hyracks/hyracks-storage-am-lsm-btree/src/main/java/org/apache/hyracks/storage/am/lsm/btree/impls/ExternalBTree.java [214:267]:
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    public void deleteTransactionComponent() throws HyracksDataException {
        fileManager.deleteTransactionFiles();
    }

    // This function in an instance of this index is only used after a bulk load
    // is successful
    @Override
    public void addComponent(ILSMComponent c) throws HyracksDataException {
        if (version == 0) {
            diskComponents.add(0, c);
        } else if (version == 1) {
            secondDiskComponents.add(0, c);
        }
    }

    // This function is used when a new component is to be committed.
    @Override
    public void commitTransactionDiskComponent(ILSMComponent newComponent) throws HyracksDataException {
        // determine which list is the new one and flip the pointer
        List<ILSMComponent> newerList;
        List<ILSMComponent> olderList;
        if (version == 0) {
            newerList = diskComponents;
            olderList = secondDiskComponents;
            version = 1;
        } else {
            newerList = secondDiskComponents;
            olderList = diskComponents;
            version = 0;
        }
        // Remove components from list
        olderList.clear();
        // Add components
        olderList.addAll(newerList);
        if (newComponent != null) {
            // Add it to the list
            olderList.add(0, newComponent);
        }
    }

    @Override
    public synchronized void activate() throws HyracksDataException {
        if (isActivated) {
            throw new HyracksDataException("Failed to activate the index since it is already activated.");
        }
        if (diskComponents.size() == 0 && secondDiskComponents.size() == 0) {
            //First time activation
            List<LSMComponentFileReferences> validFileReferences;
            try {
                validFileReferences = fileManager.cleanupAndGetValidFiles();
            } catch (IndexException e) {
                throw new HyracksDataException(e);
            }
            for (LSMComponentFileReferences lsmComonentFileReference : validFileReferences) {
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hyracks/hyracks-storage-am-lsm-rtree/src/main/java/org/apache/hyracks/storage/am/lsm/rtree/impls/ExternalRTree.java [159:215]:
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    public void deleteTransactionComponent() throws HyracksDataException {
        fileManager.deleteTransactionFiles();
    }

    // This function in an instance of this index is only used after a bulk load
    // is successful
    // it will therefore add the component to the first list and enter it.
    @Override
    public void addComponent(ILSMComponent c) throws HyracksDataException {
        if (version == 0) {
            diskComponents.add(0, c);
        } else if (version == 1) {
            secondDiskComponents.add(0, c);
        }
    }

    // This function is used when a new component is to be committed.
    @Override
    public void commitTransactionDiskComponent(ILSMComponent newComponent) throws HyracksDataException {

        // determine which list is the new one and flip the pointer
        List<ILSMComponent> newerList;
        List<ILSMComponent> olderList;
        if (version == 0) {
            newerList = diskComponents;
            olderList = secondDiskComponents;
            version = 1;
        } else {
            newerList = secondDiskComponents;
            olderList = diskComponents;
            version = 0;
        }
        // Remove components from list
        olderList.clear();
        // Add components
        olderList.addAll(newerList);
        if (newComponent != null) {
            // Add it to the list
            olderList.add(0, newComponent);
        }
    }

    @Override
    public synchronized void activate() throws HyracksDataException {
        if (isActivated) {
            throw new HyracksDataException("Failed to activate the index since it is already activated.");
        }

        if (diskComponents.size() == 0 && secondDiskComponents.size() == 0) {
            //First time activation
            List<LSMComponentFileReferences> validFileReferences;
            try {
                validFileReferences = fileManager.cleanupAndGetValidFiles();
            } catch (IndexException e) {
                throw new HyracksDataException(e);
            }
            for (LSMComponentFileReferences lsmComonentFileReference : validFileReferences) {
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