify the sent blocks count #1690
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What changes were proposed in this pull request?
Verify the sent blocks count in write tasks for spark
Why are the changes needed?
For #1608.
After introducing the reassign menchanism, the blocks' stored location will be dynamiclly changed.
To ensure possible or potenial bugs, it's necessary to introduce the block count.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Existing tests are enough to ensure safe