Package org.apache.cassandra.db

Examples of org.apache.cassandra.db.ReadCommand

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                return;

            if (!handler.await(cfs.sampleLatencyNanos, TimeUnit.NANOSECONDS))
            {
                // Could be waiting on the data, or on enough digests.
                ReadCommand retryCommand = command;
                if (resolver.getData() != null)
                {
                    retryCommand = command.copy();
                    retryCommand.setDigestQuery(true);
                }

                InetAddress extraReplica = Iterables.getLast(targetReplicas);
                logger.trace("speculating read retry on {}", extraReplica);
                MessagingService.instance().sendRR(retryCommand.createMessage(), extraReplica, handler);
                speculated = true;

                cfs.metric.speculativeRetries.inc();
            }
        }
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                if (logger.isDebugEnabled())
                    logger.debug("Digest mismatch:", e);
               
                ReadRepairMetrics.repairedBackground.mark();
               
                ReadCommand readCommand = (ReadCommand) command;
                final RowDataResolver repairResolver = new RowDataResolver(readCommand.ksName, readCommand.key, readCommand.filter(), readCommand.timestamp);
                AsyncRepairCallback repairHandler = new AsyncRepairCallback(repairResolver, endpoints.size());

                MessageOut<ReadCommand> message = ((ReadCommand) command).createMessage();
                for (InetAddress endpoint : endpoints)
                    MessagingService.instance().sendRR(message, endpoint, repairHandler);
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        if (handler.endpoints.size() == 1)
            return;

        // send the other endpoints a digest request
        ReadCommand digestCommand = command.copy();
        digestCommand.setDigestQuery(true);
        MessageOut<?> message = null;
        for (int i = 1; i < handler.endpoints.size(); i++)
        {
            InetAddress digestPoint = handler.endpoints.get(i);
            if (digestPoint.equals(FBUtilities.getBroadcastAddress()))
            {
                logger.trace("reading digest locally");
                StageManager.getStage(Stage.READ).execute(new LocalReadRunnable(digestCommand, handler));
            }
            else
            {
                logger.trace("reading digest from {}", digestPoint);
                // (We lazy-construct the digest Message object since it may not be necessary if we
                // are doing a local digest read, or no digest reads at all.)
                if (message == null)
                    message = digestCommand.createMessage();
                MessagingService.instance().sendRR(message, digestPoint, handler);
            }
        }
    }
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            if (!handler.await(cfs.sampleLatency, TimeUnit.NANOSECONDS))
            {
                InetAddress endpoint = unfiltered.get(handler.endpoints.size());

                // could be waiting on the data, or on enough digests
                ReadCommand scommand = command;
                if (resolver.getData() != null)
                {
                    scommand = command.copy();
                    scommand.setDigestQuery(true);
                }

                logger.trace("Speculating read retry on {}", endpoint);
                MessagingService.instance().sendRR(scommand.createMessage(), endpoint, handler);
                cfs.metric.speculativeRetry.inc();
            }
        }
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                }
            }
            if (handler.endpoints.size() <= limit)
                return;

            ReadCommand digestCommand = command.copy();
            digestCommand.setDigestQuery(true);
            MessageOut<?> message = digestCommand.createMessage();
            for (int i = limit; i < handler.endpoints.size(); i++)
            {
                // Send the message
                InetAddress endpoint = handler.endpoints.get(i);
                if (endpoint.equals(FBUtilities.getBroadcastAddress()))
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                if (logger.isDebugEnabled())
                    logger.debug("Digest mismatch:", e);
               
                ReadRepairMetrics.repairedBackground.mark();
               
                ReadCommand readCommand = (ReadCommand) command;
                final RowDataResolver repairResolver = new RowDataResolver(readCommand.table, readCommand.key, readCommand.filter());
                IAsyncCallback repairHandler = new AsyncRepairCallback(repairResolver, endpoints.size());

                MessageOut<ReadCommand> message = ((ReadCommand) command).createMessage();
                for (InetAddress endpoint : endpoints)
                    MessagingService.instance().sendRR(message, endpoint, repairHandler);
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        Row row = null;
        try
        {
            String key = (String)(rowKey_.get());
            ReadCommand readCommand = new SliceReadCommand(cfMetaData_.tableName, key, columnFamily_column, offset_, limit_);
            row = StorageProxy.readProtocol(readCommand, StorageService.ConsistencyLevel.WEAK);
        }
        catch (Exception e)
        {
            logger_.error(LogUtil.throwableToString(e));
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    {
        Row row = null;
        try
        {
            String key = (String)(rowKey_.get());
            ReadCommand readCommand = new SliceReadCommand(cfMetaData_.tableName, key, cfMetaData_.cfName, offset_, limit_);
            row = StorageProxy.readProtocol(readCommand, StorageService.ConsistencyLevel.WEAK);
        }
        catch (Exception e)
        {
            logger_.error(LogUtil.throwableToString(e));
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                if (logger.isDebugEnabled())
                    logger.debug("Digest mismatch:", e);
               
                ReadRepairMetrics.repairedBackground.mark();
               
                ReadCommand readCommand = (ReadCommand) command;
                final RowDataResolver repairResolver = new RowDataResolver(readCommand.ksName, readCommand.key, readCommand.filter(), readCommand.timestamp);
                AsyncRepairCallback repairHandler = new AsyncRepairCallback(repairResolver, endpoints.size());

                MessageOut<ReadCommand> message = ((ReadCommand) command).createMessage();
                for (InetAddress endpoint : endpoints)
                    MessagingService.instance().sendRR(message, endpoint, repairHandler);
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        }
    }

    protected void makeDigestRequests(Iterable<InetAddress> endpoints)
    {
        ReadCommand digestCommand = command.copy();
        digestCommand.setDigestQuery(true);
        MessageOut<?> message = digestCommand.createMessage();
        for (InetAddress endpoint : endpoints)
        {
            if (isLocalRequest(endpoint))
            {
                logger.trace("reading digest locally");
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