org.apache.iceberg.flink.sink.CachingTableSupplier Maven / Gradle / Ivy
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* 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.iceberg.flink.sink;
import java.time.Duration;
import org.apache.flink.util.Preconditions;
import org.apache.iceberg.SerializableTable;
import org.apache.iceberg.Table;
import org.apache.iceberg.flink.TableLoader;
import org.apache.iceberg.util.DateTimeUtil;
import org.apache.iceberg.util.SerializableSupplier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A table loader that will only reload a table after a certain interval has passed. WARNING: This
* table loader should be used carefully when used with writer tasks. It could result in heavy load
* on a catalog for jobs with many writers.
*/
class CachingTableSupplier implements SerializableSupplier {
private static final Logger LOG = LoggerFactory.getLogger(CachingTableSupplier.class);
private final Table initialTable;
private final TableLoader tableLoader;
private final Duration tableRefreshInterval;
private long lastLoadTimeMillis;
private transient Table table;
CachingTableSupplier(
SerializableTable initialTable, TableLoader tableLoader, Duration tableRefreshInterval) {
Preconditions.checkArgument(initialTable != null, "initialTable cannot be null");
Preconditions.checkArgument(tableLoader != null, "tableLoader cannot be null");
Preconditions.checkArgument(
tableRefreshInterval != null, "tableRefreshInterval cannot be null");
this.initialTable = initialTable;
this.table = initialTable;
this.tableLoader = tableLoader;
this.tableRefreshInterval = tableRefreshInterval;
this.lastLoadTimeMillis = System.currentTimeMillis();
}
@Override
public Table get() {
if (table == null) {
this.table = initialTable;
}
return table;
}
Table initialTable() {
return initialTable;
}
void refreshTable() {
if (System.currentTimeMillis() > lastLoadTimeMillis + tableRefreshInterval.toMillis()) {
try {
if (!tableLoader.isOpen()) {
tableLoader.open();
}
this.table = tableLoader.loadTable();
this.lastLoadTimeMillis = System.currentTimeMillis();
LOG.info(
"Table {} reloaded, next min load time threshold is {}",
table.name(),
DateTimeUtil.formatTimestampMillis(
lastLoadTimeMillis + tableRefreshInterval.toMillis()));
} catch (Exception e) {
LOG.warn("An error occurred reloading table {}, table was not reloaded", table.name(), e);
}
}
}
}
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