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TConnection.java
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TConnection.java
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/*
* Copyright [2013-2021], Alibaba Group Holding Limited
*
* Licensed 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 com.alibaba.polardbx.matrix.jdbc;
import com.alibaba.polardbx.common.TrxIdGenerator;
import com.alibaba.polardbx.common.constants.TransactionAttribute;
import com.alibaba.polardbx.common.exception.NotSupportException;
import com.alibaba.polardbx.common.exception.TddlRuntimeException;
import com.alibaba.polardbx.common.exception.code.ErrorCode;
import com.alibaba.polardbx.common.jdbc.BatchInsertPolicy;
import com.alibaba.polardbx.common.jdbc.IConnection;
import com.alibaba.polardbx.common.jdbc.IDataSource;
import com.alibaba.polardbx.common.jdbc.ITransactionPolicy;
import com.alibaba.polardbx.common.jdbc.ITransactionPolicy.TransactionClass;
import com.alibaba.polardbx.common.jdbc.ParameterContext;
import com.alibaba.polardbx.common.jdbc.Parameters;
import com.alibaba.polardbx.common.jdbc.ShareReadViewPolicy;
import com.alibaba.polardbx.common.lock.LockingFunctionHandle;
import com.alibaba.polardbx.common.lock.LockingFunctionManager;
import com.alibaba.polardbx.common.model.DbPriv;
import com.alibaba.polardbx.common.model.hint.DirectlyRouteCondition;
import com.alibaba.polardbx.common.properties.ConnectionParams;
import com.alibaba.polardbx.common.properties.ConnectionProperties;
import com.alibaba.polardbx.common.utils.ExecutorMode;
import com.alibaba.polardbx.common.utils.GeneralUtil;
import com.alibaba.polardbx.common.utils.Pair;
import com.alibaba.polardbx.common.utils.logger.Logger;
import com.alibaba.polardbx.common.utils.logger.LoggerFactory;
import com.alibaba.polardbx.common.utils.thread.ServerThreadPool;
import com.alibaba.polardbx.common.utils.timezone.InternalTimeZone;
import com.alibaba.polardbx.config.ConfigDataMode;
import com.alibaba.polardbx.druid.sql.parser.ByteString;
import com.alibaba.polardbx.executor.InsertSplitter;
import com.alibaba.polardbx.executor.PlanExecutor;
import com.alibaba.polardbx.executor.common.ExecutorContext;
import com.alibaba.polardbx.executor.common.StorageInfoManager;
import com.alibaba.polardbx.executor.cursor.Cursor;
import com.alibaba.polardbx.executor.cursor.MultiResultCursor;
import com.alibaba.polardbx.executor.cursor.ResultCursor;
import com.alibaba.polardbx.executor.cursor.impl.AffectRowCursor;
import com.alibaba.polardbx.executor.cursor.impl.ArrayResultCursor;
import com.alibaba.polardbx.executor.gsi.GsiUtils;
import com.alibaba.polardbx.executor.mdl.MdlContext;
import com.alibaba.polardbx.executor.mdl.MdlRequest;
import com.alibaba.polardbx.executor.spi.IGroupExecutor;
import com.alibaba.polardbx.executor.spi.ITransactionManager;
import com.alibaba.polardbx.executor.utils.PolarPrivilegeUtils;
import com.alibaba.polardbx.group.utils.GroupHintParser;
import com.alibaba.polardbx.matrix.jdbc.utils.ByteStringUtil;
import com.alibaba.polardbx.matrix.jdbc.utils.ExceptionUtils;
import com.alibaba.polardbx.matrix.jdbc.utils.MergeHashMap;
import com.alibaba.polardbx.optimizer.OptimizerContext;
import com.alibaba.polardbx.optimizer.PlannerContext;
import com.alibaba.polardbx.optimizer.ccl.CclManager;
import com.alibaba.polardbx.optimizer.config.schema.InformationSchema;
import com.alibaba.polardbx.optimizer.config.schema.MysqlSchema;
import com.alibaba.polardbx.optimizer.config.schema.PerformanceSchema;
import com.alibaba.polardbx.optimizer.config.table.ScaleOutPlanUtil;
import com.alibaba.polardbx.optimizer.config.table.TableMeta;
import com.alibaba.polardbx.optimizer.context.ExecutionContext;
import com.alibaba.polardbx.optimizer.context.MultiDdlContext;
import com.alibaba.polardbx.optimizer.core.datatype.DataTypes;
import com.alibaba.polardbx.optimizer.core.planner.ExecutionPlan;
import com.alibaba.polardbx.optimizer.core.planner.Planner;
import com.alibaba.polardbx.optimizer.core.rel.BroadcastTableModify;
import com.alibaba.polardbx.optimizer.core.rel.DirectTableOperation;
