/** Insert rows through staging phase */
private void insertRowsThroughStaging(
TaskAttemptContext taskAttemptContext,
InsertNode insertNode,
Path finalOutputPath,
Path stagingDir,
Path stagingResultDir)
throws IOException {
EvalExprExec evalExprExec =
new EvalExprExec(taskAttemptContext, (EvalExprNode) insertNode.getChild());
InsertRowsExec exec = new InsertRowsExec(taskAttemptContext, insertNode, evalExprExec);
try {
exec.init();
exec.next();
} finally {
exec.close();
}
FileSystem fs = TajoConf.getWarehouseDir(context.getConf()).getFileSystem(context.getConf());
if (insertNode.isOverwrite()) { // INSERT OVERWRITE INTO
// it moves the original table into the temporary location.
// Then it moves the new result table into the original table location.
// Upon failed, it recovers the original table if possible.
boolean movedToOldTable = false;
boolean committed = false;
Path oldTableDir = new Path(stagingDir, TajoConstants.INSERT_OVERWIRTE_OLD_TABLE_NAME);
try {
if (fs.exists(finalOutputPath)) {
fs.rename(finalOutputPath, oldTableDir);
movedToOldTable = fs.exists(oldTableDir);
} else { // if the parent does not exist, make its parent directory.
fs.mkdirs(finalOutputPath.getParent());
}
fs.rename(stagingResultDir, finalOutputPath);
committed = fs.exists(finalOutputPath);
} catch (IOException ioe) {
// recover the old table
if (movedToOldTable && !committed) {
fs.rename(oldTableDir, finalOutputPath);
}
}
} else {
FileStatus[] files = fs.listStatus(stagingResultDir);
for (FileStatus eachFile : files) {
Path targetFilePath = new Path(finalOutputPath, eachFile.getPath().getName());
if (fs.exists(targetFilePath)) {
targetFilePath =
new Path(
finalOutputPath, eachFile.getPath().getName() + "_" + System.currentTimeMillis());
}
fs.rename(eachFile.getPath(), targetFilePath);
}
}
}
/** Insert row values */
private void insertRowValues(
QueryContext queryContext,
InsertNode insertNode,
SubmitQueryResponse.Builder responseBuilder) {
try {
String nodeUniqName =
insertNode.getTableName() == null
? new Path(insertNode.getUri()).getName()
: insertNode.getTableName();
String queryId = nodeUniqName + "_" + System.currentTimeMillis();
URI finalOutputUri = insertNode.getUri();
Tablespace space = TablespaceManager.get(finalOutputUri).get();
TableMeta tableMeta = new TableMeta(insertNode.getStorageType(), insertNode.getOptions());
tableMeta.putOption(StorageConstants.INSERT_DIRECTLY, Boolean.TRUE.toString());
FormatProperty formatProperty = space.getFormatProperty(tableMeta);
TaskAttemptContext taskAttemptContext;
if (formatProperty
.directInsertSupported()) { // if this format and storage supports direct insertion
taskAttemptContext = new TaskAttemptContext(queryContext, null, null, null, null);
taskAttemptContext.setOutputPath(new Path(finalOutputUri));
EvalExprExec evalExprExec =
new EvalExprExec(taskAttemptContext, (EvalExprNode) insertNode.getChild());
InsertRowsExec exec = new InsertRowsExec(taskAttemptContext, insertNode, evalExprExec);
try {
exec.init();
exec.next();
} finally {
exec.close();
}
} else {
URI stagingSpaceUri =
space.prepareStagingSpace(context.getConf(), queryId, queryContext, tableMeta);
Path stagingDir = new Path(stagingSpaceUri);
Path stagingResultDir = new Path(stagingDir, TajoConstants.RESULT_DIR_NAME);
taskAttemptContext = new TaskAttemptContext(queryContext, null, null, null, stagingDir);
taskAttemptContext.setOutputPath(new Path(stagingResultDir, "part-01-000000"));
insertRowsThroughStaging(
taskAttemptContext, insertNode, new Path(finalOutputUri), stagingDir, stagingResultDir);
}
// set insert stats (how many rows and bytes)
TableStats stats = new TableStats();
stats.setNumBytes(taskAttemptContext.getResultStats().getNumBytes());
stats.setNumRows(taskAttemptContext.getResultStats().getNumRows());
if (insertNode.hasTargetTable()) {
CatalogProtos.UpdateTableStatsProto.Builder builder =
CatalogProtos.UpdateTableStatsProto.newBuilder();
builder.setTableName(insertNode.getTableName());
builder.setStats(stats.getProto());
catalog.updateTableStats(builder.build());
TableDesc desc =
new TableDesc(
insertNode.getTableName(), insertNode.getTargetSchema(), tableMeta, finalOutputUri);
responseBuilder.setTableDesc(desc.getProto());
} else { // If INSERT INTO LOCATION
// Empty TableDesc
List<CatalogProtos.ColumnProto> columns = new ArrayList<CatalogProtos.ColumnProto>();
CatalogProtos.TableDescProto tableDescProto =
CatalogProtos.TableDescProto.newBuilder()
.setTableName(nodeUniqName)
.setMeta(
CatalogProtos.TableProto.newBuilder()
.setStoreType(BuiltinStorages.TEXT)
.build())
.setSchema(CatalogProtos.SchemaProto.newBuilder().addAllFields(columns).build())
.setStats(stats.getProto())
.build();
responseBuilder.setTableDesc(tableDescProto);
}
// If queryId == NULL_QUERY_ID and MaxRowNum == -1, TajoCli prints only number of inserted
// rows.
responseBuilder.setMaxRowNum(-1);
responseBuilder.setQueryId(QueryIdFactory.NULL_QUERY_ID.getProto());
responseBuilder.setResultType(ResultType.NO_RESULT);
responseBuilder.setState(OK);
} catch (Throwable t) {
throw new RuntimeException(t);
}
}