Examples with CheckVersionTxn org.apache.zookeeper.txn.CheckVersionTxn used on opensource projects

Example 1 with CheckVersionTxn

use of org.apache.zookeeper.txn.CheckVersionTxn in project zookeeper by apache.

the class PrepRequestProcessor method pRequest2Txn.

/**
     * This method will be called inside the ProcessRequestThread, which is a
     * singleton, so there will be a single thread calling this code.
     *
     * @param type
     * @param zxid
     * @param request
     * @param record
     */
protected void pRequest2Txn(int type, long zxid, Request request, Record record, boolean deserialize) throws KeeperException, IOException, RequestProcessorException {
    request.setHdr(new TxnHeader(request.sessionId, request.cxid, zxid, Time.currentWallTime(), type));
    switch(type) {
        case OpCode.create:
        case OpCode.create2:
        case OpCode.createTTL:
        case OpCode.createContainer:
            {
                pRequest2TxnCreate(type, request, record, deserialize);
                break;
            }
        case OpCode.deleteContainer:
            {
                String path = new String(request.request.array());
                String parentPath = getParentPathAndValidate(path);
                ChangeRecord parentRecord = getRecordForPath(parentPath);
                ChangeRecord nodeRecord = getRecordForPath(path);
                if (nodeRecord.childCount > 0) {
                    throw new KeeperException.NotEmptyException(path);
                }
                if (EphemeralType.get(nodeRecord.stat.getEphemeralOwner()) == EphemeralType.NORMAL) {
                    throw new KeeperException.BadVersionException(path);
                }
                request.setTxn(new DeleteTxn(path));
                parentRecord = parentRecord.duplicate(request.getHdr().getZxid());
                parentRecord.childCount--;
                addChangeRecord(parentRecord);
                addChangeRecord(new ChangeRecord(request.getHdr().getZxid(), path, null, -1, null));
                break;
            }
        case OpCode.delete:
            zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
            DeleteRequest deleteRequest = (DeleteRequest) record;
            if (deserialize)
                ByteBufferInputStream.byteBuffer2Record(request.request, deleteRequest);
            String path = deleteRequest.getPath();
            String parentPath = getParentPathAndValidate(path);
            ChangeRecord parentRecord = getRecordForPath(parentPath);
            ChangeRecord nodeRecord = getRecordForPath(path);
            checkACL(zks, request.cnxn, parentRecord.acl, ZooDefs.Perms.DELETE, request.authInfo, path, null);
            checkAndIncVersion(nodeRecord.stat.getVersion(), deleteRequest.getVersion(), path);
            if (nodeRecord.childCount > 0) {
                throw new KeeperException.NotEmptyException(path);
            }
            request.setTxn(new DeleteTxn(path));
            parentRecord = parentRecord.duplicate(request.getHdr().getZxid());
            parentRecord.childCount--;
            addChangeRecord(parentRecord);
            addChangeRecord(new ChangeRecord(request.getHdr().getZxid(), path, null, -1, null));
            break;
        case OpCode.setData:
            zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
            SetDataRequest setDataRequest = (SetDataRequest) record;
            if (deserialize)
                ByteBufferInputStream.byteBuffer2Record(request.request, setDataRequest);
            path = setDataRequest.getPath();
            validatePath(path, request.sessionId);
            nodeRecord = getRecordForPath(path);
            checkACL(zks, request.cnxn, nodeRecord.acl, ZooDefs.Perms.WRITE, request.authInfo, path, null);
            int newVersion = checkAndIncVersion(nodeRecord.stat.getVersion(), setDataRequest.getVersion(), path);
            request.setTxn(new SetDataTxn(path, setDataRequest.getData(), newVersion));
            nodeRecord = nodeRecord.duplicate(request.getHdr().getZxid());
            nodeRecord.stat.setVersion(newVersion);
            addChangeRecord(nodeRecord);
            break;
        case OpCode.reconfig:
            if (!QuorumPeerConfig.isReconfigEnabled()) {
                LOG.error("Reconfig operation requested but reconfig feature is disabled.");
                throw new KeeperException.ReconfigDisabledException();
            }
            if (skipACL) {
                LOG.warn("skipACL is set, reconfig operation will skip ACL checks!");
            }
            zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
            ReconfigRequest reconfigRequest = (ReconfigRequest) record;
            LeaderZooKeeperServer lzks;
            try {
                lzks = (LeaderZooKeeperServer) zks;
            } catch (ClassCastException e) {
                // standalone mode - reconfiguration currently not supported
                throw new KeeperException.UnimplementedException();
            }
            QuorumVerifier lastSeenQV = lzks.self.getLastSeenQuorumVerifier();
