/*
 * 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.phoenix.end2end.index;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import com.google.common.collect.Maps;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.phoenix.end2end.BaseUniqueNamesOwnClusterIT;
import org.apache.phoenix.end2end.IndexToolIT;
import org.apache.phoenix.hbase.index.IndexRegionObserver;
import org.apache.phoenix.util.PhoenixRuntime;
import org.apache.phoenix.util.QueryUtil;
import org.apache.phoenix.util.ReadOnlyProps;
import org.junit.After;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;
import com.google.common.collect.Lists;

@RunWith(Parameterized.class)
public class GlobalIndexCheckerIT extends BaseUniqueNamesOwnClusterIT {
    private static final Log LOG = LogFactory.getLog(GlobalIndexCheckerIT.class);
    private final boolean async;
    private final String tableDDLOptions;

    public GlobalIndexCheckerIT(boolean async, boolean encoded) {
        this.async = async;
        StringBuilder optionBuilder = new StringBuilder();
        if (!encoded) {
            optionBuilder.append(" COLUMN_ENCODED_BYTES=0 ");
        }
        this.tableDDLOptions = optionBuilder.toString();
    }

    @BeforeClass
    public static synchronized void doSetup() throws Exception {
        Map<String, String> props = Maps.newHashMapWithExpectedSize(1);
        setUpTestDriver(new ReadOnlyProps(props.entrySet().iterator()));
    }

    @Parameters(
            name = "async={0},encoded={1}")
    public static synchronized Collection<Object[]> data() {
        List<Object[]> list = Lists.newArrayListWithExpectedSize(4);
        boolean[] Booleans = new boolean[]{true, false};
            for (boolean async : Booleans) {
                for (boolean encoded : Booleans) {
                    list.add(new Object[]{async, encoded});
                }
            }
        return list;
    }

    @After
    public void unsetFailForTesting() {
        IndexRegionObserver.setFailPreIndexUpdatesForTesting(false);
        IndexRegionObserver.setFailDataTableUpdatesForTesting(false);
        IndexRegionObserver.setFailPostIndexUpdatesForTesting(false);
    }

    public static void assertExplainPlan(Connection conn, String selectSql,
                                         String dataTableFullName, String indexTableFullName) throws SQLException {
        ResultSet rs = conn.createStatement().executeQuery("EXPLAIN " + selectSql);
        String actualExplainPlan = QueryUtil.getExplainPlan(rs);
        IndexToolIT.assertExplainPlan(false, actualExplainPlan, dataTableFullName, indexTableFullName);
    }

    private void populateTable(String tableName) throws Exception {
        Connection conn = DriverManager.getConnection(getUrl());
        conn.createStatement().execute("create table " + tableName +
                " (id varchar(10) not null primary key, val1 varchar(10), val2 varchar(10), val3 varchar(10))" + tableDDLOptions);
        conn.createStatement().execute("upsert into " + tableName + " values ('a', 'ab', 'abc', 'abcd')");
        conn.commit();
        conn.createStatement().execute("upsert into " + tableName + " values ('b', 'bc', 'bcd', 'bcde')");
        conn.commit();
        conn.close();
    }

    @Test
    public void testFailPostIndexDeleteUpdate() throws Exception {
        String dataTableName = generateUniqueName();
        populateTable(dataTableName); // with two rows ('a', 'ab', 'abc', 'abcd') and ('b', 'bc', 'bcd', 'bcde')
        try (Connection conn = DriverManager.getConnection(getUrl())) {
            String indexTableName = generateUniqueName();
            conn.createStatement().execute("CREATE INDEX " + indexTableName + " on " +
                    dataTableName + " (val1) include (val2, val3)" + (async ? "ASYNC" : ""));
            if (async) {
                // run the index MR job.
                IndexToolIT.runIndexTool(true, false, null, dataTableName, indexTableName);
            }
            String selectSql = "SELECT id from " + dataTableName + " WHERE val1  = 'ab'";
            ResultSet rs = conn.createStatement().executeQuery(selectSql);
            assertTrue(rs.next());
            assertEquals("a", rs.getString(1));
            assertFalse(rs.next());

            // Configure IndexRegionObserver to fail the last write phase (i.e., the post index update phase) where the verify flag is set
            // to true and/or index rows are deleted and check that this does not impact the correctness
            IndexRegionObserver.setFailPostIndexUpdatesForTesting(true);
            String dml = "DELETE from " + dataTableName + " WHERE id  = 'a'";
            assertEquals(1, conn.createStatement().executeUpdate(dml));
            conn.commit();

