Examples with DefaultStoreClient voldemort.client.DefaultStoreClient used on opensource projects

Example 1 with DefaultStoreClient

use of voldemort.client.DefaultStoreClient in project voldemort by voldemort.

the class AbstractZonedRebalanceTest method testProxyGetDuringRebalancing.

@Test(timeout = 600000)
public void testProxyGetDuringRebalancing() throws Exception {
    logger.info("Starting testProxyGetDuringRebalancing");
    try {
        Cluster currentCluster = ServerTestUtils.getLocalZonedCluster(4, 2, new int[] { 0, 0, 1, 1 }, new int[][] { { 0, 2, 4 }, { 6 }, { 1, 3, 5 }, { 7 } });
        Cluster tmpfinalCluster = UpdateClusterUtils.createUpdatedCluster(currentCluster, 3, Lists.newArrayList(2));
        final Cluster finalCluster = UpdateClusterUtils.createUpdatedCluster(tmpfinalCluster, 1, Lists.newArrayList(3));
        final List<Integer> serverList = Arrays.asList(0, 1, 2, 3);
        Map<String, String> configProps = new HashMap<String, String>();
        configProps.put("admin.max.threads", "5");
        final Cluster updatedCurrentCluster = startServers(currentCluster, storeDefFileWithReplication, serverList, configProps);
        ExecutorService executors = Executors.newFixedThreadPool(2);
        final AtomicBoolean rebalancingComplete = new AtomicBoolean(false);
        final List<Exception> exceptions = Collections.synchronizedList(new ArrayList<Exception>());
        String bootstrapUrl = getBootstrapUrl(updatedCurrentCluster, 0);
        int maxParallel = 2;
        final ClusterTestUtils.RebalanceKit rebalanceKit = ClusterTestUtils.getRebalanceKit(bootstrapUrl, maxParallel, finalCluster);
        try {
            populateData(currentCluster, rwStoreDefWithReplication);
            final SocketStoreClientFactory factory = new SocketStoreClientFactory(new ClientConfig().setBootstrapUrls(getBootstrapUrl(currentCluster, 0)).setEnableLazy(false).setSocketTimeout(120, TimeUnit.SECONDS));
            final StoreClient<String, String> storeClientRW = new DefaultStoreClient<String, String>(rwStoreDefWithReplication.getName(), null, factory, 3);
            final CountDownLatch latch = new CountDownLatch(2);
            // start get operation.
            executors.execute(new Runnable() {

                @Override
                public void run() {
                    try {
                        List<String> keys = new ArrayList<String>(testEntries.keySet());
                        while (!rebalancingComplete.get()) {
                            // should always able to get values.
                            int index = (int) (Math.random() * keys.size());
                            // should get a valid value
                            try {
                                Versioned<String> value = storeClientRW.get(keys.get(index));
                                assertNotSame("StoreClient get() should not return null.", null, value);
                                assertEquals("Value returned should be good", new Versioned<String>(testEntries.get(keys.get(index))), value);
                            } catch (Exception e) {
                                logger.error("Exception in proxy get thread", e);
                                e.printStackTrace();
                                exceptions.add(e);
                            }
                        }
                    } catch (Exception e) {
                        logger.error("Exception in proxy get thread", e);
                        exceptions.add(e);
                    } finally {
                        factory.close();
                        latch.countDown();
                    }
                }
            });
            executors.execute(new Runnable() {

                @Override
                public void run() {
                    try {
                        Thread.sleep(500);
                        rebalanceAndCheck(rebalanceKit.plan, rebalanceKit.controller, Arrays.asList(0, 1, 2, 3));
                        Thread.sleep(500);
                        rebalancingComplete.set(true);
                        checkConsistentMetadata(finalCluster, serverList);
                    } catch (Exception e) {
                        exceptions.add(e);
                    } finally {
                        // stop servers
                        try {
                            stopServer(serverList);
                        } catch (Exception e) {
                            throw new RuntimeException(e);
                        }
                        latch.countDown();
                    }
                }
            });
            latch.await();
            executors.shutdown();
            executors.awaitTermination(300, TimeUnit.SECONDS);
            // check No Exception
            if (exceptions.size() > 0) {
                for (Exception e : exceptions) {
                    e.printStackTrace();
                }
                fail("Should not see any exceptions.");
            }
        } finally {
            // stop servers
            stopServer(serverList);
        }
    } catch (AssertionError ae) {
        logger.error("Assertion broken in testProxyGetDuringRebalancing ", ae);
        throw ae;
    }
}

