Package org.apache.cassandra.db.context.CounterContext

Examples of org.apache.cassandra.db.context.CounterContext.ContextState

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        // Check that corrupted context created prior to #2968 are fixed by removeOldShards
        NodeId id1 = NodeId.getLocalId();
        NodeId.renewLocalId();
        NodeId id2 = NodeId.getLocalId();

        ContextState state = ContextState.allocate(3, 2);
        state.writeElement(NodeId.fromInt(1), 1, 4, false);
        state.writeElement(id1, 3, 2, true);
        state.writeElement(id2, -100, 5, true); // corrupted!

        assert ctx.total(state.context) == 11;

        try
        {
            ByteBuffer merger = ctx.computeOldShardMerger(state.context, Collections.<NodeId.NodeIdRecord>emptyList(), 0);
            ctx.removeOldShards(ctx.merge(state.context, merger), now);
            fail("RemoveOldShards should throw an exception if the current id is non-sensical");
        }
        catch (RuntimeException e) {}

        NodeId.renewLocalId();
        ByteBuffer merger = ctx.computeOldShardMerger(state.context, Collections.<NodeId.NodeIdRecord>emptyList(), 0);
        ByteBuffer cleaned = ctx.removeOldShards(ctx.merge(state.context, merger), now);
        assert ctx.total(cleaned) == 11;

        // Check it is not corrupted anymore
        ContextState state2 = new ContextState(cleaned);
        while (state2.hasRemaining())
        {
            assert state2.getClock() >= 0 || state2.getCount() == 0;
            state2.moveToNext();
        }

        // Check that if we merge old and clean on another node, we keep the right count
        ByteBuffer onRemote = ctx.merge(ctx.clearAllDelta(state.context), ctx.clearAllDelta(cleaned));
        assert ctx.total(onRemote) == 11;
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    }

    @Test
    public void testDiff()
    {
        ContextState left = ContextState.allocate(3, 0);
        ContextState right;

        // equality: equal nodes, all counts same
        left.writeElement(NodeId.fromInt(3), 3L, 0L);
        left.writeElement(NodeId.fromInt(6), 2L, 0L);
        left.writeElement(NodeId.fromInt(9), 1L, 0L);
        right = new ContextState(ByteBufferUtil.clone(left.context), left.headerLength);

        assert ContextRelationship.EQUAL ==
            cc.diff(left.context, right.context);

        // greater than: left has superset of nodes (counts equal)
        left = ContextState.allocate(4, 0);
        left.writeElement(NodeId.fromInt(3),  3L, 0L);
        left.writeElement(NodeId.fromInt(6),  2L, 0L);
        left.writeElement(NodeId.fromInt(9),  1L, 0L);
        left.writeElement(NodeId.fromInt(12), 0L, 0L);

        right = ContextState.allocate(3, 0);
        right.writeElement(NodeId.fromInt(3), 3L, 0L);
        right.writeElement(NodeId.fromInt(6), 2L, 0L);
        right.writeElement(NodeId.fromInt(9), 1L, 0L);

        assert ContextRelationship.GREATER_THAN ==
            cc.diff(left.context, right.context);
       
        // less than: left has subset of nodes (counts equal)
        left = ContextState.allocate(3, 0);
        left.writeElement(NodeId.fromInt(3), 3L, 0L);
        left.writeElement(NodeId.fromInt(6), 2L, 0L);
        left.writeElement(NodeId.fromInt(9), 1L, 0L);

        right = ContextState.allocate(4, 0);
        right.writeElement(NodeId.fromInt(3),  3L, 0L);
        right.writeElement(NodeId.fromInt(6),  2L, 0L);
        right.writeElement(NodeId.fromInt(9),  1L, 0L);
        right.writeElement(NodeId.fromInt(12), 0L, 0L);

        assert ContextRelationship.LESS_THAN ==
            cc.diff(left.context, right.context);

        // greater than: equal nodes, but left has higher counts
        left = ContextState.allocate(3, 0);
        left.writeElement(NodeId.fromInt(3), 3L, 0L);
        left.writeElement(NodeId.fromInt(6), 2L, 0L);
        left.writeElement(NodeId.fromInt(9), 3L, 0L);

        right = ContextState.allocate(3, 0);
        right.writeElement(NodeId.fromInt(3), 3L, 0L);
        right.writeElement(NodeId.fromInt(6), 2L, 0L);
        right.writeElement(NodeId.fromInt(9), 1L, 0L);

        assert ContextRelationship.GREATER_THAN ==
            cc.diff(left.context, right.context);