import com.alibaba.polardbx.optimizer.core.rel.LogicalInsert;
import com.alibaba.polardbx.optimizer.core.rel.LogicalModifyView;
import com.alibaba.polardbx.optimizer.core.rel.SingleTableOperation;
import com.alibaba.polardbx.optimizer.core.rel.ddl.BaseDdlOperation;
import com.alibaba.polardbx.optimizer.parse.privilege.PrivilegeContext;
import com.alibaba.polardbx.optimizer.planmanager.BaselineInfo;
import com.alibaba.polardbx.optimizer.planmanager.PlanInfo;
import com.alibaba.polardbx.optimizer.planmanager.PlanManager;
import com.alibaba.polardbx.optimizer.planmanager.PreparedStmtCache;
import com.alibaba.polardbx.optimizer.statis.SQLTracer;
import com.alibaba.polardbx.optimizer.utils.ExecutionPlanProperties;
import com.alibaba.polardbx.optimizer.utils.FailureInjectionFlag;
import com.alibaba.polardbx.optimizer.utils.IConnectionHolder;
import com.alibaba.polardbx.optimizer.utils.IDistributedTransaction;
import com.alibaba.polardbx.optimizer.utils.ITransaction;
import com.alibaba.polardbx.optimizer.utils.InventoryMode;
import com.alibaba.polardbx.repo.mysql.cursor.ResultSetCursor;
import com.alibaba.polardbx.statistics.RuntimeStatHelper;
import com.alibaba.polardbx.statistics.RuntimeStatistics;
import com.alibaba.polardbx.statistics.SQLRecorderLogger;
import com.alibaba.polardbx.transaction.ITsoTransaction;
import com.alibaba.polardbx.transaction.ReadOnlyTsoTransaction;
import org.apache.calcite.rel.AbstractRelNode;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.sql.OptimizerHint;
import org.apache.calcite.sql.SqlKind;
import org.apache.commons.lang.BooleanUtils;
import org.apache.commons.lang.StringUtils;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.sql.Array;
import java.sql.Blob;
import java.sql.CallableStatement;
import java.sql.Clob;
import java.sql.DatabaseMetaData;
import java.sql.NClob;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLClientInfoException;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.SQLXML;
import java.sql.Savepoint;
import java.sql.Statement;
import java.sql.Struct;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.BitSet;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.concurrent.Executor;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.locks.ReentrantLock;
import static com.alibaba.polardbx.common.utils.GeneralUtil.unixTimeStamp;
import static com.alibaba.polardbx.optimizer.utils.ExecutionPlanProperties.DDL_STATEMENT;
import static com.alibaba.polardbx.optimizer.utils.ExecutionPlanProperties.MDL_REQUIRED;
import static com.alibaba.polardbx.optimizer.utils.ExecutionPlanProperties.MDL_REQUIRED_POLARDBX;
import static com.alibaba.polardbx.optimizer.utils.ExecutionPlanProperties.MODIFY_TABLE;
import static org.apache.calcite.sql.OptimizerHint.COMMIT_ON_SUCCESS;
import static org.apache.calcite.sql.OptimizerHint.ROLLBACK_ON_FAIL;
import static org.apache.calcite.sql.OptimizerHint.TARGET_AFFECT_ROW;
import static org.apache.calcite.sql.SqlKind.UPDATE;
/**
* @author mengshi.sunmengshi 2013-11-22 下午3:26:06
* @since 5.0.0
*/
public class TConnection implements IConnection {
protected final static Logger logger = LoggerFactory.getLogger(TConnection.class);
private PlanExecutor executor = null;
private final TDataSource dataSource;
private ExecutionContext executionContext = new ExecutionContext(); // 记录上一次的执行上下文
private final List<TStatement> openedStatements = new ArrayList<TStatement>(2);
private boolean isAutoCommit = true; // jdbc规范，新连接为true
private boolean readOnly = false;
private volatile boolean closed;
private int transactionIsolation = -1;
private final ServerThreadPool executorService;
private ITransactionPolicy trxPolicy = null;
// Only set by ServerConnection. For users, it's set by
// "set batch_insert_policy='split'"
// Null stands for not set by this connection, and the policy depends on
// instance property.
private BatchInsertPolicy batchInsertPolicy = null;
private long lastExecutionBeginNano = -1;
private long lastExecutionBeginUnixTime = -1;
/**
* 管理这个连接下用到的所有物理连接
*/
private long lastInsertId;
// last_insert_id for "getGeneratedKeys" is not necessarily the same as
// last_insert_id for "select LAST_INSERT_ID()".
