Github user rhtyd commented on a diff in the pull request: https://github.com/apache/cloudstack/pull/1502#discussion_r61845392 --- Diff: engine/schema/src/org/apache/cloudstack/outofbandmanagement/dao/OutOfBandManagementDaoImpl.java --- @@ -0,0 +1,163 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +package org.apache.cloudstack.outofbandmanagement.dao; + +import com.cloud.utils.DateUtil; +import com.cloud.utils.db.Attribute; +import com.cloud.utils.db.DB; +import com.cloud.utils.db.Filter; +import com.cloud.utils.db.GenericDaoBase; +import com.cloud.utils.db.SearchBuilder; +import com.cloud.utils.db.SearchCriteria; +import com.cloud.utils.db.TransactionLegacy; +import com.cloud.utils.db.UpdateBuilder; +import com.cloud.utils.exception.CloudRuntimeException; +import org.apache.cloudstack.outofbandmanagement.OutOfBandManagement; +import org.apache.cloudstack.outofbandmanagement.OutOfBandManagementVO; +import org.apache.log4j.Logger; +import org.springframework.stereotype.Component; + +import javax.ejb.Local; +import java.sql.PreparedStatement; +import java.sql.SQLException; +import java.util.List; + +@DB +@Component +@Local(value = {OutOfBandManagementDao.class}) +public class OutOfBandManagementDaoImpl extends GenericDaoBase<OutOfBandManagementVO, Long> implements OutOfBandManagementDao { + private static final Logger LOG = Logger.getLogger(OutOfBandManagementDaoImpl.class); + + private SearchBuilder<OutOfBandManagementVO> HostSearch; + private SearchBuilder<OutOfBandManagementVO> ManagementServerSearch; + private SearchBuilder<OutOfBandManagementVO> OutOfBandManagementOwnerSearch; + private SearchBuilder<OutOfBandManagementVO> StateUpdateSearch; + + private Attribute PowerStateAttr; + private Attribute MsIdAttr; + private Attribute UpdateTimeAttr; + + public OutOfBandManagementDaoImpl() { + super(); + + HostSearch = createSearchBuilder(); + HostSearch.and("hostId", HostSearch.entity().getHostId(), SearchCriteria.Op.EQ); + HostSearch.done(); + + ManagementServerSearch = createSearchBuilder(); + ManagementServerSearch.and("server", ManagementServerSearch.entity().getManagementServerId(), SearchCriteria.Op.EQ); + ManagementServerSearch.done(); + + OutOfBandManagementOwnerSearch = createSearchBuilder(); + OutOfBandManagementOwnerSearch.and("server", OutOfBandManagementOwnerSearch.entity().getManagementServerId(), SearchCriteria.Op.EQ); + OutOfBandManagementOwnerSearch.or("serverNull", OutOfBandManagementOwnerSearch.entity().getManagementServerId(), SearchCriteria.Op.NULL); + OutOfBandManagementOwnerSearch.done(); + + StateUpdateSearch = createSearchBuilder(); + StateUpdateSearch.and("status", StateUpdateSearch.entity().getPowerState(), SearchCriteria.Op.EQ); + StateUpdateSearch.and("id", StateUpdateSearch.entity().getId(), SearchCriteria.Op.EQ); + StateUpdateSearch.and("update", StateUpdateSearch.entity().getUpdateCount(), SearchCriteria.Op.EQ); + StateUpdateSearch.done(); + + PowerStateAttr = _allAttributes.get("powerState"); + MsIdAttr = _allAttributes.get("managementServerId"); + UpdateTimeAttr = _allAttributes.get("updateTime"); + assert (PowerStateAttr != null && MsIdAttr != null && UpdateTimeAttr != null) : "Couldn't find one of these attributes"; + } + + @Override + public OutOfBandManagement findByHost(long hostId) { + SearchCriteria<OutOfBandManagementVO> sc = HostSearch.create("hostId", hostId); + return findOneBy(sc); + } + + @Override + public List<OutOfBandManagementVO> findAllByManagementServer(long serverId) { + SearchCriteria<OutOfBandManagementVO> sc = OutOfBandManagementOwnerSearch.create(); + sc.setParameters("server", serverId); + return listBy(sc, new Filter(OutOfBandManagementVO.class, "updateTime", true, null, null)); + } + + private void executeExpireOwnershipSql(final String sql, long resource) { + TransactionLegacy txn = TransactionLegacy.currentTxn(); + try { + txn.start(); + PreparedStatement pstmt = txn.prepareAutoCloseStatement(sql); + pstmt.setLong(1, resource); + pstmt.executeUpdate(); + txn.commit(); + } catch (SQLException e) { + txn.rollback(); + throw new CloudRuntimeException("Unable to reset out-of-band management ownership based on resource:" + resource); + } + } + + @Override + public void expireOutOfBandManagementOwnershipByHours(long hours) { + final String resetOwnerSql = "UPDATE oobm set mgmt_server_id=NULL where update_time<= (NOW() - INTERVAL ? HOUR)"; + executeExpireOwnershipSql(resetOwnerSql, hours); + } + + @Override + public void expireOutOfBandManagementOwnershipByServer(long serverId) { + final String resetOwnerSql = "UPDATE oobm set mgmt_server_id=NULL, power_state=NULL where mgmt_server_id=?"; + executeExpireOwnershipSql(resetOwnerSql, serverId); + if (LOG.isDebugEnabled()) { + LOG.debug("Expired out-of-band management ownership for hosts owned by management server id:" + serverId); + } + } + + @Override + public boolean updateState(OutOfBandManagement.PowerState oldStatus, OutOfBandManagement.PowerState.Event event, OutOfBandManagement.PowerState newStatus, OutOfBandManagement vo, Object data) { + // lock target row from beginning to avoid lock-promotion caused deadlock + OutOfBandManagementVO oobmHost = lockRow(vo.getId(), true); + if (oobmHost == null) { + if (LOG.isTraceEnabled()) { + LOG.trace("Failed to lock row to update state for out-of-band management host id: " + vo.getHostId()); + } + return false; + } + + Long newManagementServerId = event.getServerId(); + // Avoid updates when old ownership and state are same as new + if (oldStatus == newStatus && (oobmHost.getManagementServerId() != null && oobmHost.getManagementServerId().equals(newManagementServerId))) { + return false; + } + + if (event == OutOfBandManagement.PowerState.Event.Disabled) { + newManagementServerId = null; + } + + SearchCriteria<OutOfBandManagementVO> sc = StateUpdateSearch.create(); + sc.setParameters("status", oldStatus); + sc.setParameters("id", oobmHost.getId()); + sc.setParameters("update", oobmHost.getUpdateCount()); + + oobmHost.incrUpdateCount(); --- End diff -- It's not a pessimistic lock, lockRows uses a `for update` http://dev.mysql.com/doc/refman/5.7/en/innodb-locking-reads.html While incrUpdateCount uses a state based update counter CRDT https://en.wikipedia.org/wiki/Conflict-free_replicated_data_type#State-based_increment-only_counter
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