fix #1370

修复事务内insert ER子表 joinKey指定父表字段为非分片字段时抛can't find
(root) parent sharding node for sql的BUG

src/main/java/io/mycat/backend/mysql/nio/handler/FetchStoreNodeOfChildTableHandler.java

@@ -23,6 +23,7 @@
  */
 package io.mycat.backend.mysql.nio.handler;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
@@ -32,13 +33,13 @@
 
 import io.mycat.MycatServer;
 import io.mycat.backend.BackendConnection;
-import io.mycat.backend.ConnectionMeta;
 import io.mycat.backend.datasource.PhysicalDBNode;
 import io.mycat.cache.CachePool;
 import io.mycat.config.MycatConfig;
 import io.mycat.net.mysql.ErrorPacket;
 import io.mycat.net.mysql.RowDataPacket;
 import io.mycat.route.RouteResultsetNode;
+import io.mycat.server.ServerConnection;
 import io.mycat.server.parser.ServerParse;
 
 /**
@@ -56,6 +57,67 @@ public class FetchStoreNodeOfChildTableHandler implements ResponseHandler {
 	private volatile String dataNode;
 	private AtomicInteger finished = new AtomicInteger(0);
 	protected final ReentrantLock lock = new ReentrantLock();
+
+	public String execute(String schema, String sql, List<String> dataNodes, ServerConnection sc) {
+
+		String key = schema + ":" + sql;
+		CachePool cache = MycatServer.getInstance().getCacheService()
+				.getCachePool("ER_SQL2PARENTID");
+		String result = (String) cache.get(key);
+		if (result != null) {
+			return result;
+		}
+		this.sql = sql;
+		int totalCount = dataNodes.size();
+		long startTime = System.currentTimeMillis();
+		long endTime = startTime + 5 * 60 * 1000L;
+		MycatConfig conf = MycatServer.getInstance().getConfig();
+
+		LOGGER.debug("find child node with sql:" + sql);
+		for (String dn : dataNodes) {
+			if (dataNode != null) {
+				return dataNode;
+			}
+			PhysicalDBNode mysqlDN = conf.getDataNodes().get(dn);
+			try {
+				if (LOGGER.isDebugEnabled()) {
+					LOGGER.debug("execute in datanode " + dn);
+				}
+				RouteResultsetNode node = new RouteResultsetNode(dn, ServerParse.SELECT, sql);
+				node.setRunOnSlave(false);	// 获取 子表节点，最好走master为好
+
+				/*
+				 * fix #1370 默认应该先从已经持有的连接中取连接, 否则可能因为事务隔离性看不到当前事务内更新的数据
+				 * Tips: 通过mysqlDN.getConnection获取到的连接不是当前连接
+				 *
+				 */
+				BackendConnection conn = sc.getSession2().getTarget(node);
+				if(sc.getSession2().tryExistsCon(conn, node)) {
+					_execute(conn, node, sc);
+				} else {
+					mysqlDN.getConnection(mysqlDN.getDatabase(), sc.isAutocommit(), node, this, node);
+				}
+			} catch (Exception e) {
+				LOGGER.warn("get connection err " + e);
+			}
+		}
+
+		while (dataNode == null && System.currentTimeMillis() < endTime) {
+			try {
+				Thread.sleep(50);
+			} catch (InterruptedException e) {
+				break;
+			}
+			if (dataNode != null || finished.get() >= totalCount) {
+				break;
+			}
+		}
+		if (dataNode != null) {
+			cache.putIfAbsent(key, dataNode);
+		}
+		return dataNode;
+
+	}
 
 	public String execute(String schema, String sql, ArrayList<String> dataNodes) {
 		String key = schema + ":" + sql;
@@ -84,7 +146,7 @@ public String execute(String schema, String sql, ArrayList<String> dataNodes) {
 				RouteResultsetNode node = new RouteResultsetNode(dn, ServerParse.SELECT, sql);
 				node.setRunOnSlave(false);	// 获取 子表节点，最好走master为好
 
-				mysqlDN.getConnection(mysqlDN.getDatabase(), true, node, this, dn);
+				mysqlDN.getConnection(mysqlDN.getDatabase(), true, node, this, node);
 
 //				mysqlDN.getConnection(mysqlDN.getDatabase(), true,
 //						new RouteResultsetNode(dn, ServerParse.SELECT, sql),
@@ -115,6 +177,15 @@ public String execute(String schema, String sql, ArrayList<String> dataNodes) {
 		return dataNode;
 
 	}
+
+	private void _execute(BackendConnection conn, RouteResultsetNode node, ServerConnection sc) {
+		conn.setResponseHandler(this);
+		try {
+			conn.execute(node, sc, sc.isAutocommit());
+		} catch (IOException e) {
+			connectionError(e, conn);
+		}
+	}
 
 	@Override
 	public void connectionAcquired(BackendConnection conn) {
@@ -162,7 +233,7 @@ public void rowResponse(byte[] row, BackendConnection conn) {
 		}
 		if (result == null) {
 			result = getColumn(row);
-			dataNode = (String) conn.getAttachment();
+			dataNode = ((RouteResultsetNode) conn.getAttachment()).getName();
 		} else {
 			LOGGER.warn("find multi data nodes for child table store, sql is:  "
 					+ sql);

src/main/java/io/mycat/route/util/RouterUtil.java

@@ -1592,7 +1592,8 @@ public static boolean processERChildTable(final SchemaConfig schema, final Strin
 				@Override
 				public String call() throws Exception {
 					FetchStoreNodeOfChildTableHandler fetchHandler = new FetchStoreNodeOfChildTableHandler();
-					return fetchHandler.execute(schema.getName(), findRootTBSql, tc.getRootParent().getDataNodes());
+//					return fetchHandler.execute(schema.getName(), findRootTBSql, tc.getRootParent().getDataNodes());
+					return fetchHandler.execute(schema.getName(), findRootTBSql, tc.getRootParent().getDataNodes(), sc);
 				}
 			});
 
@@ -1605,6 +1606,9 @@ public void onSuccess(String result) {
 						StringBuilder s = new StringBuilder();
 						LOGGER.warn(s.append(sc.getSession2()).append(origSQL).toString() +
 								" err:" + "can't find (root) parent sharding node for sql:" + origSQL);
+						if(!sc.isAutocommit()) { // 处于事务下失败, 必须回滚
+							sc.setTxInterrupt("can't find (root) parent sharding node for sql:" + origSQL);
+						}
 						sc.writeErrMessage(ErrorCode.ER_PARSE_ERROR, "can't find (root) parent sharding node for sql:" + origSQL);
 						return;
 					}