private long returnedLastInsertId;
private String encoding = null;
private String sqlMode = null;
private List<Long> generatedKeys = Collections.synchronizedList(new ArrayList<Long>());
private ITransaction trx;
/**
* 保存 select sql_calc_found_rows 返回的结果
*/
private long foundRows = 0;
/**
* Store the result of ROW_COUNT()
*/
private long affectedRows = 0;
private SQLTracer tracer;
private int socketTimeout = -1;
private final ReentrantLock lock = new ReentrantLock();
// 下推到下层的系统变量，全部小写
private Map<String, Object> serverVariables = null;
// 下推到下层的全局系统变量，全部小写
private Map<String, Object> globalServerVariables = null;
// 用户定义的变量，全部小写
private Map<String, Object> userDefVariables = null;
// 特殊处理的系统变量以及自定义的系统变量，全部小写
private Map<String, Object> extraServerVariables = null;
// ConnectionParams 中支持的其他系统变量，全部大写
private Map<String, Object> connectionVariables = null;
private String user = null;
private MdlContext mdlContext = null;
private String frontendConnectionInfo = null;
private InternalTimeZone logicalTimeZone = null;
/**
* 和show processlist里显示的ID一致，用于生成mpp的QueryId
*/
private long id;
/**
* 分布式锁是连接级别（会话级别）
*/
private LockingFunctionHandle lockHandle;
private String traceId;
/**
* FIXME @jinwu for ShareReadView
*/
private ShareReadViewPolicy shareReadView = ShareReadViewPolicy.DEFAULT;
/**
* whether the current statement is a DDL
*/
private boolean ddlStatement;
public void setDdlStatement(boolean ddlStatement) {
this.ddlStatement = ddlStatement;
}
public boolean isDdlStatement() {
return ddlStatement;
}
public TConnection(TDataSource ds) {
this.dataSource = ds;
this.executor = ds.getExecutor();
this.executorService = ds.borrowExecutorService();
this.logicalTimeZone = ds.getLogicalDbTimeZone();
/**
* FIXME @jinwu for ShareReadView
*/
this.shareReadView = dnSupportShareReadView() ? ShareReadViewPolicy.ON : ShareReadViewPolicy.OFF;
}
public boolean getShareReadView() {
return shareReadView == ShareReadViewPolicy.ON;
}
private ITransactionPolicy loadTrxPolicy(ExecutionContext executionContext) {
ExecutorContext executorContext = dataSource.getConfigHolder().getExecutorContext();
StorageInfoManager storageManager = executorContext.getStorageInfoManager();
ITransactionManager transactionManager = executorContext.getTransactionManager();
// Use transaction from schema config
String policyName = executionContext.getParamManager().getString(ConnectionParams.TRANSACTION_POLICY);
ITransactionPolicy policy = ITransactionPolicy.of(policyName);
// Use default policy
if (policy == null) {
policy = transactionManager.getDefaultDistributedTrxPolicy(executionContext);
if (policy == null) {
policy = TransactionAttribute.DEFAULT_TRANSACTION_POLICY_MYSQL56;
}
}
this.trxPolicy = policy;
if (storageManager.isReadOnly() && (trxPolicy == ITransactionPolicy.XA)) {
throw new TddlRuntimeException(ErrorCode.ERR_TRANS,
"Distributed transaction is not supported in read-only PolarDB-X instances");
}
return trxPolicy;
}
private void loadShareReadView(ExecutionContext executionContext) {
if (executionContext.getParamManager().getBoolean(ConnectionParams.SHARE_READ_VIEW)) {
if (dnSupportShareReadView() && ShareReadViewPolicy.supportTxIsolation(transactionIsolation)) {
this.shareReadView = ShareReadViewPolicy.ON;
} else {
this.shareReadView = ShareReadViewPolicy.OFF;
}
} else {
this.shareReadView = ShareReadViewPolicy.OFF;
}
}
/**
* 执行sql语句的逻辑
*/
public ResultSet executeSQL(ByteString sql, Parameters params, TStatement stmt,
ExecutionContext executionContext) throws SQLException {
OptimizerContext.setContext(this.dataSource.getConfigHolder().getOptimizerContext());
try {
int trace = findTraceIndex(sql);
if (trace > 0) {
sql = sql.slice(trace);
this.tracer = new SQLTracer();
executionContext.setEnableTrace(true);
} else {
executionContext.setEnableTrace(false);
}
executionContext.setTracer(this.tracer);
returnedLastInsertId = 0;
this.generatedKeys.clear();
ResultCursor resultCursor;
ResultSet rs = null;
MergeHashMap<String, Object> extraCmd = new MergeHashMap<>(dataSource.getConnectionProperties());
if (connectionVariables != null) {
extraCmd.putAll(connectionVariables);
}
buildExtraCommand(sql, extraCmd);
if (serverVariables == null) {
serverVariables = new HashMap<String, Object>();
}
if (globalServerVariables == null) {
globalServerVariables = new HashMap<String, Object>();
}
if (userDefVariables == null) {
userDefVariables = new HashMap<String, Object>();
}
if (extraServerVariables == null) {
extraServerVariables = new HashMap<String, Object>();
}
// set binlog_rows_query_log_events
String binlogQueryLogConfig =
executionContext.getParamManager().getString(ConnectionParams.BINLOG_ROWS_QUERY_LOG_EVENTS);
if (StringUtils.isEmpty(binlogQueryLogConfig)) {
serverVariables.remove(ConnectionProperties.BINLOG_ROWS_QUERY_LOG_EVENTS.toLowerCase());
} else {
serverVariables.put(ConnectionProperties.BINLOG_ROWS_QUERY_LOG_EVENTS.toLowerCase(),
