/// <summary>
/// Copies change tables from the relay to the slave server
/// </summary>
/// <param name="tables">Array of table config objects</param>
/// <param name="sourceCTDB">Source CT database</param>
/// <param name="destCTDB">Dest CT database</param>
/// <param name="CTID">CT batch ID this is for</param>
/// <param name="existingCTTables">List of existing CT tables</param>
/// <param name="isConsolidated">Whether source CT table is consolidated</param>
private void CopyChangeTables(IEnumerable <TableConf> tables, string sourceCTDB, string destCTDB, Int64 CTID, List <ChangeTable> existingCTTables, bool isConsolidated = false)
{
if (Config.Slave == Config.RelayServer && sourceCTDB == destCTDB)
{
logger.Log("Skipping download because slave is equal to relay.", LogLevel.Debug);
return;
}
var actions = new List <Action>();
foreach (TableConf t in tables)
{
if (Config.SlaveType == SqlFlavor.Vertica)
{
// NOTE: bug fix for ticket # 1699344
// Currently we are testing this fix for Vertica only
ChangeTable changeTable = existingCTTables.Where(ctbl => String.Compare(ctbl.name, t.Name, StringComparison.OrdinalIgnoreCase) == 0).OrderBy(ctbl => ctbl.CTID).LastOrDefault();
if (changeTable == null)
{
continue;
}
}
IDataCopy dataCopy = DataCopyFactory.GetInstance(Config.RelayType, Config.SlaveType, sourceDataUtils, destDataUtils, logger);
var ct = new ChangeTable(t.Name, CTID, t.SchemaName, Config.Slave);
string sourceCTTable = isConsolidated ? ct.consolidatedName : ct.ctName;
string destCTTable = ct.ctName;
TableConf tLocal = t;
Action act = () => {
try {
//hard coding timeout at 1 hour for bulk copy
logger.Log(new { message = "Copying table to slave", Table = tLocal.SchemaName + "." + sourceCTTable }, LogLevel.Trace);
var sw = Stopwatch.StartNew();
dataCopy.CopyTable(sourceCTDB, sourceCTTable, tLocal.SchemaName, destCTDB, Config.DataCopyTimeout, destCTTable, tLocal.Name);
logger.Log(new { message = "CopyTable: " + sw.Elapsed, Table = tLocal.SchemaName + "." + sourceCTTable }, LogLevel.Trace);
} catch (DoesNotExistException) {
//this is a totally normal and expected case since we only publish changetables when data actually changed
logger.Log("No changes to pull for table " + tLocal.SchemaName + "." + sourceCTTable + " because it does not exist ", LogLevel.Debug);
} catch (Exception e) {
HandleException(e, tLocal);
}
};
actions.Add(act);
}
logger.Log("Parallel invocation of " + actions.Count + " changetable downloads", LogLevel.Trace);
var options = new ParallelOptions();
options.MaxDegreeOfParallelism = Config.MaxThreads;
Parallel.Invoke(options, actions.ToArray());
return;
}
protected void PublishChangeTable(TableConf table, string sourceCTDB, string destCTDB, Int64 CTID)
{
IDataCopy dataCopy = DataCopyFactory.GetInstance((SqlFlavor)Config.MasterType, (SqlFlavor)Config.RelayType, sourceDataUtils, destDataUtils, logger);
logger.Log("Publishing changes for table " + table.SchemaName + "." + table.Name, LogLevel.Trace);
try {
dataCopy.CopyTable(sourceCTDB, table.ToCTName(CTID), table.SchemaName, destCTDB, Config.DataCopyTimeout, originalTableName: table.Name);
logger.Log("Publishing changes succeeded for " + table.SchemaName + "." + table.Name, LogLevel.Trace);
} catch (Exception e) {
if (table.StopOnError)
{
throw;
}
else
{
logger.Log("Copying change data for table " + table.SchemaName + "." + table.Name + " failed with error: " + e.Message, LogLevel.Error);
}
}
}
private IEnumerable <ChangeTable> ConsolidateBatches(IList <ChangeTable> tables)
{
var lu = new Dictionary <string, List <ChangeTable> >();
var actions = new List <Action>();
foreach (var changeTable in tables)
{
if (!lu.ContainsKey(changeTable.name))
{
lu[changeTable.name] = new List <ChangeTable>();
}
lu[changeTable.name].Add(changeTable);
}
var consolidatedTables = new List <ChangeTable>();
foreach (var table in Config.Tables)
{
if (!lu.ContainsKey(table.Name))
{
//ugly case sensitivity hack
var kvp = lu.FirstOrDefault(l => String.Compare(l.Key, table.Name, StringComparison.OrdinalIgnoreCase) == 0);
if (kvp.Key != null)
{
lu[table.Name] = lu[kvp.Key];
}
else
{
logger.Log("No changes captured for " + table.Name, LogLevel.Info);
var ct = new ChangeTable(table.Name, null, table.SchemaName, Config.Slave);
string sourceConsolidatedCTTable = ct.consolidatedName;
logger.Log("Dropping (if exists) consolidated CT table " + sourceConsolidatedCTTable, LogLevel.Info);
sourceDataUtils.DropTableIfExists(Config.RelayDB, sourceConsolidatedCTTable, table.SchemaName);
continue;
}
}
var lastChangeTable = lu[table.Name].OrderByDescending(c => c.CTID).First();
consolidatedTables.Add(lastChangeTable);
TableConf tLocal = table;
IDataCopy dataCopy = DataCopyFactory.GetInstance(Config.RelayType, Config.RelayType, sourceDataUtils, sourceDataUtils, logger);
Action act = () => {
try {
logger.Log("Copying " + lastChangeTable.ctName, LogLevel.Debug);
dataCopy.CopyTable(Config.RelayDB, lastChangeTable.ctName, tLocal.SchemaName, Config.RelayDB, Config.DataCopyTimeout, lastChangeTable.consolidatedName, tLocal.Name);
//skipping the first one because dataCopy.CopyTable already copied it).
foreach (var changeTable in lu[lastChangeTable.name].OrderByDescending(c => c.CTID).Skip(1))
{
logger.Log("Consolidating " + changeTable.ctName, LogLevel.Debug);
sourceDataUtils.Consolidate(changeTable.ctName, changeTable.consolidatedName, Config.RelayDB, tLocal.SchemaName);
}
sourceDataUtils.RemoveDuplicatePrimaryKeyChangeRows(tLocal, lastChangeTable.consolidatedName, Config.RelayDB);
} catch (Exception e) {
HandleException(e, tLocal);
}
};
actions.Add(act);
}
logger.Log("Parallel invocation of " + actions.Count + " changetable consolidations", LogLevel.Trace);
var options = new ParallelOptions();
options.MaxDegreeOfParallelism = Config.MaxThreads;
Parallel.Invoke(options, actions.ToArray());
return(consolidatedTables);
}
