Examples with Request org.apache.zookeeper.server.Request used on opensource projects

Example 46 with Request

use of org.apache.zookeeper.server.Request in project zookeeper by apache.

the class FollowerZooKeeperServer method sync.

public synchronized void sync() {
    if (pendingSyncs.size() == 0) {
        LOG.warn("Not expecting a sync.");
        return;
    }
    Request r = pendingSyncs.remove();
    if (r instanceof LearnerSyncRequest) {
        LearnerSyncRequest lsr = (LearnerSyncRequest) r;
        lsr.fh.queuePacket(new QuorumPacket(Leader.SYNC, 0, null, null));
    }
    commitProcessor.commit(r);
}

Example 47 with Request

use of org.apache.zookeeper.server.Request in project zookeeper by apache.

the class FollowerZooKeeperServer method logRequest.

public void logRequest(TxnHeader hdr, Record txn, TxnDigest digest) {
    Request request = new Request(hdr.getClientId(), hdr.getCxid(), hdr.getType(), hdr, txn, hdr.getZxid());
    request.setTxnDigest(digest);
    if ((request.zxid & 0xffffffffL) != 0) {
        pendingTxns.add(request);
    }
    syncProcessor.processRequest(request);
}

Example 48 with Request

use of org.apache.zookeeper.server.Request in project zookeeper by apache.

the class Follower method processPacket.

/**
 * Examine the packet received in qp and dispatch based on its contents.
 * @param qp
 * @throws IOException
 */
protected void processPacket(QuorumPacket qp) throws Exception {
    switch(qp.getType()) {
        case Leader.PING:
            ping(qp);
            break;
        case Leader.PROPOSAL:
            ServerMetrics.getMetrics().LEARNER_PROPOSAL_RECEIVED_COUNT.add(1);
            TxnLogEntry logEntry = SerializeUtils.deserializeTxn(qp.getData());
            TxnHeader hdr = logEntry.getHeader();
            Record txn = logEntry.getTxn();
            TxnDigest digest = logEntry.getDigest();
            if (hdr.getZxid() != lastQueued + 1) {
                LOG.warn("Got zxid 0x{} expected 0x{}", Long.toHexString(hdr.getZxid()), Long.toHexString(lastQueued + 1));
            }
            lastQueued = hdr.getZxid();
            if (hdr.getType() == OpCode.reconfig) {
                SetDataTxn setDataTxn = (SetDataTxn) txn;
                QuorumVerifier qv = self.configFromString(new String(setDataTxn.getData(), UTF_8));
                self.setLastSeenQuorumVerifier(qv, true);
            }
            fzk.logRequest(hdr, txn, digest);
            if (hdr != null) {
                /*
                 * Request header is created only by the leader, so this is only set
                 * for quorum packets. If there is a clock drift, the latency may be
                 * negative. Headers use wall time, not CLOCK_MONOTONIC.
                 */
                long now = Time.currentWallTime();
                long latency = now - hdr.getTime();
                if (latency >= 0) {
                    ServerMetrics.getMetrics().PROPOSAL_LATENCY.add(latency);
                }
            }
            if (om != null) {
                final long startTime = Time.currentElapsedTime();
                om.proposalReceived(qp);
                ServerMetrics.getMetrics().OM_PROPOSAL_PROCESS_TIME.add(Time.currentElapsedTime() - startTime);
            }
            break;
        case Leader.COMMIT:
            ServerMetrics.getMetrics().LEARNER_COMMIT_RECEIVED_COUNT.add(1);
            fzk.commit(qp.getZxid());
            if (om != null) {
                final long startTime = Time.currentElapsedTime();
                om.proposalCommitted(qp.getZxid());
                ServerMetrics.getMetrics().OM_COMMIT_PROCESS_TIME.add(Time.currentElapsedTime() - startTime);
            }
            break;
        case Leader.COMMITANDACTIVATE:
            // get the new configuration from the request
            Request request = fzk.pendingTxns.element();
            SetDataTxn setDataTxn = (SetDataTxn) request.getTxn();
            QuorumVerifier qv = self.configFromString(new String(setDataTxn.getData(), UTF_8));
            // get new designated leader from (current) leader's message
            ByteBuffer buffer = ByteBuffer.wrap(qp.getData());
            long suggestedLeaderId = buffer.getLong();
            final long zxid = qp.getZxid();
            boolean majorChange = self.processReconfig(qv, suggestedLeaderId, zxid, true);
            // commit (writes the new config to ZK tree (/zookeeper/config)
            fzk.commit(zxid);
            if (om != null) {
                om.informAndActivate(zxid, suggestedLeaderId);
            }
            if (majorChange) {
                throw new Exception("changes proposed in reconfig");
            }
            break;
        case Leader.UPTODATE:
            LOG.error("Received an UPTODATE message after Follower started");
            break;
        case Leader.REVALIDATE:
            if (om == null || !om.revalidateLearnerSession(qp)) {
                revalidate(qp);
            }
            break;
        case Leader.SYNC:
            fzk.sync();
            break;
        default:
            LOG.warn("Unknown packet type: {}", LearnerHandler.packetToString(qp));
            break;
    }
}

Example 49 with Request

use of org.apache.zookeeper.server.Request in project zookeeper by apache.

the class CommitProcessorMetricsTest method testRequestsInSessionQueue.

@Test
public void testRequestsInSessionQueue() throws Exception {
    setupProcessors(0, 0);
    Request req1 = createWriteRequest(1L, 1);
    processRequestWithWait(req1);
    checkMetrics("requests_in_session_queue", 1L, 1L, 1D, 1L, 1L);
    // these two read requests will be stuck in the session queue because there is write in front of them
    processRequestWithWait(createReadRequest(1L, 2));
    processRequestWithWait(createReadRequest(1L, 3));
    checkMetrics("requests_in_session_queue", 1L, 3L, 2D, 3L, 6);
    commitWithWait(req1);
    checkMetrics("requests_in_session_queue", 1L, 3L, 2.25D, 4L, 9);
}

Example 50 with Request

use of org.apache.zookeeper.server.Request in project zookeeper by apache.

the class FileTxnSnapLogTest method testGetTxnLogSyncElapsedTime.

@Test
public void testGetTxnLogSyncElapsedTime() throws IOException {
    FileTxnSnapLog fileTxnSnapLog = createFileTxnSnapLogWithAutoCreateDataDir(logDir, snapDir, "true");
    TxnHeader hdr = new TxnHeader(1, 1, 1, 1, ZooDefs.OpCode.setData);
    Record txn = new SetDataTxn("/foo", new byte[0], 1);
    Request req = new Request(0, 0, 0, hdr, txn, 0);
    try {
        fileTxnSnapLog.append(req);
        fileTxnSnapLog.commit();
        long syncElapsedTime = fileTxnSnapLog.getTxnLogElapsedSyncTime();
        assertNotEquals(-1L, syncElapsedTime, "Did not update syncElapsedTime!");
    } finally {
        fileTxnSnapLog.close();
    }
}