BooleanUtils.toBoolean(binlogQueryLogConfig.trim()) ? "ON" : "OFF");
}
// 设置逻辑库默认时区
if (logicalTimeZone != null) {
setTimeZoneVariable(serverVariables);
}
// 从连接属性中加载dbPriv，只要配了就覆盖其他渠道
loadDbPriv(executionContext);
// 处理下group hint
String groupHint = GroupHintParser.extractTDDLGroupHint(sql);
if (StringUtils.isNotEmpty(groupHint)) {
OptimizerContext.getContext(executionContext.getSchemaName()).getStatistics().hintCount++;
sql = GroupHintParser.removeTddlGroupHint(sql);
executionContext.setGroupHint(GroupHintParser.buildTddlGroupHint(groupHint));
} else {
executionContext.setGroupHint(null);
}
executionContext.setAppName(dataSource.getAppName());
executionContext.setSchemaName(dataSource.getSchemaName());
executionContext.setExecutorService(executorService);
executionContext.setParams(params);
executionContext.setSql(sql);
executionContext.setExtraCmds(extraCmd);
executionContext.setTxIsolation(transactionIsolation);
executionContext.setSqlMode(sqlMode);
executionContext.setServerVariables(serverVariables);
executionContext.setExtraServerVariables(extraServerVariables);
executionContext.setUserDefVariables(userDefVariables);
executionContext.setEncoding(encoding);
executionContext.setConnection(this);
executionContext.setStressTestValid(dataSource.isStressTestValid());
executionContext.setSocketTimeout(socketTimeout);
executionContext.setModifySelect(false);
executionContext.setTimeZone(this.logicalTimeZone);
executionContext.getPrivilegeVerifyItems().clear();
if (executionContext.isInternalSystemSql()) {
/**
* When the sql is labeled as internal system sql of drds, the
* traceId that is get by executionContext.getContextId() has
* been invalid （its val is null or the residual traceId of last
* sql ), so the traceId must be reset by geting new traceId.
*/
String internSqlTraceId = Long.toHexString(TrxIdGenerator.getInstance().nextId());
executionContext.setTraceId(internSqlTraceId);
executionContext.setPhySqlId(0L);
}
executionContext.setRuntimeStatistics(RuntimeStatHelper.buildRuntimeStat(executionContext));
if (this.trx == null || this.trx.isClosed()) {
beginTransaction();
} else {
// In some cases, the transaction can't continue. Rollback
// statement walks rollback(), not here.
trx.checkCanContinue();
}
executionContext.setTransaction(trx);
Throwable exOfResultCursor = null;
try {
AtomicBoolean trxPolicyModified = new AtomicBoolean(false);
BatchInsertPolicy policy = getBatchInsertPolicy(extraCmd);
if (InsertSplitter.needSplit(sql, policy, executionContext)) {
executionContext.setDoingBatchInsertBySpliter(true);
InsertSplitter insertSplitter = new InsertSplitter();
// In batch insert, update transaction policy in writing broadcast table is also needed.
resultCursor = insertSplitter.execute(sql,
executionContext,
policy,
(ByteString s) -> executeQuery(s, executionContext, trxPolicyModified),
(ByteString s) -> executeQuery(s, executionContext, null));
} else {
resultCursor = executeQuery(sql, executionContext, trxPolicyModified);
}
if (trxPolicyModified.get()) {
this.trxPolicy = null;
}
} catch (Throwable e) {
if (isRollbackOnFail()) {
rollback();
}
// 这里是优化器的异常
exOfResultCursor = e;
boolean collectSqlErrorInfo = executionContext.getParamManager().getBoolean(
ConnectionParams.COLLECT_SQL_ERROR_INFO);
if (collectSqlErrorInfo) {
resultCursor = buildSqlErrorInfoCursor(e, sql.toString());
} else {
throw GeneralUtil.nestedException(e);
}
}
if (isCommitOnSuccess()) {
commit();
}
if (resultCursor instanceof ResultSetCursor) {
rs = ((ResultSetCursor) resultCursor).getResultSet();
} else if (resultCursor instanceof MultiResultCursor) {
rs = new TMultiResultSet((MultiResultCursor) resultCursor, extraCmd);
} else {
rs = new TResultSet(resultCursor, extraCmd);
}
if (exOfResultCursor == null) {
boolean collectSqlErrorInfo =
executionContext.getParamManager().getBoolean(ConnectionParams.COLLECT_SQL_ERROR_INFO);
if (collectSqlErrorInfo) {
Throwable exOfRs = null;
try {
// 这里有可能产生执行器的异常
rs.next();
} catch (Throwable e) {
exOfRs = e;
} finally {
if (rs != null) {
rs.close();
}
}
resultCursor = buildSqlErrorInfoCursor(exOfRs, sql.toString());
rs = new TResultSet(resultCursor, extraCmd);
}
}
return rs;
} catch (Throwable e) {
throw GeneralUtil.nestedException(e);
} finally {
if (trx != null && trx.getInventoryMode() != null) {
trx.getInventoryMode().resetInventoryMode();
}
}
}
private static final String TRACE = "trace ";
private static int findTraceIndex(ByteString sql) {
int i = 0;
for (; i < sql.length(); ++i) {
switch (sql.charAt(i)) {
case ' ':
case '\t':
case '\r':
case '\n':
continue;
}
break;
}
if (sql.regionMatches(true, i, TRACE, 0, TRACE.length())) {
return i + TRACE.length();
} else {
return -1;
}
}
/**
* Separate execute(sql, ec) into two parts: plan and execute. If it's
* writing into broadcast table and has no transaction, a new transaction
* will be open.