            // check that there's no reconfig in progress
            if (lastSeenQV.getVersion() != lzks.self.getQuorumVerifier().getVersion()) {
                throw new KeeperException.ReconfigInProgress();
            }
            long configId = reconfigRequest.getCurConfigId();
            if (configId != -1 && configId != lzks.self.getLastSeenQuorumVerifier().getVersion()) {
                String msg = "Reconfiguration from version " + configId + " failed -- last seen version is " + lzks.self.getLastSeenQuorumVerifier().getVersion();
                throw new KeeperException.BadVersionException(msg);
            }
            String newMembers = reconfigRequest.getNewMembers();
            if (newMembers != null) {
                //non-incremental membership change                  
                LOG.info("Non-incremental reconfig");
                // Input may be delimited by either commas or newlines so convert to common newline separated format
                newMembers = newMembers.replaceAll(",", "\n");
                try {
                    Properties props = new Properties();
                    props.load(new StringReader(newMembers));
                    request.qv = QuorumPeerConfig.parseDynamicConfig(props, lzks.self.getElectionType(), true, false);
                    request.qv.setVersion(request.getHdr().getZxid());
                } catch (IOException e) {
                    throw new KeeperException.BadArgumentsException(e.getMessage());
                } catch (ConfigException e) {
                    throw new KeeperException.BadArgumentsException(e.getMessage());
                }
            } else {
                //incremental change - must be a majority quorum system   
                LOG.info("Incremental reconfig");
                List<String> joiningServers = null;
                String joiningServersString = reconfigRequest.getJoiningServers();
                if (joiningServersString != null) {
                    joiningServers = StringUtils.split(joiningServersString, ",");
                }
                List<String> leavingServers = null;
                String leavingServersString = reconfigRequest.getLeavingServers();
                if (leavingServersString != null) {
                    leavingServers = StringUtils.split(leavingServersString, ",");
                }
                if (!(lastSeenQV instanceof QuorumMaj)) {
                    String msg = "Incremental reconfiguration requested but last configuration seen has a non-majority quorum system";
                    LOG.warn(msg);
                    throw new KeeperException.BadArgumentsException(msg);
                }
                Map<Long, QuorumServer> nextServers = new HashMap<Long, QuorumServer>(lastSeenQV.getAllMembers());
                try {
                    if (leavingServers != null) {
                        for (String leaving : leavingServers) {
                            long sid = Long.parseLong(leaving);
                            nextServers.remove(sid);
                        }
                    }
                    if (joiningServers != null) {
                        for (String joiner : joiningServers) {
                            // joiner should have the following format: server.x = server_spec;client_spec               
                            String[] parts = StringUtils.split(joiner, "=").toArray(new String[0]);
                            if (parts.length != 2) {
                                throw new KeeperException.BadArgumentsException("Wrong format of server string");
                            }
                            // extract server id x from first part of joiner: server.x
                            Long sid = Long.parseLong(parts[0].substring(parts[0].lastIndexOf('.') + 1));
                            QuorumServer qs = new QuorumServer(sid, parts[1]);
                            if (qs.clientAddr == null || qs.electionAddr == null || qs.addr == null) {
                                throw new KeeperException.BadArgumentsException("Wrong format of server string - each server should have 3 ports specified");
                            }
                            // check duplication of addresses and ports
                            for (QuorumServer nqs : nextServers.values()) {
                                if (qs.id == nqs.id) {
                                    continue;
                                }
                                qs.checkAddressDuplicate(nqs);
                            }
                            nextServers.remove(qs.id);
                            nextServers.put(Long.valueOf(qs.id), qs);
                        }
                    }
                } catch (ConfigException e) {
                    throw new KeeperException.BadArgumentsException("Reconfiguration failed");
                }
                request.qv = new QuorumMaj(nextServers);
                request.qv.setVersion(request.getHdr().getZxid());
            }