Example 2 with DefaultStoreClient

use of voldemort.client.DefaultStoreClient in project voldemort by voldemort.

the class ZonedRebalanceNonContiguousZonesTest method testProxyPutDuringRebalancing.

@Test(timeout = 600000)
public void testProxyPutDuringRebalancing() throws Exception {
    logger.info("Starting testProxyPutDuringRebalancing");
    try {
        int[] zoneIds = new int[] { 1, 3 };
        int[][] nodesPerZone = new int[][] { { 3, 4, 5 }, { 9, 10, 11 } };
        int[][] partitionMap = new int[][] { { 0 }, { 1, 6 }, { 2 }, { 3 }, { 4, 7 }, { 5 } };
        Cluster currentCluster = ServerTestUtils.getLocalNonContiguousZonedCluster(zoneIds, nodesPerZone, partitionMap, ClusterTestUtils.getClusterPorts());
        Cluster finalCluster = UpdateClusterUtils.createUpdatedCluster(currentCluster, 5, Lists.newArrayList(7));
        finalCluster = UpdateClusterUtils.createUpdatedCluster(finalCluster, 11, Lists.newArrayList(6));
        /**
         * Original partition map
         *
         * [s3 : p0] [s4 : p1, p6] [s5 : p2]
         *
         * [s9 : p3] [s10 : p4, p7] [s11 : p5]
         *
         * final server partition ownership
         *
         * [s3 : p0] [s4 : p1] [s5 : p2, p7]
         *
         * [s9 : p3] [s10 : p4] [s11 : p5, p6]
         *
         * Note that rwStoreDefFileWithReplication is a "2/1/1" store def.
         *
         * Original server n-ary partition ownership
         *
         * [s3 : p0, p3-7] [s4 : p0-p7] [s5 : p1-2]
         *
         * [s9 : p0-3, p6-7] [s10 : p0-p7] [s11 : p4-5]
         *
         * final server n-ary partition ownership
         *
         * [s3 : p0, p2-7] [s4 : p0-1] [s5 : p1-p7]
         *
         * [s9 : p0-3, p5-7] [s10 : p0-4, p7] [s11 : p4-6]
         */
        List<Integer> serverList = Arrays.asList(3, 4, 5, 9, 10, 11);
        Map<String, String> configProps = new HashMap<String, String>();
        configProps.put("admin.max.threads", "5");
        final Cluster updatedCurrentCluster = startServers(currentCluster, rwStoreDefFileWithReplication, serverList, configProps);
        ExecutorService executors = Executors.newFixedThreadPool(2);
        final AtomicBoolean rebalancingComplete = new AtomicBoolean(false);
        final List<Exception> exceptions = Collections.synchronizedList(new ArrayList<Exception>());
        // Its is imperative that we test in a single shot since multiple batches would mean the proxy bridges
        // being torn down and established multiple times and we cannot test against the source
        // cluster topology then. getRebalanceKit uses batch size of infinite, so this should be fine.
        String bootstrapUrl = getBootstrapUrl(updatedCurrentCluster, 3);
        int maxParallel = 2;
        final ClusterTestUtils.RebalanceKit rebalanceKit = ClusterTestUtils.getRebalanceKit(bootstrapUrl, maxParallel, finalCluster);
        populateData(currentCluster, rwStoreDefWithReplication);
        final AdminClient adminClient = rebalanceKit.controller.getAdminClient();
        // the plan would cause these partitions to move:
        // Partition : Donor -> stealer
        // 
        // p2 (Z-SEC) : s4 -> s3
        // p3-6 (Z-PRI) : s4 -> s5
        // p7 (Z-PRI) : s3 -> s5
        // 
        // p5 (Z-SEC): s10 -> s9
        // p6 (Z-PRI): s10 -> s11
        // 
        // Rebalancing will run on servers 3, 5, 9, & 11
        final List<ByteArray> movingKeysList = sampleKeysFromPartition(adminClient, 4, rwStoreDefWithReplication.getName(), Arrays.asList(6), 20);
        assertTrue("Empty list of moving keys...", movingKeysList.size() > 0);
        final AtomicBoolean rebalancingStarted = new AtomicBoolean(false);
        final AtomicBoolean proxyWritesDone = new AtomicBoolean(false);
        final HashMap<String, String> baselineTuples = new HashMap<String, String>(testEntries);
        final HashMap<String, VectorClock> baselineVersions = new HashMap<String, VectorClock>();
        for (String key : baselineTuples.keySet()) {
            baselineVersions.put(key, new VectorClock());
        }
        final CountDownLatch latch = new CountDownLatch(2);
        // start get operation.
        executors.execute(new Runnable() {