            // The index rows are actually not deleted yet because IndexRegionObserver failed delete operation. However, they are
            // made unverified in the pre index update phase (i.e., the first write phase)
            dml = "DELETE from " + dataTableName + " WHERE val1  = 'ab'";
            // This DML will scan the Index table and detect unverified index rows. This will trigger read repair which
            // result in deleting these rows since the corresponding data table rows are deleted already. So, the number of
            // rows to be deleted by the "DELETE" DML will be zero since the rows deleted by read repair will not be visible
            // to the DML
            assertEquals(0, conn.createStatement().executeUpdate(dml));

            // Count the number of index rows
            String query = "SELECT COUNT(*) from " + indexTableName;
            // There should be one row in the index table
            rs = conn.createStatement().executeQuery(query);
            assertTrue(rs.next());
            assertEquals(1, rs.getInt(1));
            // Add rows and check everything is still okay
            verifyTableHealth(conn, dataTableName, indexTableName);
        }
    }

    @Test
    public void testPartialRowUpdate() throws Exception {
        String dataTableName = generateUniqueName();
        populateTable(dataTableName); // with two rows ('a', 'ab', 'abc', 'abcd') and ('b', 'bc', 'bcd', 'bcde')
        Connection conn = DriverManager.getConnection(getUrl());
        String indexTableName = generateUniqueName();
        conn.createStatement().execute("CREATE INDEX " + indexTableName + " on " +
                dataTableName + " (val1) include (val2, val3)" + (async ? "ASYNC" : ""));
        if (async) {
            // run the index MR job.
            IndexToolIT.runIndexTool(true, false, null, dataTableName, indexTableName);
        }
        conn.createStatement().execute("upsert into " + dataTableName + " (id, val2) values ('a', 'abcc')");
        conn.commit();
        conn.createStatement().execute("upsert into " + dataTableName + " (id, val2) values ('c', 'cde')");
        conn.commit();
        String selectSql =  "SELECT * from " + dataTableName + " WHERE val1  = 'ab'";
        // Verify that we will read from the index table
        assertExplainPlan(conn, selectSql, dataTableName, indexTableName);
        ResultSet rs = conn.createStatement().executeQuery(selectSql);
        assertTrue(rs.next());
        assertEquals("a", rs.getString(1));
        assertEquals("ab", rs.getString(2));
        assertEquals("abcc", rs.getString(3));
        assertEquals("abcd", rs.getString(4));
        assertFalse(rs.next());

        conn.createStatement().execute("upsert into " + dataTableName + " (id, val1, val3) values ('a', 'ab', 'abcdd')");
        conn.commit();
        // Verify that we will read from the index table
        assertExplainPlan(conn, selectSql, dataTableName, indexTableName);
        rs = conn.createStatement().executeQuery(selectSql);
        assertTrue(rs.next());
        assertEquals("a", rs.getString(1));
        assertEquals("ab", rs.getString(2));
        assertEquals("abcc", rs.getString(3));
        assertEquals("abcdd", rs.getString(4));
        assertFalse(rs.next());
        conn.close();
    }

    @Test
    public void testFailPreIndexRowUpdate() throws Exception {
        String dataTableName = generateUniqueName();
        populateTable(dataTableName); // with two rows ('a', 'ab', 'abc', 'abcd') and ('b', 'bc', 'bcd', 'bcde')
        try (Connection conn = DriverManager.getConnection(getUrl())) {
            String indexTableName = generateUniqueName();
            conn.createStatement().execute("CREATE INDEX " + indexTableName + " on " +
                    dataTableName + " (val1) include (val2, val3)" + (async ? "ASYNC" : ""));
            if (async) {
                // run the index MR job.
                IndexToolIT.runIndexTool(true, false, null, dataTableName, indexTableName);
            }
            // Configure IndexRegionObserver to fail the first write phase (i.e., the pre index update phase). This should not
            // lead to any change on index or data table rows
            IndexRegionObserver.setFailPreIndexUpdatesForTesting(true);
            conn.createStatement().execute("upsert into " + dataTableName + " (id, val2) values ('a', 'abcc')");
            commitWithException(conn);
            conn.createStatement().execute("upsert into " + dataTableName + " (id, val1, val2) values ('c', 'cd','cde')");
            commitWithException(conn);
            IndexRegionObserver.setFailPreIndexUpdatesForTesting(false);
            String selectSql = "SELECT val2, val3 from " + dataTableName + " WHERE val1  = 'ab'";
            // Verify that we will read from the index table
            assertExplainPlan(conn, selectSql, dataTableName, indexTableName);
            ResultSet rs = conn.createStatement().executeQuery(selectSql);
            assertTrue(rs.next());
            assertEquals("abc", rs.getString(1));
            assertEquals("abcd", rs.getString(2));
            assertFalse(rs.next());
            // Add rows and check everything is still okay
            verifyTableHealth(conn, dataTableName, indexTableName);
        }
    }

