Examples of org.apache.cassandra.repair.RepairSession

org.apache.cassandra.repair.RepairSession
Coordinates the (active) repair of a token range. A given RepairSession repairs a set of replicas for a given range on a list of column families. For each of the column family to repair, RepairSession creates a RepairJob that handles the repair of that CF. A given RepairJob has the 2 main phases: 1. Validation phase: the job requests merkle trees from each of the replica involves (RepairJob.sendTreeRequests()) and waits until all trees are received (in validationComplete()). 2. Synchonization phase: once all trees are received, the job compares each tree with all the other using a so-called Differencer (started by submitDifferencers()). If differences there is between 2 trees, the concerned Differencer will start a streaming of the difference between the 2 endpoint concerned (Differencer.performStreamingRepair). The job is done once all its Differencer are done (i.e. have either computed no differences or the streaming they started is done (syncComplete())). A given session will execute the first phase (validation phase) of each of it's job sequentially. In other words, it will start the first job and only start the next one once that first job validation phase is complete. This is done so that the replica only create one merkle tree at a time, which is our way to ensure that such creation starts roughly at the same time on every node (see CASSANDRA-2816). However the synchronization phases are allowed to run concurrently (with each other and with validation phases). A given RepairJob has 2 modes: either sequential or not (isSequential flag). If sequential, it will requests merkle tree creation from each replica in sequence (though in that case we still first send a message to each node to flush and snapshot data so each merkle tree creation is still done on similar data, even if the actual creation is not done simulatneously). If not sequential, all merkle tree are requested in parallel. Similarly, if a job is sequential, it will handle one Differencer at a time, but will handle all of them in parallel otherwise.

                {
                    cfnames[i] = columnFamilyStores.get(i).name;
                }
                for (Range<Token> range : options.getRanges())
                {
                    final RepairSession session = ActiveRepairService.instance.submitRepairSession(parentSession,
                                                                      range,
                                                                      keyspace,
                                                                      options.isSequential(),
                                                                      rangeToNeighbors.get(range),
                                                                      repairedAt,
                                                                      executor,
                                                                      cfnames);
                    if (session == null)
                        continue;
                    // After repair session completes, notify client its result
                    Futures.addCallback(session, new FutureCallback<RepairSessionResult>()
                    {
                        public void onSuccess(RepairSessionResult result)
                        {
                            String message = String.format("Repair session %s for range %s finished", session.getId(), session.getRange().toString());
                            logger.info(message);
                            sendNotification("repair", message, new int[]{cmd, ActiveRepairService.Status.SESSION_SUCCESS.ordinal()});
                        }


                        public void onFailure(Throwable t)
                        {
                            String message = String.format("Repair session %s for range %s failed with error %s", session.getId(), session.getRange().toString(), t.getMessage());
                            logger.error(message, t);
                            sendNotification("repair", message, new int[]{cmd, ActiveRepairService.Status.SESSION_FAILED.ordinal()});
                        }
                    });
                    futures.add(session);

View Full Code Here

                                             String... cfnames)
    {
        if (endpoints.isEmpty())
            return null;


        final RepairSession session = new RepairSession(parentRepairSession, UUIDGen.getTimeUUID(), range, keyspace, isSequential, endpoints, repairedAt, cfnames);


        sessions.put(session.getId(), session);
        // register listeners
        gossiper.register(session);
        failureDetector.registerFailureDetectionEventListener(session);


        // unregister listeners at completion
        session.addListener(new Runnable()
        {
            /**
             * When repair finished, do clean up
             */
            public void run()
            {
                failureDetector.unregisterFailureDetectionEventListener(session);
                gossiper.unregister(session);
                sessions.remove(session.getId());
            }
        }, MoreExecutors.sameThreadExecutor());
        session.start(executor);
        return session;
    }

View Full Code Here

    }


    public void handleMessage(InetAddress endpoint, RepairMessage message)
    {
        RepairJobDesc desc = message.desc;
        RepairSession session = sessions.get(desc.sessionId);
        if (session == null)
            return;
        switch (message.messageType)
        {
            case VALIDATION_COMPLETE:
                ValidationComplete validation = (ValidationComplete) message;
                session.validationComplete(desc, endpoint, validation.tree);
                break;
            case SYNC_COMPLETE:
                // one of replica is synced.
                SyncComplete sync = (SyncComplete) message;
                session.syncComplete(desc, sync.nodes, sync.success);
                break;
            default:
                break;
        }
    }

View Full Code Here

TOP

Related Classes of org.apache.cassandra.repair.RepairSession

org.apache.cassandra.service.ActiveRepairService

org.apache.cassandra.service.StorageService

org.apache.cassandra.exceptions.RepairException

java.io.IOException

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.