            @Override
            public void run() {
                SocketStoreClientFactory factory = null;
                try {
                    // wait for the rebalancing to begin
                    List<VoldemortServer> serverList = Lists.newArrayList(serverMap.get(3), serverMap.get(5), serverMap.get(9), serverMap.get(11));
                    while (!rebalancingComplete.get()) {
                        Iterator<VoldemortServer> serverIterator = serverList.iterator();
                        while (serverIterator.hasNext()) {
                            VoldemortServer server = serverIterator.next();
                            if (ByteUtils.getString(server.getMetadataStore().get(MetadataStore.SERVER_STATE_KEY, null).get(0).getValue(), "UTF-8").compareTo(VoldemortState.REBALANCING_MASTER_SERVER.toString()) == 0) {
                                logger.info("Server " + server.getIdentityNode().getId() + " transitioned into REBALANCING MODE");
                                serverIterator.remove();
                            }
                        }
                        if (serverList.size() == 0) {
                            rebalancingStarted.set(true);
                            break;
                        }
                    }
                    if (rebalancingStarted.get()) {
                        factory = new SocketStoreClientFactory(new ClientConfig().setBootstrapUrls(getBootstrapUrl(updatedCurrentCluster, 3)).setEnableLazy(false).setSocketTimeout(120, TimeUnit.SECONDS).setClientZoneId(3));
                        final StoreClient<String, String> storeClientRW = new DefaultStoreClient<String, String>(testStoreNameRW, null, factory, 3);
                        // Initially, all data now with zero vector clock
                        for (ByteArray movingKey : movingKeysList) {
                            try {
                                String keyStr = ByteUtils.getString(movingKey.get(), "UTF-8");
                                String valStr = "proxy_write";
                                storeClientRW.put(keyStr, valStr);
                                baselineTuples.put(keyStr, valStr);
                                baselineVersions.get(keyStr).incrementVersion(11, System.currentTimeMillis());
                                proxyWritesDone.set(true);
                                if (rebalancingComplete.get()) {
                                    break;
                                }
                            } catch (InvalidMetadataException e) {
                                logger.error("Encountered an invalid metadata exception.. ", e);
                            }
                        }
                    }
                } catch (Exception e) {
                    logger.error("Exception in proxy write thread..", e);
                    exceptions.add(e);
                } finally {
                    if (factory != null)
                        factory.close();
                    latch.countDown();
                }
            }
        });
        executors.execute(new Runnable() {

