jackjlli commented on a change in pull request #3568: Add guava cache to cache table schema in pinot broker URL: https://github.com/apache/incubator-pinot/pull/3568#discussion_r238044473
########## File path: pinot-broker/src/main/java/com/linkedin/pinot/broker/requesthandler/TableSchemaCache.java ########## @@ -0,0 +1,67 @@ +/** + * Copyright (C) 2014-2018 LinkedIn Corp. ([email protected]) + * + * Licensed 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 com.linkedin.pinot.broker.requesthandler; + +import com.google.common.cache.CacheBuilder; +import com.google.common.cache.CacheLoader; +import com.google.common.cache.LoadingCache; +import com.linkedin.pinot.common.config.TableNameBuilder; +import com.linkedin.pinot.common.data.Schema; +import com.linkedin.pinot.common.metadata.ZKMetadataProvider; +import java.util.concurrent.TimeUnit; +import org.apache.helix.ZNRecord; +import org.apache.helix.store.zk.ZkHelixPropertyStore; + + +public class TableSchemaCache { + private static final long DEFAULT_CACHE_SIZE = 50; + private static final long DEFAULT_CACHE_TIMEOUT_IN_MINUTE = 60; + + private final LoadingCache<String, Schema> _tableSchemaCache; + private final ZkHelixPropertyStore<ZNRecord> _propertyStore; + + TableSchemaCache(ZkHelixPropertyStore<ZNRecord> propertyStore) { + _propertyStore = propertyStore; + _tableSchemaCache = CacheBuilder.newBuilder() + .maximumSize(DEFAULT_CACHE_SIZE) + .expireAfterWrite(DEFAULT_CACHE_TIMEOUT_IN_MINUTE, TimeUnit.MINUTES) + .build(new CacheLoader<String, Schema>() { + @Override + public Schema load(String rawTableName) { + return ZKMetadataProvider.getTableSchema(_propertyStore, rawTableName); + } + }); + + } + + /** + * Refreshes table schema. + * @param tableName Table name with or without type suffix. + */ + public void refreshTableSchema(String tableName) { Review comment: Thanks for reminding. 👍 ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