        // less than: equal nodes, but right has higher counts
        left = ContextState.allocate(3, 0);
        left.writeElement(NodeId.fromInt(3), 3L, 0L);
        left.writeElement(NodeId.fromInt(6), 2L, 0L);
        left.writeElement(NodeId.fromInt(9), 3L, 0L);

        right = ContextState.allocate(3, 0);
        right.writeElement(NodeId.fromInt(3), 3L, 0L);
        right.writeElement(NodeId.fromInt(6), 9L, 0L);
        right.writeElement(NodeId.fromInt(9), 3L, 0L);

        assert ContextRelationship.LESS_THAN ==
            cc.diff(left.context, right.context);

        // disjoint: right and left have disjoint node sets
        left = ContextState.allocate(3, 0);
        left.writeElement(NodeId.fromInt(3), 1L, 0L);
        left.writeElement(NodeId.fromInt(4), 1L, 0L);
        left.writeElement(NodeId.fromInt(9), 1L, 0L);

        right = ContextState.allocate(3, 0);
        right.writeElement(NodeId.fromInt(3), 1L, 0L);
        right.writeElement(NodeId.fromInt(6), 1L, 0L);
        right.writeElement(NodeId.fromInt(9), 1L, 0L);

        assert ContextRelationship.DISJOINT ==
            cc.diff(left.context, right.context);

        left = ContextState.allocate(3, 0);
        left.writeElement(NodeId.fromInt(3), 1L, 0L);
        left.writeElement(NodeId.fromInt(4), 1L, 0L);
        left.writeElement(NodeId.fromInt(9), 1L, 0L);

        right = ContextState.allocate(3, 0);
        right.writeElement(NodeId.fromInt(2),  1L, 0L);
        right.writeElement(NodeId.fromInt(6),  1L, 0L);
        right.writeElement(NodeId.fromInt(12), 1L, 0L);

        assert ContextRelationship.DISJOINT ==
            cc.diff(left.context, right.context);

        // disjoint: equal nodes, but right and left have higher counts in differing nodes
        left = ContextState.allocate(3, 0);
        left.writeElement(NodeId.fromInt(3), 1L, 0L);
        left.writeElement(NodeId.fromInt(6), 3L, 0L);
        left.writeElement(NodeId.fromInt(9), 1L, 0L);

        right = ContextState.allocate(3, 0);
        right.writeElement(NodeId.fromInt(3), 1L, 0L);
        right.writeElement(NodeId.fromInt(6), 1L, 0L);
        right.writeElement(NodeId.fromInt(9), 5L, 0L);

        assert ContextRelationship.DISJOINT ==
            cc.diff(left.context, right.context);

        left = ContextState.allocate(3, 0);
        left.writeElement(NodeId.fromInt(3), 2L, 0L);
        left.writeElement(NodeId.fromInt(6), 3L, 0L);
        left.writeElement(NodeId.fromInt(9), 1L, 0L);

        right = ContextState.allocate(3, 0);
        right.writeElement(NodeId.fromInt(3), 1L, 0L);
        right.writeElement(NodeId.fromInt(6), 9L, 0L);
        right.writeElement(NodeId.fromInt(9), 5L, 0L);

        assert ContextRelationship.DISJOINT ==
            cc.diff(left.context, right.context);

        // disjoint: left has more nodes, but lower counts
        left = ContextState.allocate(4, 0);
        left.writeElement(NodeId.fromInt(3),  2L, 0L);
        left.writeElement(NodeId.fromInt(6),  3L, 0L);
        left.writeElement(NodeId.fromInt(9),  1L, 0L);
        left.writeElement(NodeId.fromInt(12), 1L, 0L);

        right = ContextState.allocate(3, 0);
        right.writeElement(NodeId.fromInt(3), 4L, 0L);
        right.writeElement(NodeId.fromInt(6), 9L, 0L);
        right.writeElement(NodeId.fromInt(9), 5L, 0L);

        assert ContextRelationship.DISJOINT ==
            cc.diff(left.context, right.context);
       