            @Override
            public void run() {
                try {
                    rebalanceKit.rebalance();
                } catch (Exception e) {
                    logger.error("Error in rebalancing... ", e);
                    exceptions.add(e);
                } finally {
                    rebalancingComplete.set(true);
                    latch.countDown();
                }
            }
        });
        latch.await();
        executors.shutdown();
        executors.awaitTermination(300, TimeUnit.SECONDS);
        assertEquals("Client did not see all server transition into rebalancing state", rebalancingStarted.get(), true);
        assertEquals("Not enough time to begin proxy writing", proxyWritesDone.get(), true);
        checkEntriesPostRebalance(updatedCurrentCluster, finalCluster, Lists.newArrayList(rwStoreDefWithReplication), Arrays.asList(3, 4, 5, 9, 10, 11), baselineTuples, baselineVersions);
        checkConsistentMetadata(finalCluster, serverList);
        // check No Exception
        if (exceptions.size() > 0) {
            for (Exception e : exceptions) {
                e.printStackTrace();
            }
            fail("Should not see any exceptions.");
        }
        // check that the proxy writes were made to the original donor, node 4
        List<ClockEntry> clockEntries = new ArrayList<ClockEntry>(serverList.size());
        for (Integer nodeid : serverList) clockEntries.add(new ClockEntry(nodeid.shortValue(), System.currentTimeMillis()));
        VectorClock clusterXmlClock = new VectorClock(clockEntries, System.currentTimeMillis());
        for (Integer nodeid : serverList) adminClient.metadataMgmtOps.updateRemoteCluster(nodeid, currentCluster, clusterXmlClock);
        adminClient.setAdminClientCluster(currentCluster);
        checkForTupleEquivalence(adminClient, 4, testStoreNameRW, movingKeysList, baselineTuples, baselineVersions);
        // stop servers
        try {
            stopServer(serverList);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    } catch (AssertionError ae) {
        logger.error("Assertion broken in testProxyPutDuringRebalancing ", ae);
        throw ae;
    }
}

Example 3 with DefaultStoreClient

use of voldemort.client.DefaultStoreClient in project voldemort by voldemort.

the class ZonedRebalanceNonContiguousZonesTest method testProxyGetDuringRebalancing.

@Test(timeout = 600000)
public void testProxyGetDuringRebalancing() throws Exception {
    logger.info("Starting testProxyGetDuringRebalancing");
    try {
        int[] zoneIds = new int[] { 1, 3 };
        int[][] nodesPerZone = new int[][] { { 3, 4 }, { 9, 10 } };
        int[][] partitionMap = new int[][] { { 0, 2, 4 }, { 6 }, { 1, 3, 5 }, { 7 } };
        Cluster currentCluster = ServerTestUtils.getLocalNonContiguousZonedCluster(zoneIds, nodesPerZone, partitionMap, ClusterTestUtils.getClusterPorts());
        Cluster tmpfinalCluster = UpdateClusterUtils.createUpdatedCluster(currentCluster, 10, Lists.newArrayList(2));
        final Cluster finalCluster = UpdateClusterUtils.createUpdatedCluster(tmpfinalCluster, 4, Lists.newArrayList(3));
        // start servers
        final List<Integer> serverList = Arrays.asList(3, 4, 9, 10);
        Map<String, String> configProps = new HashMap<String, String>();
        configProps.put("admin.max.threads", "5");
        final Cluster updatedCurrentCluster = startServers(currentCluster, storeDefFileWithReplication, serverList, configProps);
        ExecutorService executors = Executors.newFixedThreadPool(2);
        final AtomicBoolean rebalancingComplete = new AtomicBoolean(false);
        final List<Exception> exceptions = Collections.synchronizedList(new ArrayList<Exception>());
        String bootstrapUrl = getBootstrapUrl(updatedCurrentCluster, 3);
        int maxParallel = 2;
        final ClusterTestUtils.RebalanceKit rebalanceKit = ClusterTestUtils.getRebalanceKit(bootstrapUrl, maxParallel, finalCluster);
        try {
            populateData(currentCluster, rwStoreDefWithReplication);
            final SocketStoreClientFactory factory = new SocketStoreClientFactory(new ClientConfig().setBootstrapUrls(getBootstrapUrl(currentCluster, 3)).setEnableLazy(false).setSocketTimeout(120, TimeUnit.SECONDS));
            final StoreClient<String, String> storeClientRW = new DefaultStoreClient<String, String>(rwStoreDefWithReplication.getName(), null, factory, 3);
            final CountDownLatch latch = new CountDownLatch(2);
            // start get operation.
            executors.execute(new Runnable() {