    @Test
    public void testFailPostIndexRowUpdate() throws Exception {
        String dataTableName = generateUniqueName();
        populateTable(dataTableName); // with two rows ('a', 'ab', 'abc', 'abcd') and ('b', 'bc', 'bcd', 'bcde')
        try (Connection conn = DriverManager.getConnection(getUrl())) {
            String indexTableName = generateUniqueName();
            conn.createStatement().execute("CREATE INDEX " + indexTableName + " on " +
                    dataTableName + " (val1) include (val2, val3)" + (async ? "ASYNC" : ""));
            if (async) {
                // run the index MR job.
                IndexToolIT.runIndexTool(true, false, null, dataTableName, indexTableName);
            }
            // Configure IndexRegionObserver to fail the last write phase (i.e., the post index update phase) where the verify flag is set
            // to true and/or index rows are deleted and check that this does not impact the correctness
            IndexRegionObserver.setFailPostIndexUpdatesForTesting(true);
            conn.createStatement().execute("upsert into " + dataTableName + " (id, val2) values ('a', 'abcc')");
            conn.commit();
            conn.createStatement().execute("upsert into " + dataTableName + " (id, val1, val2) values ('c', 'cd','cde')");
            conn.commit();
            IndexRegionObserver.setFailPostIndexUpdatesForTesting(false);
            String selectSql = "SELECT val2, val3 from " + dataTableName + " WHERE val1  = 'ab' and val2 = 'abcc'";
            // Verify that we will read from the index table
            assertExplainPlan(conn, selectSql, dataTableName, indexTableName);
            ResultSet rs = conn.createStatement().executeQuery(selectSql);
            assertTrue(rs.next());
            assertEquals("abcc", rs.getString(1));
            assertEquals("abcd", rs.getString(2));
            assertFalse(rs.next());
            // Add rows and check everything is still okay
            verifyTableHealth(conn, dataTableName, indexTableName);
        }
    }

    @Test
    public void testOnePhaseOverwiteFollowingTwoPhaseWrite() throws Exception {
        try (Connection conn = DriverManager.getConnection(getUrl())) {
            String dataTableName = generateUniqueName();
            populateTable(dataTableName); // with two rows ('a', 'ab', 'abc', 'abcd') and ('b', 'bc', 'bcd', 'bcde')
            String indexTableName = generateUniqueName();
            conn.createStatement().execute("CREATE INDEX " + indexTableName + "1 on " +
                    dataTableName + " (val1) include (val2, val3)" + (async ? "ASYNC" : ""));
            conn.createStatement().execute("CREATE INDEX " + indexTableName + "2 on " +
                    dataTableName + " (val2) include (val1, val3)" + (async ? "ASYNC" : ""));
            if (async) {
                // run the index MR job.
                IndexToolIT.runIndexTool(true, false, null, dataTableName, indexTableName + "1");
                IndexToolIT.runIndexTool(true, false, null, dataTableName, indexTableName + "2");
            }
            // Two Phase write. This write is recoverable
            IndexRegionObserver.setFailPostIndexUpdatesForTesting(true);
            conn.createStatement().execute("upsert into " + dataTableName + " values ('c', 'cd', 'cde', 'cdef')");
            conn.commit();
            // One Phase write. This write is not recoverable
            IndexRegionObserver.setFailDataTableUpdatesForTesting(true);
            conn.createStatement().execute("upsert into " + dataTableName + " values ('c', 'cd', 'cdee', 'cdfg')");
            commitWithException(conn);
            // Let three phase writes happen as in the normal case
            IndexRegionObserver.setFailDataTableUpdatesForTesting(false);
            IndexRegionObserver.setFailPostIndexUpdatesForTesting(false);
            String selectSql = "SELECT val2, val3 from " + dataTableName + " WHERE val1  = 'cd'";
            // Verify that we will read from the first index table
            assertExplainPlan(conn, selectSql, dataTableName, indexTableName + "1");
            // Verify the first write is visible but the second one is not
            ResultSet rs = conn.createStatement().executeQuery(selectSql);
            assertTrue(rs.next());
            assertEquals("cde", rs.getString(1));
            assertEquals("cdef", rs.getString(2));
            assertFalse(rs.next());
            // Add rows and check everything is still okay
            verifyTableHealth(conn, dataTableName, indexTableName);
        }
    }