        // disjoint: left has less nodes, but higher counts
        left = ContextState.allocate(3, 0);
        left.writeElement(NodeId.fromInt(3), 5L, 0L);
        left.writeElement(NodeId.fromInt(6), 3L, 0L);
        left.writeElement(NodeId.fromInt(9), 2L, 0L);

        right = ContextState.allocate(4, 0);
        right.writeElement(NodeId.fromInt(3),  4L, 0L);
        right.writeElement(NodeId.fromInt(6),  3L, 0L);
        right.writeElement(NodeId.fromInt(9),  2L, 0L);
        right.writeElement(NodeId.fromInt(12), 1L, 0L);

        assert ContextRelationship.DISJOINT ==
            cc.diff(left.context, right.context);

        // disjoint: mixed nodes and counts
        left = ContextState.allocate(3, 0);
        left.writeElement(NodeId.fromInt(3), 5L, 0L);
        left.writeElement(NodeId.fromInt(6), 2L, 0L);
        left.writeElement(NodeId.fromInt(9), 2L, 0L);

        right = ContextState.allocate(4, 0);
        right.writeElement(NodeId.fromInt(3),  4L, 0L);
        right.writeElement(NodeId.fromInt(6),  3L, 0L);
        right.writeElement(NodeId.fromInt(9),  2L, 0L);
        right.writeElement(NodeId.fromInt(12), 1L, 0L);

        assert ContextRelationship.DISJOINT ==
            cc.diff(left.context, right.context);

        left = ContextState.allocate(4, 0);
        left.writeElement(NodeId.fromInt(3), 5L, 0L);
        left.writeElement(NodeId.fromInt(6), 2L, 0L);
        left.writeElement(NodeId.fromInt(7), 2L, 0L);
        left.writeElement(NodeId.fromInt(9), 2L, 0L);

        right = ContextState.allocate(3, 0);
        right.writeElement(NodeId.fromInt(3), 4L, 0L);
        right.writeElement(NodeId.fromInt(6), 3L, 0L);
        right.writeElement(NodeId.fromInt(9), 2L, 0L);

        assert ContextRelationship.DISJOINT ==
            cc.diff(left.context, right.context);
    }
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    @Test
    public void testMerge()
    {
        // note: local counts aggregated; remote counts are reconciled (i.e. take max)
        ContextState left = ContextState.allocate(4, 1);
        left.writeElement(NodeId.fromInt(1), 1L, 1L);
        left.writeElement(NodeId.fromInt(2), 2L, 2L);
        left.writeElement(NodeId.fromInt(4), 6L, 3L);
        left.writeElement(NodeId.getLocalId(), 7L, 3L, true);

        ContextState right = ContextState.allocate(3, 1);
        right.writeElement(NodeId.fromInt(4), 4L, 4L);
        right.writeElement(NodeId.fromInt(5), 5L, 5L);
        right.writeElement(NodeId.getLocalId(), 2L, 9L, true);

        ByteBuffer merged = cc.merge(left.context, right.context);
        int hd = 4;

        assertEquals(hd + 5 * stepLength, merged.remaining());
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    }

    @Test
    public void testTotal()
    {
        ContextState left = ContextState.allocate(4, 1);
        left.writeElement(NodeId.fromInt(1), 1L, 1L);
        left.writeElement(NodeId.fromInt(2), 2L, 2L);
        left.writeElement(NodeId.fromInt(4), 3L, 3L);
        left.writeElement(NodeId.getLocalId(), 3L, 3L, true);

        ContextState right = ContextState.allocate(3, 1);
        right.writeElement(NodeId.fromInt(4), 4L, 4L);
        right.writeElement(NodeId.fromInt(5), 5L, 5L);
        right.writeElement(NodeId.getLocalId(), 9L, 9L, true);

        ByteBuffer merged = cc.merge(left.context, right.context);

        // 127.0.0.1: 12 (3+9)
        // 0.0.0.1:    1
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        NodeId id3 = NodeId.fromInt(3);
        List<NodeId.NodeIdRecord> records = new ArrayList<NodeId.NodeIdRecord>();
        records.add(new NodeId.NodeIdRecord(id1, 2L));
        records.add(new NodeId.NodeIdRecord(id3, 4L));