*/
private ResultCursor executeQuery(ByteString sql, ExecutionContext executionContext,
AtomicBoolean trxPolicyModified) {
if (null == executionContext.getParams()) {
executionContext.setParams(new Parameters());
}
// Get all meta version before optimization
final long[] metaVersions = MdlContext.snapshotMetaVersions();
final Parameters originParams = executionContext.getParams().clone();
ExecutionPlan plan = Planner.getInstance().plan(sql, executionContext);
// [mysql behavior]
// comment can be executed, sql example : "-- I can execute"
if (plan == null) {
return new ResultCursor(new AffectRowCursor(0));
}
this.lastExecutionBeginNano = System.nanoTime();
this.lastExecutionBeginUnixTime = unixTimeStamp();
this.setDdlStatement(plan.is(DDL_STATEMENT));
if (!isAutoCommit && this.isDdlStatement()) {
try {
// DDL statement causes an implicit commit
commit();
// Attention: the current txid has been 'used' so we need to generate one
executionContext.setTxId(0L);
// Start an auto-commit transaction ONLY for this DDL statement
beginTransaction(true);
executionContext.setTransaction(trx);
executionContext.setAutoCommit(true);
} catch (SQLException ex) {
throw new RuntimeException("Failed to commit transaction implicitly", ex);
}
}
// If parameter 'trxPolicyModified' is provided,
// Update transaction policy for modify of broadcast table and
// of table with global secondary index
if (trxPolicyModified != null) {
trxPolicyModified.set(updateTransactionAndConcurrentPolicy(plan, executionContext));
}
final boolean enableMdl = executionContext.getParamManager().getBoolean(ConnectionParams.ENABLE_MDL);
// For DML, meta data must not be modified after optimization and before mdl acquisition
final boolean requireMdl;
requireMdl = plan.is(MDL_REQUIRED_POLARDBX);
// For test purpose
final boolean testRebuild = executionContext.getParamManager().getBoolean(ConnectionParams.ALWAYS_REBUILD_PLAN);
if (requireMdl && enableMdl) {
if (!isClosed()) {
// Acquire meta data lock for each statement modifies table data
acquireTransactionalMdl(sql.toString(), plan, executionContext);
}
if (isClosed()) {
// TConnection already closed before execute
releaseTransactionalMdl(executionContext);
}
// If any meta is modified during optimization, rebuild plan
if (metaVersionChanged(plan, metaVersions, executionContext) || testRebuild) {
if (originParams.getBatchSize() <= 0 && GeneralUtil.isEmpty(originParams.getFirstParameter())) {
// Resume empty parameters for insert
executionContext.setParams(originParams);
}
plan = rebuildPlan(sql, executionContext);
// Update transaction policy for modify of broadcast table and
// of table with global secondary index
if (trxPolicyModified != null) {
trxPolicyModified.set(updateTransactionAndConcurrentPolicy(plan, executionContext));
}
}
}
if (trx instanceof IDistributedTransaction) {
checkTransactionParams((IDistributedTransaction) trx, executionContext);
} else {
final boolean forceCheckTrx = executionContext.getParamManager().getBoolean(
ConnectionParams.DISTRIBUTED_TRX_REQUIRED);
if (forceCheckTrx) {
throw new TddlRuntimeException(ErrorCode.ERR_TRANS_DISTRIBUTED_TRX_REQUIRED);
}
}
if (trx instanceof ReadOnlyTsoTransaction && plan.getPlanProperties().get(MODIFY_TABLE)) {
throw new TddlRuntimeException(ErrorCode.ERR_TRANS_CANNOT_EXECUTE_IN_RO_TRX);
}
if (trx instanceof ITsoTransaction && !plan.getTableSet().isEmpty()) {
// Update read ts for READ-COMMITTED isolation level
((ITsoTransaction) trx).updateSnapshotTimestamp();
}
executionContext.setFinalPlan(plan);
PolarPrivilegeUtils.checkPrivilege(plan, executionContext);
ScaleOutPlanUtil.checkDDLPermission(plan, executionContext);
invalidInventoryMode(plan);
if (executionContext.getCclContext() == null) {
CclManager.getService().begin(executionContext);
}
ResultCursor resultCursor = executor.execute(plan, executionContext);
updateTableStatistic(plan, resultCursor, executionContext);
return resultCursor;
}
private void invalidInventoryMode(ExecutionPlan executionPlan) {
trx.setInventoryMode(null);
if (executionPlan == null) {