            if (QuorumPeerConfig.isStandaloneEnabled() && request.qv.getVotingMembers().size() < 2) {
                String msg = "Reconfig failed - new configuration must include at least 2 followers";
                LOG.warn(msg);
                throw new KeeperException.BadArgumentsException(msg);
            } else if (request.qv.getVotingMembers().size() < 1) {
                String msg = "Reconfig failed - new configuration must include at least 1 follower";
                LOG.warn(msg);
                throw new KeeperException.BadArgumentsException(msg);
            }
            if (!lzks.getLeader().isQuorumSynced(request.qv)) {
                String msg2 = "Reconfig failed - there must be a connected and synced quorum in new configuration";
                LOG.warn(msg2);
                throw new KeeperException.NewConfigNoQuorum();
            }
            nodeRecord = getRecordForPath(ZooDefs.CONFIG_NODE);
            checkACL(zks, request.cnxn, nodeRecord.acl, ZooDefs.Perms.WRITE, request.authInfo, null, null);
            request.setTxn(new SetDataTxn(ZooDefs.CONFIG_NODE, request.qv.toString().getBytes(), -1));
            nodeRecord = nodeRecord.duplicate(request.getHdr().getZxid());
            nodeRecord.stat.setVersion(-1);
            addChangeRecord(nodeRecord);
            break;
        case OpCode.setACL:
            zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
            SetACLRequest setAclRequest = (SetACLRequest) record;
            if (deserialize)
                ByteBufferInputStream.byteBuffer2Record(request.request, setAclRequest);
            path = setAclRequest.getPath();
            validatePath(path, request.sessionId);
            List<ACL> listACL = fixupACL(path, request.authInfo, setAclRequest.getAcl());
            nodeRecord = getRecordForPath(path);
            checkACL(zks, request.cnxn, nodeRecord.acl, ZooDefs.Perms.ADMIN, request.authInfo, path, listACL);
            newVersion = checkAndIncVersion(nodeRecord.stat.getAversion(), setAclRequest.getVersion(), path);
            request.setTxn(new SetACLTxn(path, listACL, newVersion));
            nodeRecord = nodeRecord.duplicate(request.getHdr().getZxid());
            nodeRecord.stat.setAversion(newVersion);
            addChangeRecord(nodeRecord);
            break;
        case OpCode.createSession:
            request.request.rewind();
            int to = request.request.getInt();
            request.setTxn(new CreateSessionTxn(to));
            request.request.rewind();
            if (request.isLocalSession()) {
                // This will add to local session tracker if it is enabled
                zks.sessionTracker.addSession(request.sessionId, to);
            } else {
                // Explicitly add to global session if the flag is not set
                zks.sessionTracker.addGlobalSession(request.sessionId, to);
            }
            zks.setOwner(request.sessionId, request.getOwner());
            break;
        case OpCode.closeSession:
            // We don't want to do this check since the session expiration thread
            // queues up this operation without being the session owner.
            // this request is the last of the session so it should be ok
            //zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
            Set<String> es = zks.getZKDatabase().getEphemerals(request.sessionId);
            synchronized (zks.outstandingChanges) {
                for (ChangeRecord c : zks.outstandingChanges) {
                    if (c.stat == null) {
                        // Doing a delete
                        es.remove(c.path);
                    } else if (c.stat.getEphemeralOwner() == request.sessionId) {
                        es.add(c.path);
                    }
                }
                for (String path2Delete : es) {
                    addChangeRecord(new ChangeRecord(request.getHdr().getZxid(), path2Delete, null, 0, null));
                }
                zks.sessionTracker.setSessionClosing(request.sessionId);
            }
            LOG.info("Processed session termination for sessionid: 0x" + Long.toHexString(request.sessionId));
            break;
        case OpCode.check:
            zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
            CheckVersionRequest checkVersionRequest = (CheckVersionRequest) record;
            if (deserialize)
                ByteBufferInputStream.byteBuffer2Record(request.request, checkVersionRequest);
            path = checkVersionRequest.getPath();
            validatePath(path, request.sessionId);
            nodeRecord = getRecordForPath(path);
            checkACL(zks, request.cnxn, nodeRecord.acl, ZooDefs.Perms.READ, request.authInfo, path, null);
            request.setTxn(new CheckVersionTxn(path, checkAndIncVersion(nodeRecord.stat.getVersion(), checkVersionRequest.getVersion(), path)));
            break;
        default:
            LOG.warn("unknown type " + type);
            break;
    }
}

Example 2 with CheckVersionTxn

use of org.apache.zookeeper.txn.CheckVersionTxn in project zookeeper by apache.