        ContextState ctx = ContextState.allocate(5, 3);
        ctx.writeElement(id1, 1L, 1L, true);
        ctx.writeElement(NodeId.fromInt(2), 2L, 2L);
        ctx.writeElement(id3, 3L, 3L, true);
        ctx.writeElement(NodeId.fromInt(4), 6L, 3L);
        ctx.writeElement(NodeId.fromInt(5), 7L, 3L, true);

        ByteBuffer merger = cc.computeOldShardMerger(ctx.context, records, Integer.MAX_VALUE);

        ContextState m = new ContextState(merger);

        assert m.getNodeId().equals(id1);
        assert m.getClock() <= -now;
        assert m.getCount() == -1L;
        assert m.isDelta();
        m.moveToNext();
        assert m.getNodeId().equals(id3);
        assert m.getClock() <= -now;
        assert m.getCount() == -3L;
        assert m.isDelta();
        m.moveToNext();
        assert m.getNodeId().equals(NodeId.getLocalId());
        assert m.getClock() == 1L;
        assert m.getCount() == 4L;
        assert m.isDelta();
        assert cc.total(ctx.context) == cc.total(cc.merge(ctx.context, merger));
    }
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        List<NodeId.NodeIdRecord> records = new ArrayList<NodeId.NodeIdRecord>();
        records.add(new NodeId.NodeIdRecord(id1, 2L));
        records.add(new NodeId.NodeIdRecord(id3, 4L));
        records.add(new NodeId.NodeIdRecord(id6, 10L));

        ContextState ctx = ContextState.allocate(6, 3);
        ctx.writeElement(id1, 1L, 1L, true);
        ctx.writeElement(NodeId.fromInt(2), 2L, 2L);
        ctx.writeElement(id3, 3L, 3L, true);
        ctx.writeElement(NodeId.fromInt(4), 6L, 3L);
        ctx.writeElement(NodeId.fromInt(5), 7L, 3L, true);
        ctx.writeElement(id6, 5L, 6L);

        ByteBuffer merger = cc.computeOldShardMerger(ctx.context, records, Integer.MAX_VALUE);
        ByteBuffer merged = cc.merge(ctx.context, merger);
        assert cc.total(ctx.context) == cc.total(merged);
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        List<NodeId.NodeIdRecord> records = new ArrayList<NodeId.NodeIdRecord>();
        records.add(new NodeId.NodeIdRecord(id1, 2L));
        records.add(new NodeId.NodeIdRecord(id3, 4L));
        records.add(new NodeId.NodeIdRecord(id6, 10L));

        ContextState ctx = ContextState.allocate(6, 3);
        ctx.writeElement(id1, 0L, 1L, true);
        ctx.writeElement(NodeId.fromInt(2), 0L, 2L);
        ctx.writeElement(id3, 0L, 3L, true);
        ctx.writeElement(NodeId.fromInt(4), 0L, 3L);
        ctx.writeElement(NodeId.fromInt(5), 0L, 3L, true);
        ctx.writeElement(id6, 0L, 6L);

        int timeFirstMerge = (int)(System.currentTimeMillis() / 1000);

        // First, only merge the first id
        ByteBuffer merger = cc.computeOldShardMerger(ctx.context, records, 3L);
        ByteBuffer merged = cc.merge(ctx.context, merger);
        assert cc.total(ctx.context) == cc.total(merged);

        try
        {
            Thread.sleep(2000);
        }
        catch (InterruptedException e)
        {
            throw new AssertionError();
        }

        // merge the second one
        ByteBuffer merger2 = cc.computeOldShardMerger(merged, records, 7L);
        ByteBuffer merged2 = cc.merge(merged, merger2);
        assert cc.total(ctx.context) == cc.total(merged2);

        ByteBuffer cleaned = cc.removeOldShards(merged2, timeFirstMerge + 1);
        assert cc.total(ctx.context) == cc.total(cleaned);
        assert cleaned.remaining() == ctx.context.remaining();

        // We should have cleaned id1 but not id3
        ContextState m = new ContextState(cleaned);
        m.moveToNext();
        assert m.getNodeId().equals(id3);

    }
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    }

    @Test
    public void testRemoveNotDeltaOldShards()
    {
        ContextState ctx = ContextState.allocate(4, 1);
        ctx.writeElement(NodeId.fromInt(1), 1L, 1L, true);
        ctx.writeElement(NodeId.fromInt(2), -System.currentTimeMillis(), 0L);
        ctx.writeElement(NodeId.fromInt(3), -System.currentTimeMillis(), 0L);
        ctx.writeElement(NodeId.fromInt(4), -System.currentTimeMillis(), 0L);

