move.md

Move

When a range is assigned to a node (a), and we want it to be assigned to a different node (b), we move it.

1. Prepare(b)
2. Deactivate(a)
3. Activate(b)
4. Drop(a)

TestMove

Failures

If step 1 fails, abort the move:

1. Prepare(b)

TestMoveFailure_Prepare

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If step 2 fails, do nothing. We are stuck until the source placement relinquishes the range:

1. Prepare(b)
2. Deactivate(a)

TestMoveFailure_Deactivate

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If step 3 fails, reactivate the source placement, drop the destination placement, and abort the move:

1. Prepare(b)
2. Deactivate(a)
3. Activate(b)
4. Activate(a)
5. Drop(b)

TestMoveFailure_Activate

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If step 4 fails, do nothing but keep trying forever:

1. Prepare(b)
2. Deactivate(a)
3. Activate(b)
4. Drop(a)

TestMoveFailure_Drop