                @Override
                public void run() {
                    try {
                        List<String> keys = new ArrayList<String>(testEntries.keySet());
                        while (!rebalancingComplete.get()) {
                            // should always able to get values.
                            int index = (int) (Math.random() * keys.size());
                            // should get a valid value
                            try {
                                Versioned<String> value = storeClientRW.get(keys.get(index));
                                assertNotSame("StoreClient get() should not return null.", null, value);
                                assertEquals("Value returned should be good", new Versioned<String>(testEntries.get(keys.get(index))), value);
                            } catch (Exception e) {
                                logger.error("Exception in proxy get thread", e);
                                e.printStackTrace();
                                exceptions.add(e);
                            }
                        }
                    } catch (Exception e) {
                        logger.error("Exception in proxy get thread", e);
                        exceptions.add(e);
                    } finally {
                        factory.close();
                        latch.countDown();
                    }
                }
            });
            executors.execute(new Runnable() {

                @Override
                public void run() {
                    try {
                        Thread.sleep(500);
                        rebalanceAndCheck(rebalanceKit.plan, rebalanceKit.controller, Arrays.asList(3, 4, 9, 10));
                        Thread.sleep(500);
                        rebalancingComplete.set(true);
                        checkConsistentMetadata(finalCluster, serverList);
                    } catch (Exception e) {
                        exceptions.add(e);
                    } finally {
                        // stop servers
                        try {
                            stopServer(serverList);
                        } catch (Exception e) {
                            throw new RuntimeException(e);
                        }
                        latch.countDown();
                    }
                }
            });
            latch.await();
            executors.shutdown();
            executors.awaitTermination(300, TimeUnit.SECONDS);
            // check No Exception
            if (exceptions.size() > 0) {
                for (Exception e : exceptions) {
                    e.printStackTrace();
                }
                fail("Should not see any exceptions.");
            }
        } finally {
            // stop servers
            stopServer(serverList);
        }
    } catch (AssertionError ae) {
        logger.error("Assertion broken in testProxyGetDuringRebalancing ", ae);
        throw ae;
    }
}

Example 4 with DefaultStoreClient

use of voldemort.client.DefaultStoreClient in project voldemort by voldemort.

the class AbstractNonZonedRebalanceTest method testProxyGetDuringRebalancing.

@Test(timeout = 600000)
public void testProxyGetDuringRebalancing() throws Exception {
    logger.info("Starting testProxyGetDuringRebalancing");
    try {
        final Cluster currentCluster = ServerTestUtils.getLocalCluster(2, new int[][] { { 0, 1, 2, 3, 4, 5, 6 }, { 7, 8 } });
        final Cluster finalCluster = UpdateClusterUtils.createUpdatedCluster(currentCluster, 1, Lists.newArrayList(2, 3));
        // start servers 0 , 1 only
        final List<Integer> serverList = Arrays.asList(0, 1);
        Map<String, String> configProps = new HashMap<String, String>();
        configProps.put("admin.max.threads", "5");
        final Cluster updatedCurrentCluster = startServers(currentCluster, storeDefFileWithReplication, serverList, configProps);
        ExecutorService executors = Executors.newFixedThreadPool(2);
        final AtomicBoolean rebalancingComplete = new AtomicBoolean(false);
        final List<Exception> exceptions = Collections.synchronizedList(new ArrayList<Exception>());
        String bootstrapUrl = getBootstrapUrl(currentCluster, 0);
        int maxParallel = 2;
        final ClusterTestUtils.RebalanceKit rebalanceKit = ClusterTestUtils.getRebalanceKit(bootstrapUrl, maxParallel, finalCluster);
        // Populate the two stores
        populateData(updatedCurrentCluster, roStoreDefWithReplication, rebalanceKit.controller.getAdminClient(), true);
        populateData(updatedCurrentCluster, rwStoreDefWithReplication, rebalanceKit.controller.getAdminClient(), false);
        final SocketStoreClientFactory factory = new SocketStoreClientFactory(new ClientConfig().setBootstrapUrls(getBootstrapUrl(updatedCurrentCluster, 0)).setEnableLazy(false).setSocketTimeout(120, TimeUnit.SECONDS));
        final StoreClient<String, String> storeClientRW = new DefaultStoreClient<String, String>(testStoreNameRW, null, factory, 3);
        final StoreClient<String, String> storeClientRO = new DefaultStoreClient<String, String>(testStoreNameRO, null, factory, 3);
        final CountDownLatch latch = new CountDownLatch(2);
        // start get operation.
        executors.execute(new Runnable() {