        ByteBuffer cleaned = cc.removeOldShards(ctx.context, (int)(System.currentTimeMillis() / 1000) + 1);
        assert cc.total(ctx.context) == cc.total(cleaned);
        assert cleaned.remaining() == ctx.context.remaining() - 3 * stepLength;
    }
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    }

    @Test
    public void testDiff()
    {
        ContextState left;
        ContextState right;

        CounterCell leftCell;
        CounterCell rightCell;

        // timestamp
        leftCell = BufferCounterCell.createLocal(cellname("x"), 0, 1L, Long.MIN_VALUE);
        rightCell = BufferCounterCell.createLocal(cellname("x"), 0, 2L, Long.MIN_VALUE);

        assert rightCell == leftCell.diff(rightCell);
        assert null      == rightCell.diff(leftCell);

        // timestampOfLastDelete
        leftCell = BufferCounterCell.createLocal(cellname("x"), 0, 1L, 1L);
        rightCell = BufferCounterCell.createLocal(cellname("x"), 0, 1L, 2L);

        assert rightCell == leftCell.diff(rightCell);
        assert null      == rightCell.diff(leftCell);

        // equality: equal nodes, all counts same
        left = ContextState.allocate(0, 0, 3);
        left.writeRemote(CounterId.fromInt(3), 3L, 0L);
        left.writeRemote(CounterId.fromInt(6), 2L, 0L);
        left.writeRemote(CounterId.fromInt(9), 1L, 0L);
        right = ContextState.wrap(ByteBufferUtil.clone(left.context));

        leftCell  = new BufferCounterCell(cellname("x"), left.context,  1L);
        rightCell = new BufferCounterCell(cellname("x"), right.context, 1L);
        assert leftCell.diff(rightCell) == null;

        // greater than: left has superset of nodes (counts equal)
        left = ContextState.allocate(0, 0, 4);
        left.writeRemote(CounterId.fromInt(3), 3L, 0L);
        left.writeRemote(CounterId.fromInt(6), 2L, 0L);
        left.writeRemote(CounterId.fromInt(9), 1L, 0L);
        left.writeRemote(CounterId.fromInt(12), 0L, 0L);

        right = ContextState.allocate(0, 0, 3);
        right.writeRemote(CounterId.fromInt(3), 3L, 0L);
        right.writeRemote(CounterId.fromInt(6), 2L, 0L);
        right.writeRemote(CounterId.fromInt(9), 1L, 0L);

        leftCell  = new BufferCounterCell(cellname("x"), left.context,  1L);
        rightCell = new BufferCounterCell(cellname("x"), right.context, 1L);
        assert leftCell.diff(rightCell) == null;

        // less than: right has subset of nodes (counts equal)
        assert leftCell == rightCell.diff(leftCell);

        // disjoint: right and left have disjoint node sets
        left = ContextState.allocate(0, 0, 3);
        left.writeRemote(CounterId.fromInt(3), 1L, 0L);
        left.writeRemote(CounterId.fromInt(4), 1L, 0L);
        left.writeRemote(CounterId.fromInt(9), 1L, 0L);

        right = ContextState.allocate(0, 0, 3);
        right.writeRemote(CounterId.fromInt(3), 1L, 0L);
        right.writeRemote(CounterId.fromInt(6), 1L, 0L);
        right.writeRemote(CounterId.fromInt(9), 1L, 0L);

        leftCell  = new BufferCounterCell(cellname("x"), left.context,  1L);
        rightCell = new BufferCounterCell(cellname("x"), right.context, 1L);
        assert rightCell == leftCell.diff(rightCell);
        assert leftCell  == rightCell.diff(leftCell);
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        runDiff(bumpedSlab());
    }

    private void runDiff(Allocator allocator)
    {
        ContextState left = ContextState.allocate(3, 0, allocator);
        ContextState right;

        // equality: equal nodes, all counts same
        left.writeElement(CounterId.fromInt(3), 3L, 0L);
        left.writeElement(CounterId.fromInt(6), 2L, 0L);
        left.writeElement(CounterId.fromInt(9), 1L, 0L);
        right = new ContextState(ByteBufferUtil.clone(left.context), left.headerLength);

        assert ContextRelationship.EQUAL ==
            cc.diff(left.context, right.context);

