bookkeeper-server/src/main/java/org/apache/bookkeeper/client/RackawareEnsemblePlacementPolicy.java [95:151]:
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            slave = null;
        }
        return this;
    }

    @Override
    public void uninitalize() {
        super.uninitalize();
        if (null != slave) {
            slave.uninitalize();
        }
    }

    @Override
    public Set<BookieId> onClusterChanged(Set<BookieId> writableBookies,
            Set<BookieId> readOnlyBookies) {
        Set<BookieId> deadBookies = super.onClusterChanged(writableBookies, readOnlyBookies);
        if (null != slave) {
            deadBookies = slave.onClusterChanged(writableBookies, readOnlyBookies);
        }
        return deadBookies;
    }

    @Override
    public PlacementResult<List<BookieId>> newEnsemble(int ensembleSize, int writeQuorumSize,
            int ackQuorumSize, Map<String, byte[]> customMetadata, Set<BookieId> excludeBookies)
            throws BKException.BKNotEnoughBookiesException {
        try {
            return super.newEnsemble(ensembleSize, writeQuorumSize, ackQuorumSize, customMetadata, excludeBookies);
        } catch (BKException.BKNotEnoughBookiesException bnebe) {
            if (slave == null) {
                throw bnebe;
            } else {
                return slave.newEnsemble(ensembleSize, writeQuorumSize, ackQuorumSize, customMetadata, excludeBookies);
            }
        }
    }

    @Override
    public PlacementResult<BookieId> replaceBookie(int ensembleSize, int writeQuorumSize, int ackQuorumSize,
            Map<String, byte[]> customMetadata, List<BookieId> currentEnsemble,
            BookieId bookieToReplace, Set<BookieId> excludeBookies)
            throws BKException.BKNotEnoughBookiesException {
       try {
            return super.replaceBookie(ensembleSize, writeQuorumSize, ackQuorumSize, customMetadata,
                    currentEnsemble, bookieToReplace, excludeBookies);
        } catch (BKException.BKNotEnoughBookiesException bnebe) {
            if (slave == null) {
                throw bnebe;
            } else {
                return slave.replaceBookie(ensembleSize, writeQuorumSize, ackQuorumSize, customMetadata,
                        currentEnsemble, bookieToReplace, excludeBookies);
            }
        }
    }

    @Override
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bookkeeper-server/src/main/java/org/apache/bookkeeper/client/ZoneawareEnsemblePlacementPolicy.java [60:116]:
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            slave = null;
        }
        return this;
    }

    @Override
    public void uninitalize() {
        super.uninitalize();
        if (null != slave) {
            slave.uninitalize();
        }
    }

    @Override
    public Set<BookieId> onClusterChanged(Set<BookieId> writableBookies,
            Set<BookieId> readOnlyBookies) {
        Set<BookieId> deadBookies = super.onClusterChanged(writableBookies, readOnlyBookies);
        if (null != slave) {
            deadBookies = slave.onClusterChanged(writableBookies, readOnlyBookies);
        }
        return deadBookies;
    }

    @Override
    public PlacementResult<List<BookieId>> newEnsemble(int ensembleSize, int writeQuorumSize,
            int ackQuorumSize, Map<String, byte[]> customMetadata, Set<BookieId> excludeBookies)
            throws BKException.BKNotEnoughBookiesException {
        try {
            return super.newEnsemble(ensembleSize, writeQuorumSize, ackQuorumSize, customMetadata, excludeBookies);
        } catch (BKException.BKNotEnoughBookiesException bnebe) {
            if (slave == null) {
                throw bnebe;
            } else {
                return slave.newEnsemble(ensembleSize, writeQuorumSize, ackQuorumSize, customMetadata, excludeBookies);
            }
        }
    }

    @Override
    public PlacementResult<BookieId> replaceBookie(int ensembleSize, int writeQuorumSize, int ackQuorumSize,
            Map<String, byte[]> customMetadata, List<BookieId> currentEnsemble,
            BookieId bookieToReplace, Set<BookieId> excludeBookies)
            throws BKException.BKNotEnoughBookiesException {
       try {
            return super.replaceBookie(ensembleSize, writeQuorumSize, ackQuorumSize, customMetadata,
                    currentEnsemble, bookieToReplace, excludeBookies);
        } catch (BKException.BKNotEnoughBookiesException bnebe) {
            if (slave == null) {
                throw bnebe;
            } else {
                return slave.replaceBookie(ensembleSize, writeQuorumSize, ackQuorumSize, customMetadata,
                        currentEnsemble, bookieToReplace, excludeBookies);
            }
        }
    }

    @Override
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