    @Test
    public void testOnePhaseOverwrite() throws Exception {
        try (Connection conn = DriverManager.getConnection(getUrl())) {
            String dataTableName = generateUniqueName();
            populateTable(dataTableName); // with two rows ('a', 'ab', 'abc', 'abcd') and ('b', 'bc', 'bcd', 'bcde')
            String indexTableName = generateUniqueName();
            conn.createStatement().execute("CREATE INDEX " + indexTableName + "1 on " +
                    dataTableName + " (val1) include (val2, val3)" + (async ? "ASYNC" : ""));
            conn.createStatement().execute("CREATE INDEX " + indexTableName + "2 on " +
                    dataTableName + " (val2) include (val1, val3)" + (async ? "ASYNC" : ""));
            if (async) {
                // run the index MR job.
                IndexToolIT.runIndexTool(true, false, null, dataTableName, indexTableName + "1");
                IndexToolIT.runIndexTool(true, false, null, dataTableName, indexTableName + "2");
            }
            // Configure IndexRegionObserver to skip the last two write phase (i.e., the data table update and post index
            // update phase) and check that this does not impact the correctness (one overwrite)
            IndexRegionObserver.setFailDataTableUpdatesForTesting(true);
            IndexRegionObserver.setFailPostIndexUpdatesForTesting(true);
            conn.createStatement().execute("upsert into " + dataTableName + " (id, val2) values ('a', 'abcc')");
            commitWithException(conn);
            IndexRegionObserver.setFailDataTableUpdatesForTesting(false);
            IndexRegionObserver.setFailPostIndexUpdatesForTesting(false);
            String selectSql =  "SELECT val2, val3 from " + dataTableName + " WHERE val1  = 'ab'";
            // Verify that we will read from the first index table
            assertExplainPlan(conn, selectSql, dataTableName, indexTableName + "1");
            // Verify that one phase write has no effect
            ResultSet rs = conn.createStatement().executeQuery(selectSql);
            assertTrue(rs.next());
            assertEquals("abc", rs.getString(1));
            assertEquals("abcd", rs.getString(2));
            assertFalse(rs.next());
            selectSql =  "SELECT val2, val3 from " + dataTableName + " WHERE val2  = 'abcc'";
            // Verify that we will read from the second index table
            assertExplainPlan(conn, selectSql, dataTableName, indexTableName + "2");
            rs = conn.createStatement().executeQuery(selectSql);
            // Verify that one phase writes have no effect
            assertFalse(rs.next());
            // Configure IndexRegionObserver to skip the last two write phase (i.e., the data table update and post index
            // update phase) and check that this does not impact the correctness  (two overwrites)
            IndexRegionObserver.setFailDataTableUpdatesForTesting(true);
            IndexRegionObserver.setFailPostIndexUpdatesForTesting(true);
            conn.createStatement().execute("upsert into " + dataTableName + " (id, val2) values ('a', 'abccc')");
            commitWithException(conn);
            conn.createStatement().execute("upsert into " + dataTableName + " (id, val2) values ('a', 'abcccc')");
            commitWithException(conn);
            IndexRegionObserver.setFailDataTableUpdatesForTesting(false);
            IndexRegionObserver.setFailPostIndexUpdatesForTesting(false);
            selectSql =  "SELECT val2, val3 from " + dataTableName + " WHERE val1  = 'ab'";
            // Verify that we will read from the first index table
            assertExplainPlan(conn, selectSql, dataTableName, indexTableName + "1");
            // Verify that one phase writes have no effect
            rs = conn.createStatement().executeQuery(selectSql);
            assertTrue(rs.next());
            assertEquals("abc", rs.getString(1));
            assertEquals("abcd", rs.getString(2));
            assertFalse(rs.next());
            selectSql =  "SELECT val2, val3 from " + dataTableName + " WHERE val2  = 'abccc'";
            // Verify that we will read from the second index table
            assertExplainPlan(conn, selectSql, dataTableName, indexTableName + "2");
            rs = conn.createStatement().executeQuery(selectSql);
            // Verify that one phase writes have no effect
            assertFalse(rs.next());
            selectSql =  "SELECT val2, val3 from " + dataTableName + " WHERE val2  = 'abcccc'";
            // Verify that we will read from the second index table
            assertExplainPlan(conn, selectSql, dataTableName, indexTableName + "2");
            rs = conn.createStatement().executeQuery(selectSql);
            // Verify that one phase writes have no effect
            assertFalse(rs.next());
            // Add rows and check everything is still okay
            verifyTableHealth(conn, dataTableName, indexTableName);
        }
    }

