/** Checks if a table is empty. */
public boolean isEmpty() throws IOException {
Bigquery.Tabledata.List list =
client.tabledata().list(ref.getProjectId(), ref.getDatasetId(), ref.getTableId());
list.setMaxResults(1L);
TableDataList dataList = list.execute();
return dataList.getRows() == null || dataList.getRows().isEmpty();
}
/**
* Tries to create the BigQuery table. If a table with the same name already exists in the
* dataset, the table creation fails, and the function returns null. In such a case, the existing
* table doesn't necessarily have the same schema as specified by the parameter.
*
* @param schema Schema of the new BigQuery table.
* @return The newly created BigQuery table information, or null if the table with the same name
* already exists.
* @throws IOException if other error than already existing table occurs.
*/
@Nullable
public Table tryCreateTable(TableSchema schema) throws IOException {
LOG.info("Trying to create BigQuery table: {}", BigQueryIO.toTableSpec(ref));
Table content = new Table();
content.setTableReference(ref);
content.setSchema(schema);
try {
return client.tables().insert(ref.getProjectId(), ref.getDatasetId(), content).execute();
} catch (IOException e) {
if (new ApiErrorExtractor().itemAlreadyExists(e)) {
LOG.info("The BigQuery table already exists.");
return null;
}
throw e;
}
}
/**
* Retrieves or creates the table.
*
* <p>The table is checked to conform to insertion requirements as specified by WriteDisposition
* and CreateDisposition.
*
* <p>If table truncation is requested (WriteDisposition.WRITE_TRUNCATE), then this will re-create
* the table if necessary to ensure it is empty.
*
* <p>If an empty table is required (WriteDisposition.WRITE_EMPTY), then this will fail if the
* table exists and is not empty.
*
* <p>When constructing a table, a {@code TableSchema} must be available. If a schema is provided,
* then it will be used. If no schema is provided, but an existing table is being cleared
* (WRITE_TRUNCATE option above), then the existing schema will be re-used. If no schema is
* available, then an {@code IOException} is thrown.
*/
public Table getOrCreateTable(
WriteDisposition writeDisposition,
CreateDisposition createDisposition,
@Nullable TableSchema schema)
throws IOException {
// Check if table already exists.
Bigquery.Tables.Get get =
client.tables().get(ref.getProjectId(), ref.getDatasetId(), ref.getTableId());
Table table = null;
try {
table = get.execute();
} catch (IOException e) {
ApiErrorExtractor errorExtractor = new ApiErrorExtractor();
if (!errorExtractor.itemNotFound(e)
|| createDisposition != CreateDisposition.CREATE_IF_NEEDED) {
// Rethrow.
throw e;
}
}
// If we want an empty table, and it isn't, then delete it first.
if (table != null) {
if (writeDisposition == WriteDisposition.WRITE_APPEND) {
return table;
}
boolean empty = isEmpty();
if (empty) {
if (writeDisposition == WriteDisposition.WRITE_TRUNCATE) {
LOG.info("Empty table found, not removing {}", BigQueryIO.toTableSpec(ref));
}
return table;
} else if (writeDisposition == WriteDisposition.WRITE_EMPTY) {
throw new IOException("WriteDisposition is WRITE_EMPTY, " + "but table is not empty");
}
// Reuse the existing schema if none was provided.
if (schema == null) {
schema = table.getSchema();
}
// Delete table and fall through to re-creating it below.
LOG.info("Deleting table {}", BigQueryIO.toTableSpec(ref));
Bigquery.Tables.Delete delete =
client.tables().delete(ref.getProjectId(), ref.getDatasetId(), ref.getTableId());
delete.execute();
}
if (schema == null) {
throw new IllegalArgumentException("Table schema required for new table.");
}
// Create the table.
return tryCreateTable(schema);
}
/** Insert all rows from the given list using specified insertIds if not null. */
public void insertAll(List<TableRow> rowList, @Nullable List<String> insertIdList)
throws IOException {
if (insertIdList != null && rowList.size() != insertIdList.size()) {
throw new AssertionError(
"If insertIdList is not null it needs to have at least " + "as many elements as rowList");
}
AttemptBoundedExponentialBackOff backoff =
new AttemptBoundedExponentialBackOff(
MAX_INSERT_ATTEMPTS, INITIAL_INSERT_BACKOFF_INTERVAL_MS);
final List<TableDataInsertAllResponse.InsertErrors> allErrors = new ArrayList<>();
// These lists contain the rows to publish. Initially the contain the entire list. If there are
// failures, they will contain only the failed rows to be retried.
List<TableRow> rowsToPublish = rowList;
List<String> idsToPublish = insertIdList;
while (true) {
final List<TableRow> retryRows = new ArrayList<>();
final List<String> retryIds = (idsToPublish != null) ? new ArrayList<String>() : null;
int strideIndex = 0;
// Upload in batches.
List<TableDataInsertAllRequest.Rows> rows = new LinkedList<>();
int dataSize = 0;
List<Future<?>> futures = new ArrayList<>();
for (int i = 0; i < rowsToPublish.size(); ++i) {
TableRow row = rowsToPublish.get(i);
TableDataInsertAllRequest.Rows out = new TableDataInsertAllRequest.Rows();
if (idsToPublish != null) {
out.setInsertId(idsToPublish.get(i));
}
out.setJson(row.getUnknownKeys());
rows.add(out);
dataSize += row.toString().length();
if (dataSize >= UPLOAD_BATCH_SIZE_BYTES
|| rows.size() >= maxRowsPerBatch
|| i == rowsToPublish.size() - 1) {
TableDataInsertAllRequest content = new TableDataInsertAllRequest();
content.setRows(rows);
final Bigquery.Tabledata.InsertAll insert =
client
.tabledata()
.insertAll(ref.getProjectId(), ref.getDatasetId(), ref.getTableId(), content);
final int finalStrideIndex = strideIndex;
final List<TableRow> finalRowsToPublish = rowsToPublish;
final List<String> finalIdsToPublish = idsToPublish;
futures.add(
executor.submit(
new Runnable() {
@Override
public void run() {
try {
TableDataInsertAllResponse response = insert.execute();
List<TableDataInsertAllResponse.InsertErrors> errors =
response.getInsertErrors();
if (errors != null) {
synchronized (this) {
allErrors.addAll(errors);
for (TableDataInsertAllResponse.InsertErrors error : errors) {
if (error.getIndex() == null) {
throw new IOException("Insert failed: " + allErrors);
}
int errorIndex = error.getIndex().intValue() + finalStrideIndex;
retryRows.add(finalRowsToPublish.get(errorIndex));
if (retryIds != null) {
retryIds.add(finalIdsToPublish.get(errorIndex));
}
}
}
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}));
dataSize = 0;
strideIndex = i + 1;
rows = new LinkedList<>();
}
}
try {
for (Future<?> future : futures) {
future.get();
}
} catch (InterruptedException e) {
} catch (ExecutionException e) {
Throwables.propagate(e.getCause());
}
if (!allErrors.isEmpty() && !backoff.atMaxAttempts()) {
try {
Thread.sleep(backoff.nextBackOffMillis());
} catch (InterruptedException e) {
// ignore.
}
LOG.info("Retrying failed inserts to BigQuery");
rowsToPublish = retryRows;
idsToPublish = retryIds;
allErrors.clear();
} else {
break;
}
}
if (!allErrors.isEmpty()) {
throw new IOException("Insert failed: " + allErrors);
}
}