            @Override
            public void run() {
                try {
                    List<String> keys = new ArrayList<String>(testEntries.keySet());
                    while (!rebalancingComplete.get()) {
                        // should always able to get values.
                        int index = (int) (Math.random() * keys.size());
                        // should get a valid value
                        try {
                            Versioned<String> value = storeClientRW.get(keys.get(index));
                            assertNotSame("StoreClient get() should not return null.", null, value);
                            assertEquals("Value returned should be good", new Versioned<String>(testEntries.get(keys.get(index))), value);
                            value = storeClientRO.get(keys.get(index));
                            assertNotSame("StoreClient get() should not return null.", null, value);
                            assertEquals("Value returned should be good", new Versioned<String>(testEntries.get(keys.get(index))), value);
                        } catch (Exception e) {
                            logger.error("Exception in online thread", e);
                            exceptions.add(e);
                        } finally {
                            latch.countDown();
                        }
                    }
                } catch (Exception e) {
                    logger.error("Exception in proxy get thread", e);
                    exceptions.add(e);
                } finally {
                    factory.close();
                }
            }
        });
        executors.execute(new Runnable() {

            @Override
            public void run() {
                try {
                    Thread.sleep(500);
                    rebalanceAndCheck(rebalanceKit.plan, rebalanceKit.controller, Arrays.asList(0, 1));
                    Thread.sleep(500);
                    rebalancingComplete.set(true);
                    checkConsistentMetadata(finalCluster, serverList);
                } catch (Exception e) {
                    exceptions.add(e);
                    logger.error("Exception in rebalancing thread", e);
                } finally {
                    // stop servers
                    try {
                        stopServer(serverList);
                    } catch (Exception e) {
                        throw new RuntimeException(e);
                    }
                    latch.countDown();
                }
            }
        });
        latch.await();
        executors.shutdown();
        executors.awaitTermination(300, TimeUnit.SECONDS);
        // check No Exception
        if (exceptions.size() > 0) {
            for (Exception e : exceptions) {
                e.printStackTrace();
            }
            fail("Should not see any exceptions.");
        }
    } catch (AssertionError ae) {
        logger.error("Assertion broken in testProxyGetDuringRebalancing ", ae);
        throw ae;
    }
}

Example 5 with DefaultStoreClient

use of voldemort.client.DefaultStoreClient in project voldemort by voldemort.

the class AbstractZonedRebalanceTest method testProxyPutDuringRebalancing.