the class DataTree method processTxn.

public ProcessTxnResult processTxn(TxnHeader header, Record txn) {
    ProcessTxnResult rc = new ProcessTxnResult();
    try {
        rc.clientId = header.getClientId();
        rc.cxid = header.getCxid();
        rc.zxid = header.getZxid();
        rc.type = header.getType();
        rc.err = 0;
        rc.multiResult = null;
        switch(header.getType()) {
            case OpCode.create:
                CreateTxn createTxn = (CreateTxn) txn;
                rc.path = createTxn.getPath();
                createNode(createTxn.getPath(), createTxn.getData(), createTxn.getAcl(), createTxn.getEphemeral() ? header.getClientId() : 0, createTxn.getParentCVersion(), header.getZxid(), header.getTime(), null);
                break;
            case OpCode.create2:
                CreateTxn create2Txn = (CreateTxn) txn;
                rc.path = create2Txn.getPath();
                Stat stat = new Stat();
                createNode(create2Txn.getPath(), create2Txn.getData(), create2Txn.getAcl(), create2Txn.getEphemeral() ? header.getClientId() : 0, create2Txn.getParentCVersion(), header.getZxid(), header.getTime(), stat);
                rc.stat = stat;
                break;
            case OpCode.createTTL:
                CreateTTLTxn createTtlTxn = (CreateTTLTxn) txn;
                rc.path = createTtlTxn.getPath();
                stat = new Stat();
                createNode(createTtlTxn.getPath(), createTtlTxn.getData(), createTtlTxn.getAcl(), EphemeralType.ttlToEphemeralOwner(createTtlTxn.getTtl()), createTtlTxn.getParentCVersion(), header.getZxid(), header.getTime(), stat);
                rc.stat = stat;
                break;
            case OpCode.createContainer:
                CreateContainerTxn createContainerTxn = (CreateContainerTxn) txn;
                rc.path = createContainerTxn.getPath();
                stat = new Stat();
                createNode(createContainerTxn.getPath(), createContainerTxn.getData(), createContainerTxn.getAcl(), EphemeralType.CONTAINER_EPHEMERAL_OWNER, createContainerTxn.getParentCVersion(), header.getZxid(), header.getTime(), stat);
                rc.stat = stat;
                break;
            case OpCode.delete:
            case OpCode.deleteContainer:
                DeleteTxn deleteTxn = (DeleteTxn) txn;
                rc.path = deleteTxn.getPath();
                deleteNode(deleteTxn.getPath(), header.getZxid());
                break;
            case OpCode.reconfig:
            case OpCode.setData:
                SetDataTxn setDataTxn = (SetDataTxn) txn;
                rc.path = setDataTxn.getPath();
                rc.stat = setData(setDataTxn.getPath(), setDataTxn.getData(), setDataTxn.getVersion(), header.getZxid(), header.getTime());
                break;
            case OpCode.setACL:
                SetACLTxn setACLTxn = (SetACLTxn) txn;
                rc.path = setACLTxn.getPath();
                rc.stat = setACL(setACLTxn.getPath(), setACLTxn.getAcl(), setACLTxn.getVersion());
                break;
            case OpCode.closeSession:
                killSession(header.getClientId(), header.getZxid());
                break;
            case OpCode.error:
                ErrorTxn errTxn = (ErrorTxn) txn;
                rc.err = errTxn.getErr();
                break;
            case OpCode.check:
                CheckVersionTxn checkTxn = (CheckVersionTxn) txn;
                rc.path = checkTxn.getPath();
                break;
            case OpCode.multi:
                MultiTxn multiTxn = (MultiTxn) txn;
                List<Txn> txns = multiTxn.getTxns();
                rc.multiResult = new ArrayList<ProcessTxnResult>();
                boolean failed = false;
                for (Txn subtxn : txns) {
                    if (subtxn.getType() == OpCode.error) {
                        failed = true;
                        break;
                    }
                }
                boolean post_failed = false;
                for (Txn subtxn : txns) {
                    ByteBuffer bb = ByteBuffer.wrap(subtxn.getData());
                    Record record = null;
                    switch(subtxn.getType()) {
                        case OpCode.create:
                            record = new CreateTxn();
                            break;
                        case OpCode.createTTL:
                            record = new CreateTTLTxn();
                            break;