return;
}
final RelNode plan = executionPlan.getPlan();
if (plan == null) {
return;
}
if (plan instanceof AbstractRelNode) {
final OptimizerHint hintContext = ((AbstractRelNode) plan).getHintContext();
if (hintContext != null && trx != null) {
InventoryMode inventoryMode = new InventoryMode();
if (hintContext.containsHint(COMMIT_ON_SUCCESS)) {
inventoryMode.enableCommitOnSuccess();
}
if (hintContext.containsHint(ROLLBACK_ON_FAIL)) {
inventoryMode.enableRollbackOnFail();
}
if (hintContext.containsHint(TARGET_AFFECT_ROW)) {
inventoryMode.enableTargetAffectRow();
}
if (inventoryMode.isInventoryHint()) {
PlannerContext plannerContext = PlannerContext.getPlannerContext(plan);
if (plannerContext != null && plannerContext.getSqlKind() == UPDATE) {
if ((executionContext.isModifyCrossDb() || executionContext.isModifyBroadcastTable())) {
throw new TddlRuntimeException(ErrorCode.ERR_IVENTORY_HINT_NOT_SUPPORT_CROSS_SHARD,
"Inventory hint is not allowed when the transaction involves more than one group!");
}
} else {
throw new RuntimeException("Inventory hint can only be used within update!");
}
trx.setInventoryMode(inventoryMode);
}
}
}
}
private static void checkTransactionParams(IDistributedTransaction trx, ExecutionContext executionContext) {
// Check injected failure from hint (for test purpose)
String injectedFailure =
(String) executionContext.getExtraCmds().get(ConnectionProperties.FAILURE_INJECTION);
if (injectedFailure != null) {
trx.setFailureFlag(FailureInjectionFlag.parseString(injectedFailure));
}
}
private boolean metaVersionChanged(ExecutionPlan plan, long[] metaVersions,
ExecutionContext executionContext) {
if (executionContext.getSchemaManagers().values().stream().anyMatch(s -> s.isExpired())) {
return true;
} else {
return false;
}
}
private ExecutionPlan rebuildPlan(ByteString sql, ExecutionContext executionContext) {
SQLRecorderLogger.ddlLogger.warn(
MessageFormat.format("[{0}] Rebuild plan by meta data modified, SQL: {1} , Param: {2}",
executionContext.getTraceId(),
sql,
GsiUtils.rowToString(executionContext.getParams())));
executionContext.refreshTableMeta();
ExecutionPlan plan = Planner.getInstance().plan(sql, executionContext);
this.lastExecutionBeginNano = System.nanoTime();
this.lastExecutionBeginUnixTime = unixTimeStamp();
return plan;
}
public void feedBackPlan(Throwable ex, double executeTimeMs, List<Pair<Integer, ParameterContext>> params) {
if (executionContext.getExplain() != null) {
return;
}
ExecutionPlan plan = executionContext.getFinalPlan();
if (plan != null) { // only deal with plan not null
if (plan.getCacheKey() != null) {
OptimizerContext.getContext(executionContext.getSchemaName()).getPlanManager()
.feedBack(plan, ex,
((RuntimeStatistics) executionContext.getRuntimeStatistics()).toSketch(), executionContext);
}
}
}
public Pair<Integer, Integer> updatePlanManagementInfo(long lastExecuteUnixTime,
double executionTimeInSeconds, Throwable ex) {
if (!executionContext.getParamManager().getBoolean(ConnectionParams.ENABLE_SPM)) {
return null;
}
if (executionContext.getExplain() != null) {
return null;
}
if (!ConfigDataMode.isMasterMode()) {
return null;
}
ExecutionPlan executionPlan = executionContext.getFinalPlan();
if (executionPlan != null) { // only deal with plan not null
RelNode plan = executionPlan.getPlan();
PlannerContext plannerContext = PlannerContext.getPlannerContext(plan);
BaselineInfo baselineInfo = plannerContext.getBaselineInfo();
PlanInfo planInfo = plannerContext.getPlanInfo();
PlanManager planManager = OptimizerContext.getContext(executionContext.getSchemaName()).getPlanManager();
if (planInfo != null && baselineInfo != null && planManager != null) {
synchronized (baselineInfo) {
planManager.doEvolution(baselineInfo, planInfo, lastExecuteUnixTime, executionTimeInSeconds, ex);
return new Pair<>(baselineInfo.getId(), planInfo.getId());
}
}
}
return null;
}
private void updateTableStatistic(ExecutionPlan executionPlan, ResultCursor resultCursor,
ExecutionContext executionContext) {