    @Test
    public void testFailDataTableAndPostIndexRowUpdate() throws Exception {
        String dataTableName = generateUniqueName();
        populateTable(dataTableName); // with two rows ('a', 'ab', 'abc', 'abcd') and ('b', 'bc', 'bcd', 'bcde')
        try (Connection conn = DriverManager.getConnection(getUrl())) {
            String indexName = generateUniqueName();
            conn.createStatement().execute("CREATE INDEX " + indexName + "1 on " +
                    dataTableName + " (val1) include (val2, val3)" + (async ? "ASYNC" : ""));
            conn.createStatement().execute("CREATE INDEX " + indexName + "2 on " +
                    dataTableName + " (val2) include (val1, val3)" + (async ? "ASYNC" : ""));
            if (async) {
                // run the index MR job.
                IndexToolIT.runIndexTool(true, false, null, dataTableName, indexName + "1");
                IndexToolIT.runIndexTool(true, false, null, dataTableName, indexName + "2");
            }
            // Configure IndexRegionObserver to fail the last two write phase (i.e., the data table update and post index update phase)
            // and check that this does not impact the correctness
            IndexRegionObserver.setFailDataTableUpdatesForTesting(true);
            IndexRegionObserver.setFailPostIndexUpdatesForTesting(true);
            conn.createStatement().execute("upsert into " + dataTableName + " (id, val2) values ('a', 'abcc')");
            commitWithException(conn);
            IndexRegionObserver.setFailDataTableUpdatesForTesting(false);
            IndexRegionObserver.setFailPostIndexUpdatesForTesting(false);
            conn.createStatement().execute("upsert into " + dataTableName + " (id, val3) values ('a', 'abcdd')");
            conn.commit();
            String selectSql = "SELECT val2, val3 from " + dataTableName + " WHERE val1  = 'ab'";
            // Verify that we will read from the first index table
            assertExplainPlan(conn, selectSql, dataTableName, indexName + "1");
            ResultSet rs = conn.createStatement().executeQuery(selectSql);
            assertTrue(rs.next());
            assertEquals("abc", rs.getString(1));
            assertEquals("abcdd", rs.getString(2));
            assertFalse(rs.next());
            selectSql = "SELECT val2, val3 from " + dataTableName + " WHERE val2  = 'abc'";
            // Verify that we will read from the second index table
            assertExplainPlan(conn, selectSql, dataTableName, indexName + "2");
            rs = conn.createStatement().executeQuery(selectSql);
            assertTrue(rs.next());
            assertEquals("abc", rs.getString(1));
            assertEquals("abcdd", rs.getString(2));
            assertFalse(rs.next());
            // Add rows and check everything is still okay
            verifyTableHealth(conn, dataTableName, indexName);
        }
    }

