/** {@inheritDoc} */
@Override
public void write(HFileKeyValue entry, NullWritable unused) throws IOException {
final ColumnId lgId = ColumnId.fromByteArray(entry.getFamily());
getWriter(lgId).write(entry, unused);
}
/** {@inheritDoc} */
@Override
public KijiTableLayout modifyTableLayout(
TableLayoutDesc update, boolean dryRun, PrintStream printStream) throws IOException {
final State state = mState.get();
Preconditions.checkState(
state == State.OPEN,
"Cannot modify table layout in Kiji instance %s in state %s.",
this,
state);
Preconditions.checkNotNull(update);
ensureValidationCompatibility(update);
if (dryRun && (null == printStream)) {
printStream = System.out;
}
final KijiMetaTable metaTable = getMetaTable();
final String tableName = update.getName();
// Throws a KijiTableNotFoundException if there is no table.
metaTable.getTableLayout(tableName);
final KijiURI tableURI = KijiURI.newBuilder(mURI).withTableName(tableName).build();
LOG.debug("Applying layout update {} on table {}", update, tableURI);
KijiTableLayout newLayout = null;
if (dryRun) {
// Process column ids and perform validation, but don't actually update the meta table.
final List<KijiTableLayout> layouts = metaTable.getTableLayoutVersions(tableName, 1);
final KijiTableLayout currentLayout = layouts.isEmpty() ? null : layouts.get(0);
newLayout = KijiTableLayout.createUpdatedLayout(update, currentLayout);
} else {
// Actually set it.
if (mSystemVersion.compareTo(Versions.SYSTEM_2_0) >= 0) {
try {
// Use ZooKeeper to inform all watchers that a new table layout is available.
final HBaseTableLayoutUpdater updater =
new HBaseTableLayoutUpdater(this, tableURI, update);
try {
updater.update();
newLayout = updater.getNewLayout();
} finally {
updater.close();
}
} catch (KeeperException ke) {
throw new IOException(ke);
}
} else {
// System versions before system-2.0 do not enforce table layout update consistency or
// validation.
newLayout = metaTable.updateTableLayout(tableName, update);
}
}
Preconditions.checkState(newLayout != null);
if (dryRun) {
printStream.println("This table layout is valid.");
}
LOG.debug("Computing new HBase schema");
final HTableSchemaTranslator translator = new HTableSchemaTranslator();
final HTableDescriptor newTableDescriptor =
translator.toHTableDescriptor(mURI.getInstance(), newLayout);
LOG.debug("Reading existing HBase schema");
final KijiManagedHBaseTableName hbaseTableName =
KijiManagedHBaseTableName.getKijiTableName(mURI.getInstance(), tableName);
HTableDescriptor currentTableDescriptor = null;
byte[] tableNameAsBytes = hbaseTableName.toBytes();
try {
currentTableDescriptor = getHBaseAdmin().getTableDescriptor(tableNameAsBytes);
} catch (TableNotFoundException tnfe) {
if (!dryRun) {
throw tnfe; // Not in dry-run mode; table needs to exist. Rethrow exception.
}
}
if (currentTableDescriptor == null) {
if (dryRun) {
printStream.println("Would create new table: " + tableName);
currentTableDescriptor =
HTableDescriptorComparator.makeEmptyTableDescriptor(hbaseTableName);
} else {
throw new RuntimeException(
"Table " + hbaseTableName.getKijiTableName() + " does not exist");
}
}
LOG.debug("Existing table descriptor: {}", currentTableDescriptor);
LOG.debug("New table descriptor: {}", newTableDescriptor);
LOG.debug("Checking for differences between the new HBase schema and the existing one");
final HTableDescriptorComparator comparator = new HTableDescriptorComparator();
if (0 == comparator.compare(currentTableDescriptor, newTableDescriptor)) {
LOG.debug("HBase schemas are the same. No need to change HBase schema");
if (dryRun) {
printStream.println("This layout does not require any physical table schema changes.");
}
} else {
LOG.debug("HBase schema must be changed, but no columns will be deleted");
if (dryRun) {
printStream.println("Changes caused by this table layout:");
} else {
LOG.debug("Disabling HBase table");
getHBaseAdmin().disableTable(hbaseTableName.toString());
}
for (HColumnDescriptor newColumnDescriptor : newTableDescriptor.getFamilies()) {
final String columnName = Bytes.toString(newColumnDescriptor.getName());
final ColumnId columnId = ColumnId.fromString(columnName);
final String lgName = newLayout.getLocalityGroupIdNameMap().get(columnId);
final HColumnDescriptor currentColumnDescriptor =
currentTableDescriptor.getFamily(newColumnDescriptor.getName());
if (null == currentColumnDescriptor) {
if (dryRun) {
printStream.println(" Creating new locality group: " + lgName);
} else {
LOG.debug("Creating new column " + columnName);
getHBaseAdmin().addColumn(hbaseTableName.toString(), newColumnDescriptor);
}
} else if (!newColumnDescriptor.equals(currentColumnDescriptor)) {
if (dryRun) {
printStream.println(" Modifying locality group: " + lgName);
} else {
LOG.debug("Modifying column " + columnName);
getHBaseAdmin().modifyColumn(hbaseTableName.toString(), newColumnDescriptor);
}
} else {
LOG.debug("No changes needed for column " + columnName);
}
}
if (dryRun) {
if (newTableDescriptor.getMaxFileSize() != currentTableDescriptor.getMaxFileSize()) {
printStream.printf(
" Changing max_filesize from %d to %d: %n",
currentTableDescriptor.getMaxFileSize(), newTableDescriptor.getMaxFileSize());
}
if (newTableDescriptor.getMaxFileSize() != currentTableDescriptor.getMaxFileSize()) {
printStream.printf(
" Changing memstore_flushsize from %d to %d: %n",
currentTableDescriptor.getMemStoreFlushSize(),
newTableDescriptor.getMemStoreFlushSize());
}
} else {
LOG.debug("Modifying table descriptor");
getHBaseAdmin().modifyTable(tableNameAsBytes, newTableDescriptor);
}
if (!dryRun) {
LOG.debug("Re-enabling HBase table");
getHBaseAdmin().enableTable(hbaseTableName.toString());
}
}
return newLayout;
}