        // greater than: left has superset of nodes (counts equal)
        left = ContextState.allocate(4, 0, allocator);
        left.writeElement(CounterId.fromInt(3),  3L, 0L);
        left.writeElement(CounterId.fromInt(6),  2L, 0L);
        left.writeElement(CounterId.fromInt(9),  1L, 0L);
        left.writeElement(CounterId.fromInt(12), 0L, 0L);

        right = ContextState.allocate(3, 0, allocator);
        right.writeElement(CounterId.fromInt(3), 3L, 0L);
        right.writeElement(CounterId.fromInt(6), 2L, 0L);
        right.writeElement(CounterId.fromInt(9), 1L, 0L);

        assert ContextRelationship.GREATER_THAN ==
            cc.diff(left.context, right.context);

        // less than: left has subset of nodes (counts equal)
        left = ContextState.allocate(3, 0, allocator);
        left.writeElement(CounterId.fromInt(3), 3L, 0L);
        left.writeElement(CounterId.fromInt(6), 2L, 0L);
        left.writeElement(CounterId.fromInt(9), 1L, 0L);

        right = ContextState.allocate(4, 0, allocator);
        right.writeElement(CounterId.fromInt(3),  3L, 0L);
        right.writeElement(CounterId.fromInt(6),  2L, 0L);
        right.writeElement(CounterId.fromInt(9),  1L, 0L);
        right.writeElement(CounterId.fromInt(12), 0L, 0L);

        assert ContextRelationship.LESS_THAN ==
            cc.diff(left.context, right.context);

        // greater than: equal nodes, but left has higher counts
        left = ContextState.allocate(3, 0, allocator);
        left.writeElement(CounterId.fromInt(3), 3L, 0L);
        left.writeElement(CounterId.fromInt(6), 2L, 0L);
        left.writeElement(CounterId.fromInt(9), 3L, 0L);

        right = ContextState.allocate(3, 0, allocator);
        right.writeElement(CounterId.fromInt(3), 3L, 0L);
        right.writeElement(CounterId.fromInt(6), 2L, 0L);
        right.writeElement(CounterId.fromInt(9), 1L, 0L);

        assert ContextRelationship.GREATER_THAN ==
            cc.diff(left.context, right.context);

        // less than: equal nodes, but right has higher counts
        left = ContextState.allocate(3, 0, allocator);
        left.writeElement(CounterId.fromInt(3), 3L, 0L);
        left.writeElement(CounterId.fromInt(6), 2L, 0L);
        left.writeElement(CounterId.fromInt(9), 3L, 0L);

        right = ContextState.allocate(3, 0, allocator);
        right.writeElement(CounterId.fromInt(3), 3L, 0L);
        right.writeElement(CounterId.fromInt(6), 9L, 0L);
        right.writeElement(CounterId.fromInt(9), 3L, 0L);

        assert ContextRelationship.LESS_THAN ==
            cc.diff(left.context, right.context);

        // disjoint: right and left have disjoint node sets
        left = ContextState.allocate(3, 0, allocator);
        left.writeElement(CounterId.fromInt(3), 1L, 0L);
        left.writeElement(CounterId.fromInt(4), 1L, 0L);
        left.writeElement(CounterId.fromInt(9), 1L, 0L);

        right = ContextState.allocate(3, 0, allocator);
        right.writeElement(CounterId.fromInt(3), 1L, 0L);
        right.writeElement(CounterId.fromInt(6), 1L, 0L);
        right.writeElement(CounterId.fromInt(9), 1L, 0L);

        assert ContextRelationship.DISJOINT ==
            cc.diff(left.context, right.context);

        left = ContextState.allocate(3, 0, allocator);
        left.writeElement(CounterId.fromInt(3), 1L, 0L);
        left.writeElement(CounterId.fromInt(4), 1L, 0L);
        left.writeElement(CounterId.fromInt(9), 1L, 0L);

        right = ContextState.allocate(3, 0, allocator);
        right.writeElement(CounterId.fromInt(2),  1L, 0L);
        right.writeElement(CounterId.fromInt(6),  1L, 0L);
        right.writeElement(CounterId.fromInt(12), 1L, 0L);

        assert ContextRelationship.DISJOINT ==
            cc.diff(left.context, right.context);