@Test(timeout = 600000)
public void testProxyPutDuringRebalancing() throws Exception {
    logger.info("Starting testProxyPutDuringRebalancing");
    try {
        Cluster currentCluster = ServerTestUtils.getLocalZonedCluster(6, 2, new int[] { 0, 0, 0, 1, 1, 1 }, new int[][] { { 0 }, { 1, 6 }, { 2 }, { 3 }, { 4, 7 }, { 5 } });
        Cluster finalCluster = UpdateClusterUtils.createUpdatedCluster(currentCluster, 2, Lists.newArrayList(7));
        finalCluster = UpdateClusterUtils.createUpdatedCluster(finalCluster, 5, Lists.newArrayList(6));
        /**
         * Original partition map
         *
         * [s0 : p0] [s1 : p1, p6] [s2 : p2]
         *
         * [s3 : p3] [s4 : p4, p7] [s5 : p5]
         *
         * final server partition ownership
         *
         * [s0 : p0] [s1 : p1] [s2 : p2, p7]
         *
         * [s3 : p3] [s4 : p4] [s5 : p5, p6]
         *
         * Note that rwStoreDefFileWithReplication is a "2/1/1" store def.
         *
         * Original server n-ary partition ownership
         *
         * [s0 : p0, p3-7] [s1 : p0-p7] [s2 : p1-2]
         *
         * [s3 : p0-3, p6-7] [s4 : p0-p7] [s5 : p4-5]
         *
         * final server n-ary partition ownership
         *
         * [s0 : p0, p2-7] [s1 : p0-1] [s2 : p1-p7]
         *
         * [s3 : p0-3, p5-7] [s4 : p0-4, p7] [s5 : p4-6]
         */
        List<Integer> serverList = Arrays.asList(0, 1, 2, 3, 4, 5);
        Map<String, String> configProps = new HashMap<String, String>();
        configProps.put("admin.max.threads", "5");
        final Cluster updatedCurrentCluster = startServers(currentCluster, rwStoreDefFileWithReplication, serverList, configProps);
        ExecutorService executors = Executors.newFixedThreadPool(2);
        final AtomicBoolean rebalancingComplete = new AtomicBoolean(false);
        final List<Exception> exceptions = Collections.synchronizedList(new ArrayList<Exception>());
        // Its is imperative that we test in a single shot since multiple
        // batches would mean the proxy bridges being torn down and
        // established multiple times and we cannot test against the source
        // cluster topology then. getRebalanceKit uses batch size of
        // infinite, so this should be fine.
        String bootstrapUrl = getBootstrapUrl(updatedCurrentCluster, 0);
        int maxParallel = 2;
        final ClusterTestUtils.RebalanceKit rebalanceKit = ClusterTestUtils.getRebalanceKit(bootstrapUrl, maxParallel, finalCluster);
        populateData(currentCluster, rwStoreDefWithReplication);
        final AdminClient adminClient = rebalanceKit.controller.getAdminClient();
        // the plan would cause these partitions to move:
        // Partition : Donor -> stealer
        // 
        // p2 (Z-SEC) : s1 -> s0
        // p3-6 (Z-PRI) : s1 -> s2
        // p7 (Z-PRI) : s0 -> s2
        // 
        // p5 (Z-SEC): s4 -> s3
        // p6 (Z-PRI): s4 -> s5
        // 
        // :. rebalancing will run on servers 0, 2, 3, & 5
        final List<ByteArray> movingKeysList = sampleKeysFromPartition(adminClient, 1, rwStoreDefWithReplication.getName(), Arrays.asList(6), 20);
        assertTrue("Empty list of moving keys...", movingKeysList.size() > 0);
        final AtomicBoolean rebalancingStarted = new AtomicBoolean(false);
        final AtomicBoolean proxyWritesDone = new AtomicBoolean(false);
        final HashMap<String, String> baselineTuples = new HashMap<String, String>(testEntries);
        final HashMap<String, VectorClock> baselineVersions = new HashMap<String, VectorClock>();
        for (String key : baselineTuples.keySet()) {
            baselineVersions.put(key, new VectorClock());
        }
        final CountDownLatch latch = new CountDownLatch(2);
        // start get operation.
        executors.execute(new Runnable() {