                        case OpCode.createContainer:
                            record = new CreateContainerTxn();
                            break;
                        case OpCode.delete:
                        case OpCode.deleteContainer:
                            record = new DeleteTxn();
                            break;
                        case OpCode.setData:
                            record = new SetDataTxn();
                            break;
                        case OpCode.error:
                            record = new ErrorTxn();
                            post_failed = true;
                            break;
                        case OpCode.check:
                            record = new CheckVersionTxn();
                            break;
                        default:
                            throw new IOException("Invalid type of op: " + subtxn.getType());
                    }
                    assert (record != null);
                    ByteBufferInputStream.byteBuffer2Record(bb, record);
                    if (failed && subtxn.getType() != OpCode.error) {
                        int ec = post_failed ? Code.RUNTIMEINCONSISTENCY.intValue() : Code.OK.intValue();
                        subtxn.setType(OpCode.error);
                        record = new ErrorTxn(ec);
                    }
                    if (failed) {
                        assert (subtxn.getType() == OpCode.error);
                    }
                    TxnHeader subHdr = new TxnHeader(header.getClientId(), header.getCxid(), header.getZxid(), header.getTime(), subtxn.getType());
                    ProcessTxnResult subRc = processTxn(subHdr, record);
                    rc.multiResult.add(subRc);
                    if (subRc.err != 0 && rc.err == 0) {
                        rc.err = subRc.err;
                    }
                }
                break;
        }
    } catch (KeeperException e) {
        if (LOG.isDebugEnabled()) {
            LOG.debug("Failed: " + header + ":" + txn, e);
        }
        rc.err = e.code().intValue();
    } catch (IOException e) {
        if (LOG.isDebugEnabled()) {
            LOG.debug("Failed: " + header + ":" + txn, e);
        }
    }
    /*
         * A snapshot might be in progress while we are modifying the data
         * tree. If we set lastProcessedZxid prior to making corresponding
         * change to the tree, then the zxid associated with the snapshot
         * file will be ahead of its contents. Thus, while restoring from
         * the snapshot, the restore method will not apply the transaction
         * for zxid associated with the snapshot file, since the restore
         * method assumes that transaction to be present in the snapshot.
         *
         * To avoid this, we first apply the transaction and then modify
         * lastProcessedZxid.  During restore, we correctly handle the
         * case where the snapshot contains data ahead of the zxid associated
         * with the file.
         */
    if (rc.zxid > lastProcessedZxid) {
        lastProcessedZxid = rc.zxid;
    }
    /*
         * Snapshots are taken lazily. It can happen that the child
         * znodes of a parent are created after the parent
         * is serialized. Therefore, while replaying logs during restore, a
         * create might fail because the node was already
         * created.
         *
         * After seeing this failure, we should increment
         * the cversion of the parent znode since the parent was serialized
         * before its children.
         *
         * Note, such failures on DT should be seen only during
         * restore.
         */
    if (header.getType() == OpCode.create && rc.err == Code.NODEEXISTS.intValue()) {
        LOG.debug("Adjusting parent cversion for Txn: " + header.getType() + " path:" + rc.path + " err: " + rc.err);
        int lastSlash = rc.path.lastIndexOf('/');
        String parentName = rc.path.substring(0, lastSlash);
        CreateTxn cTxn = (CreateTxn) txn;
        try {
            setCversionPzxid(parentName, cTxn.getParentCVersion(), header.getZxid());
        } catch (KeeperException.NoNodeException e) {
            LOG.error("Failed to set parent cversion for: " + parentName, e);
            rc.err = e.code().intValue();
        }
    } else if (rc.err != Code.OK.intValue()) {
        LOG.debug("Ignoring processTxn failure hdr: " + header.getType() + " : error: " + rc.err);
    }
    return rc;
}