if (!executionContext.getParamManager().getBoolean(ConnectionParams.ENABLE_STATISTIC_FEEDBACK)) {
return;
}
if (executionContext.getExplain() != null) {
return;
}
RelNode plan = executionPlan.getPlan();
SqlKind sqlKind = PlannerContext.getPlannerContext(plan).getSqlKind();
String logicalTableName;
List<String> tableNameList;
if (plan instanceof LogicalInsert) {
tableNameList = ((LogicalInsert) plan).getTargetTableNames();
} else if (plan instanceof LogicalModifyView) {
tableNameList = ((LogicalModifyView) plan).getTableNames();
} else if (plan instanceof DirectTableOperation) {
tableNameList = ((DirectTableOperation) plan).getTableNames();
} else if (plan instanceof BroadcastTableModify) {
tableNameList = ((BroadcastTableModify) plan).getDirectTableOperation().getTableNames();
} else if (plan instanceof SingleTableOperation) {
tableNameList = ((SingleTableOperation) plan).getTableNames();
} else {
return;
}
if (tableNameList != null && tableNameList.size() == 1) {
logicalTableName = tableNameList.get(0);
} else {
return;
}
long affectRow = 0;
Cursor subCursor = resultCursor.getCursor();
if (subCursor instanceof AffectRowCursor) {
AffectRowCursor affectRowCursor = (AffectRowCursor) subCursor;
int[] affectRowArr = affectRowCursor.getAffectRows();
for (int j = 0; j < affectRowArr.length; j++) {
affectRow += affectRowArr[j];
}
} else {
return;
}
if (sqlKind == SqlKind.INSERT) {
OptimizerContext.getContext(executionContext.getSchemaName()).getStatisticManager()
.addUpdateRowCount(logicalTableName, affectRow);
}
if (sqlKind == SqlKind.DELETE) {
OptimizerContext.getContext(executionContext.getSchemaName()).getStatisticManager()
.addUpdateRowCount(logicalTableName, -affectRow);
}
}
/**
* update transaction and concurrent policy for autocommit broadcast/gsi
* table write operation
*
* @return is transaction policy updated
*/
private boolean updateTransactionAndConcurrentPolicy(ExecutionPlan plan, ExecutionContext ec) {
final BitSet properties = plan.getPlanProperties();
final boolean currentModifyBroadcast = properties.get(ExecutionPlanProperties.MODIFY_BROADCAST_TABLE);
boolean modifyBroadcastTable = currentModifyBroadcast;
boolean modifyGsiTable = properties.get(ExecutionPlanProperties.MODIFY_GSI_TABLE);
boolean modifyShardingColumn = properties.get(ExecutionPlanProperties.MODIFY_SHARDING_COLUMN);
boolean modifyScaleOutGroup = properties.get(ExecutionPlanProperties.MODIFY_SCALE_OUT_GROUP);
boolean modifyCrossDb = properties.get(ExecutionPlanProperties.MODIFY_CROSS_DB);
boolean dmlWithTransaction = ec.getParamManager().getBoolean(ConnectionParams.COMPLEX_DML_WITH_TRX);
boolean modifyReplicateTable = plan.getPlanProperties().get(ExecutionPlanProperties.REPLICATE_TABLE);
if (currentModifyBroadcast && !modifyGsiTable) {
ec.getExtraCmds().put(ConnectionProperties.FIRST_THEN_CONCURRENT_POLICY, true);
}
boolean modifyTable = properties.get(ExecutionPlanProperties.MODIFY_TABLE);
boolean selectWithLock = properties.get(ExecutionPlanProperties.SELECT_WITH_LOCK);
boolean isSelect = plan.getAst().getKind() == SqlKind.SELECT;
final boolean currentReadOnly = ec.isReadOnly();
boolean readOnlyUpdated = false;
if (!currentReadOnly && isAutoCommit && trxPolicy == ITransactionPolicy.TSO && !(modifyTable || selectWithLock)
&& isSelect) {
readOnlyUpdated = true;
ec.setReadOnly(true);
}
ec.setModifyBroadcastTable(modifyBroadcastTable);
ec.setModifyGsiTable(modifyGsiTable);
ec.setModifyShardingColumn(modifyShardingColumn);
ec.setModifyScaleOutGroup(modifyScaleOutGroup);
ec.setModifyCrossDb(modifyCrossDb);
executionContext.setModifyReplicateTable(modifyReplicateTable);
final boolean enableMultiWrite = modifyBroadcastTable || modifyGsiTable || modifyScaleOutGroup
|| modifyShardingColumn || modifyReplicateTable;
if (!enableMultiWrite && !(modifyCrossDb && dmlWithTransaction) && !readOnlyUpdated) {
return false;
}
// If it's already in a transaction
if (!isAutoCommit || !dataSource.getConfigHolder().getExecutorContext().getStorageInfoManager().supportXA()) {
if (modifyGsiTable) {
// On mysql 5.6, if STORAGE_CHECK_ON_GSI=Off, skip