            @Override
            public void run() {
                SocketStoreClientFactory factory = null;
                try {
                    // wait for the rebalancing to begin
                    List<VoldemortServer> serverList = Lists.newArrayList(serverMap.get(0), serverMap.get(2), serverMap.get(3), serverMap.get(5));
                    while (!rebalancingComplete.get()) {
                        Iterator<VoldemortServer> serverIterator = serverList.iterator();
                        while (serverIterator.hasNext()) {
                            VoldemortServer server = serverIterator.next();
                            if (ByteUtils.getString(server.getMetadataStore().get(MetadataStore.SERVER_STATE_KEY, null).get(0).getValue(), "UTF-8").compareTo(VoldemortState.REBALANCING_MASTER_SERVER.toString()) == 0) {
                                logger.info("Server " + server.getIdentityNode().getId() + " transitioned into REBALANCING MODE");
                                serverIterator.remove();
                            }
                        }
                        if (serverList.size() == 0) {
                            rebalancingStarted.set(true);
                            break;
                        }
                    }
                    if (rebalancingStarted.get()) {
                        factory = new SocketStoreClientFactory(new ClientConfig().setBootstrapUrls(getBootstrapUrl(updatedCurrentCluster, 0)).setEnableLazy(false).setSocketTimeout(120, TimeUnit.SECONDS).setClientZoneId(1));
                        final StoreClient<String, String> storeClientRW = new DefaultStoreClient<String, String>(testStoreNameRW, null, factory, 3);
                        // now with zero vector clock
                        for (ByteArray movingKey : movingKeysList) {
                            try {
                                String keyStr = ByteUtils.getString(movingKey.get(), "UTF-8");
                                String valStr = "proxy_write";
                                storeClientRW.put(keyStr, valStr);
                                baselineTuples.put(keyStr, valStr);
                                // all these keys will have [5:1] vector
                                // clock is node 5 is the new pseudo master
                                baselineVersions.get(keyStr).incrementVersion(5, System.currentTimeMillis());
                                proxyWritesDone.set(true);
                                if (rebalancingComplete.get()) {
                                    break;
                                }
                            } catch (InvalidMetadataException e) {
                                // let this go
                                logger.error("Encountered an invalid metadata exception.. ", e);
                            }
                        }
                    }
                } catch (Exception e) {
                    logger.error("Exception in proxy write thread..", e);
                    exceptions.add(e);
                } finally {
                    if (factory != null)
                        factory.close();
                    latch.countDown();
                }
            }
        });
        executors.execute(new Runnable() {

            @Override
            public void run() {
                try {
                    rebalanceKit.rebalance();
                } catch (Exception e) {
                    logger.error("Error in rebalancing... ", e);
                    exceptions.add(e);
                } finally {
                    rebalancingComplete.set(true);
                    latch.countDown();
                }
            }
        });
        latch.await();
        executors.shutdown();
        executors.awaitTermination(300, TimeUnit.SECONDS);
        assertEquals("Client did not see all server transition into rebalancing state", rebalancingStarted.get(), true);
        assertEquals("Not enough time to begin proxy writing", proxyWritesDone.get(), true);
        checkEntriesPostRebalance(updatedCurrentCluster, finalCluster, Lists.newArrayList(rwStoreDefWithReplication), Arrays.asList(0, 1, 2, 3, 4, 5), baselineTuples, baselineVersions);
        checkConsistentMetadata(finalCluster, serverList);
        // check No Exception
        if (exceptions.size() > 0) {
            for (Exception e : exceptions) {
                e.printStackTrace();
            }
            fail("Should not see any exceptions.");
        }
        // check that the proxy writes were made to the original donor, node
        // 1
        List<ClockEntry> clockEntries = new ArrayList<ClockEntry>(serverList.size());
        for (Integer nodeid : serverList) clockEntries.add(new ClockEntry(nodeid.shortValue(), System.currentTimeMillis()));
        VectorClock clusterXmlClock = new VectorClock(clockEntries, System.currentTimeMillis());
        for (Integer nodeid : serverList) adminClient.metadataMgmtOps.updateRemoteCluster(nodeid, currentCluster, clusterXmlClock);
        adminClient.setAdminClientCluster(currentCluster);
        checkForTupleEquivalence(adminClient, 1, testStoreNameRW, movingKeysList, baselineTuples, baselineVersions);
        // stop servers
        try {
            stopServer(serverList);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    } catch (AssertionError ae) {
        logger.error("Assertion broken in testProxyPutDuringRebalancing ", ae);
        throw ae;
    }
}