keith-turner opened a new issue, #3521:
URL: https://github.com/apache/accumulo/issues/3521
In #3513 a new iterator was added called SetEqualityIterator. This new
iterator is used by conditional mutations to check if a set stored in the
column qualifier is the same as expected before making an update. For example
it supports use cases like the following.
1. Read tablet metadata and see that it has file F1,F2,F3
2. Create a mutation that deletes files F2, F3 and adds F4
3. Add a condition to the mutation that the tablets current set of files
must be F1,F2,F3 inorder to make the update.
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