if (!dataSource.getConfigHolder().getExecutorContext().getStorageInfoManager().supportXA()
&& !ec.getParamManager().getBoolean(ConnectionParams.STORAGE_CHECK_ON_GSI)) {
return false;
}
// Only support XA/TSO trx
if (!(ec.getTransaction().isStrongConsistent())) {
throw new TddlRuntimeException(ErrorCode.ERR_GLOBAL_SECONDARY_INDEX_ONLY_SUPPORT_XA);
}
}
return false;
}
String policyName = ec.getParamManager().getString(ConnectionParams.TRANSACTION_POLICY);
ITransactionPolicy policy = ITransactionPolicy.of(policyName);
if (null != policy) {
final boolean isDistributedTransaction =
policy.getTransactionType(false, false).isA(TransactionClass.DISTRIBUTED_TRANSACTION);
if (!isDistributedTransaction) {
ec.getExtraCmds().put(ConnectionProperties.TRANSACTION_POLICY, null);
}
}
// create new transaction object
ITransaction trx = forceInitTransaction(ec);
ec.setTransaction(trx);
return true;
}
/**
* acquire mdl for each table modified
*/
private void acquireTransactionalMdl(final String sql, final ExecutionPlan plan, final ExecutionContext ec) {
final MdlContext mdlContext = getMdlContext();
if (null == mdlContext) {
// For sql statement mdl can never be null
// But for internal use like DbLock.init(), mdlContext always null
return;
}
if (!ec.getParamManager().getBoolean(ConnectionParams.ENABLE_MDL)) {
return;
}
// disable mdl for no_transaction
// no_transaction策略下，即使autocommit=false，每条语句也会生成一个新的AutoCommitTransaction对象
// 每个AutoCommitTransaction拥有不同的id（MDL锁根据id来管理）
// 这样最终TConnection.commit内进行MDL的释放的时候，只能释放最后一个AutoCommitTransaction对应的MDL，从而导致MDL泄露
// 因此直接关掉NO_TRANSACTION的MDL，目前该事务策略主要被datax使用
if (this.trxPolicy == ITransactionPolicy.NO_TRANSACTION) {
return;
}
final Long trxId = ec.getTransaction().getId();
Set<Pair<String, String>> tables = plan.getTableSet();
if (tables != null) {
tables.stream().sorted(Comparator.comparing(Pair::getValue)).forEach(table -> {
String schemaName = table.getKey();
if (schemaName == null) {
schemaName = executionContext.getSchemaName();
}
if (InformationSchema.NAME.equalsIgnoreCase(schemaName) ||
PerformanceSchema.NAME.equalsIgnoreCase(schemaName) ||
MysqlSchema.NAME.equalsIgnoreCase(schemaName)) {
return; // These schemas never change.
}
TableMeta meta = ec.getSchemaManager(schemaName).getTableWithNull(table.getValue());
if (meta != null) {
mdlContext.acquireLock(MdlRequest.getTransactionalDmlMdlRequest(trxId,
schemaName, meta.getDigest(),
executionContext.getTraceId(), sql, frontendConnectionInfo));
}
});
}
}
private void refreshTableMeta() {
if (executionContext != null) {
executionContext.refreshTableMeta();
}
}
/**
* release transactional mdl by transaction id
*/
private void releaseTransactionalMdl(ExecutionContext ec) {
final MdlContext mdlContext = getMdlContext();
if (null == mdlContext) {
// For sql statement mdl can never be null
// But for internal use like DbLock.init(), mdlContext always null
return;
}
if (ec.getTransaction() == null) {
return;
}
if (!ec.getParamManager().getBoolean(ConnectionParams.ENABLE_MDL)) {
return;
}
// disable mdl for no_transaction
if (this.trxPolicy == ITransactionPolicy.NO_TRANSACTION) {
return;
}
mdlContext.releaseTransactionalLocks(ec.getTransaction().getId());
}
/**
* Load db privilege from connection properties if exists.
*/
private void loadDbPriv(ExecutionContext executionContext) {
PrivilegeContext pc = executionContext.getPrivilegeContext();
if (pc != null) {
DbPriv dbPriv = pc.getDatabasePrivilege();
long dbPrivFromProperties = executionContext.getParamManager().getLong(ConnectionParams.DB_PRIV);
if (dbPrivFromProperties > 0) {
// 只要配了就覆盖其他渠道
if (dbPriv == null) {
dbPriv = new DbPriv(dataSource.getSchemaName());
pc.setDatabasePrivilege(dbPriv);
}
dbPriv.loadPriv(dbPrivFromProperties);
}
}
}
public PreparedStatement prepareStatement(ByteString sql) throws SQLException {
checkClosed();
ExecutionContext context = prepareExecutionContext();
TPreparedStatement stmt = new TPreparedStatement(dataSource, this, sql, context);
synchronized (openedStatements) {
openedStatements.add(stmt);
}
return stmt;
}