    @Test
    public void testViewIndexRowUpdate() throws Exception {
        if (async) {
            // No need to run the same test twice one for async = true and the other for async = false
            return;
        }
        try (Connection conn = DriverManager.getConnection(getUrl())) {
            // Create a base table
            String dataTableName = generateUniqueName();
            conn.createStatement().execute("create table " + dataTableName +
                    " (oid varchar(10) not null, kp char(3) not null, val1 varchar(10)" +
                    "CONSTRAINT pk PRIMARY KEY (oid, kp)) COLUMN_ENCODED_BYTES=0, MULTI_TENANT=true");
            // Create a view on the base table
            String viewName = generateUniqueName();
            conn.createStatement().execute("CREATE VIEW " + viewName + " (id char(10) not null, " +
                    "val2 varchar, val3 varchar, CONSTRAINT pk PRIMARY KEY (id)) AS SELECT * FROM " + dataTableName +
                    " WHERE kp = '0EC'");
            // Create an index on the view
            String indexName = generateUniqueName();
            conn.createStatement().execute("CREATE INDEX " + indexName + " on " +
                    viewName + " (val2) include (val3)");
            Properties props = new Properties();
            props.setProperty(PhoenixRuntime.TENANT_ID_ATTRIB, "o1");
            try (Connection tenantConn = DriverManager.getConnection(getUrl(), props)) {
                // Configure IndexRegionObserver to fail the last write phase (i.e., the post index update phase)
                // This will leave index rows unverified
                // Create a view of the view
                String childViewName = generateUniqueName();
                tenantConn.createStatement().execute("CREATE VIEW " + childViewName + " (zid CHAR(15)) " +
                        "AS SELECT * FROM " + viewName);
                // Create another view of the child view
                String grandChildViewName = generateUniqueName();
                tenantConn.createStatement().execute("CREATE VIEW " + grandChildViewName + " (val4 CHAR(15)) " +
                        "AS SELECT * FROM " + childViewName);
                IndexRegionObserver.setFailPostIndexUpdatesForTesting(true);
                tenantConn.createStatement().execute("upsert into " + childViewName + " (zid, id, val1, val2, val3) VALUES('z1','1', 'a1','b1','c1')");
                tenantConn.commit();
                IndexRegionObserver.setFailPostIndexUpdatesForTesting(false);
                // Activate read repair
                String selectSql = "select val3 from  " + childViewName + " WHERE val2  = 'b1'";
                ResultSet rs = tenantConn.createStatement().executeQuery(selectSql);
                assertTrue(rs.next());
                assertEquals("c1", rs.getString("val3"));
                // Configure IndexRegionObserver to fail the last write phase (i.e., the post index update phase)
                // This will leave index rows unverified
                IndexRegionObserver.setFailPostIndexUpdatesForTesting(true);
                tenantConn.createStatement().execute("upsert into " + grandChildViewName + " (zid, id, val2, val3, val4) VALUES('z1', '2', 'b2', 'c2', 'd1')");
                tenantConn.commit();
                IndexRegionObserver.setFailPostIndexUpdatesForTesting(false);
                // Activate read repair
                selectSql = "select id, val3 from  " + grandChildViewName + " WHERE val2  = 'b2'";
                rs = tenantConn.createStatement().executeQuery(selectSql);
                assertTrue(rs.next());
                assertEquals("2", rs.getString("id"));
                assertEquals("c2", rs.getString("val3"));
            }
        }
    }

    static private void commitWithException(Connection conn) {
        try {
            conn.commit();
            IndexRegionObserver.setFailPreIndexUpdatesForTesting(false);
            IndexRegionObserver.setFailDataTableUpdatesForTesting(false);
            IndexRegionObserver.setFailPostIndexUpdatesForTesting(false);
            fail();
        } catch (Exception e) {
            // this is expected
        }
    }

    static private void verifyTableHealth(Connection conn, String dataTableName, String indexTableName) throws Exception {
        // Add two rows and check everything is still okay
        conn.createStatement().execute("upsert into " + dataTableName + " values ('a', 'ab', 'abc', 'abcd')");
        conn.createStatement().execute("upsert into " + dataTableName + " values ('z', 'za', 'zab', 'zabc')");
        conn.commit();
        String selectSql = "SELECT * from " + dataTableName + " WHERE val1  = 'ab'";
        ///Verify that we will read from the index table
        assertExplainPlan(conn, selectSql, dataTableName, indexTableName);
        ResultSet rs = conn.createStatement().executeQuery(selectSql);
        assertTrue(rs.next());
        assertEquals("a", rs.getString(1));
        assertEquals("ab", rs.getString(2));
        assertEquals("abc", rs.getString(3));
        assertEquals("abcd", rs.getString(4));
        assertFalse(rs.next());
        selectSql = "SELECT * from " + dataTableName + " WHERE val1  = 'za'";
        ///Verify that we will read from the index table
        assertExplainPlan(conn, selectSql, dataTableName, indexTableName);
        rs = conn.createStatement().executeQuery(selectSql);
        conn.commit();
        assertTrue(rs.next());
        assertEquals("z", rs.getString(1));
        assertEquals("za", rs.getString(2));
        assertEquals("zab", rs.getString(3));
        assertEquals("zabc", rs.getString(4));
        assertFalse(rs.next());
    }
}