        // disjoint: equal nodes, but right and left have higher counts in differing nodes
        left = ContextState.allocate(3, 0, allocator);
        left.writeElement(CounterId.fromInt(3), 1L, 0L);
        left.writeElement(CounterId.fromInt(6), 3L, 0L);
        left.writeElement(CounterId.fromInt(9), 1L, 0L);

        right = ContextState.allocate(3, 0, allocator);
        right.writeElement(CounterId.fromInt(3), 1L, 0L);
        right.writeElement(CounterId.fromInt(6), 1L, 0L);
        right.writeElement(CounterId.fromInt(9), 5L, 0L);

        assert ContextRelationship.DISJOINT ==
            cc.diff(left.context, right.context);

        left = ContextState.allocate(3, 0, allocator);
        left.writeElement(CounterId.fromInt(3), 2L, 0L);
        left.writeElement(CounterId.fromInt(6), 3L, 0L);
        left.writeElement(CounterId.fromInt(9), 1L, 0L);

        right = ContextState.allocate(3, 0, allocator);
        right.writeElement(CounterId.fromInt(3), 1L, 0L);
        right.writeElement(CounterId.fromInt(6), 9L, 0L);
        right.writeElement(CounterId.fromInt(9), 5L, 0L);

        assert ContextRelationship.DISJOINT ==
            cc.diff(left.context, right.context);

        // disjoint: left has more nodes, but lower counts
        left = ContextState.allocate(4, 0, allocator);
        left.writeElement(CounterId.fromInt(3),  2L, 0L);
        left.writeElement(CounterId.fromInt(6),  3L, 0L);
        left.writeElement(CounterId.fromInt(9),  1L, 0L);
        left.writeElement(CounterId.fromInt(12), 1L, 0L);

        right = ContextState.allocate(3, 0, allocator);
        right.writeElement(CounterId.fromInt(3), 4L, 0L);
        right.writeElement(CounterId.fromInt(6), 9L, 0L);
        right.writeElement(CounterId.fromInt(9), 5L, 0L);

        assert ContextRelationship.DISJOINT ==
            cc.diff(left.context, right.context);

        // disjoint: left has less nodes, but higher counts
        left = ContextState.allocate(3, 0, allocator);
        left.writeElement(CounterId.fromInt(3), 5L, 0L);
        left.writeElement(CounterId.fromInt(6), 3L, 0L);
        left.writeElement(CounterId.fromInt(9), 2L, 0L);

        right = ContextState.allocate(4, 0, allocator);
        right.writeElement(CounterId.fromInt(3),  4L, 0L);
        right.writeElement(CounterId.fromInt(6),  3L, 0L);
        right.writeElement(CounterId.fromInt(9),  2L, 0L);
        right.writeElement(CounterId.fromInt(12), 1L, 0L);

        assert ContextRelationship.DISJOINT ==
            cc.diff(left.context, right.context);

        // disjoint: mixed nodes and counts
        left = ContextState.allocate(3, 0, allocator);
        left.writeElement(CounterId.fromInt(3), 5L, 0L);
        left.writeElement(CounterId.fromInt(6), 2L, 0L);
        left.writeElement(CounterId.fromInt(9), 2L, 0L);

        right = ContextState.allocate(4, 0, allocator);
        right.writeElement(CounterId.fromInt(3),  4L, 0L);
        right.writeElement(CounterId.fromInt(6),  3L, 0L);
        right.writeElement(CounterId.fromInt(9),  2L, 0L);
        right.writeElement(CounterId.fromInt(12), 1L, 0L);

        assert ContextRelationship.DISJOINT ==
            cc.diff(left.context, right.context);

        left = ContextState.allocate(4, 0, allocator);
        left.writeElement(CounterId.fromInt(3), 5L, 0L);
        left.writeElement(CounterId.fromInt(6), 2L, 0L);
        left.writeElement(CounterId.fromInt(7), 2L, 0L);
        left.writeElement(CounterId.fromInt(9), 2L, 0L);

        right = ContextState.allocate(3, 0, allocator);
        right.writeElement(CounterId.fromInt(3), 4L, 0L);
        right.writeElement(CounterId.fromInt(6), 3L, 0L);
        right.writeElement(CounterId.fromInt(9), 2L, 0L);

        assert ContextRelationship.DISJOINT ==
            cc.diff(left.context, right.context);
    }
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