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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.hudi.common.config;
/**
* In Hudi, we have multiple superclasses, aka Config Classes of {@link HoodieConfig} that maintain
* several configs. This class group one or more of these superclasses into higher
* level groups, such as Spark Config, Flink Configs, Metrics ....
* This class maintains the human readable name and description of each config group.
*/
public class ConfigGroups {
/**
* Config group names.
*/
public enum Names {
ENVIRONMENT_CONFIG("Environment Config"),
SPARK_DATASOURCE("Spark Datasource Configs"),
FLINK_SQL("Flink Sql Configs"),
WRITE_CLIENT("Write Client Configs"),
META_SYNC("Metastore and Catalog Sync Configs"),
METRICS("Metrics Configs"),
RECORD_PAYLOAD("Record Payload Config"),
KAFKA_CONNECT("Kafka Connect Configs"),
AWS("Amazon Web Services Configs");
public final String name;
Names(String name) {
this.name = name;
}
}
public enum SubGroupNames {
INDEX(
"Index Configs",
"Configurations that control indexing behavior, "
+ "which tags incoming records as either inserts or updates to older records."),
LOCK(
"Lock Configs",
"Configurations that control locking mechanisms required for concurrency control "
+ " between writers to a Hudi table. Concurrency between Hudi's own table services "
+ " are auto managed internally."),
COMMIT_CALLBACK(
"Commit Callback Configs",
"Configurations controlling callback behavior into HTTP endpoints, to push "
+ "notifications on commits on hudi tables."),
NONE(
"None",
"No subgroup. This description should be hidden.");
public final String name;
private final String description;
SubGroupNames(String name, String description) {
this.name = name;
this.description = description;
}
public String getDescription() {
return description;
}
}
public static String getDescription(Names names) {
String description;
switch (names) {
case ENVIRONMENT_CONFIG:
description = "Hudi supports passing configurations via a configuration file "
+ "`hudi-default.conf` in which each line consists of a key and a value "
+ "separated by whitespace or = sign. For example:\n"
+ "```\n"
+ "hoodie.datasource.hive_sync.mode jdbc\n"
+ "hoodie.datasource.hive_sync.jdbcurl jdbc:hive2://localhost:10000\n"
+ "hoodie.datasource.hive_sync.support_timestamp false\n"
+ "```\n"
+ "It helps to have a central configuration file for your common cross "
+ "job configurations/tunings, so all the jobs on your cluster can utilize it. "
+ "It also works with Spark SQL DML/DDL, and helps avoid having to pass configs "
+ "inside the SQL statements.\n\n"
+ "By default, Hudi would load the configuration file under `/etc/hudi/conf` "
+ "directory. You can specify a different configuration directory location by "
+ "setting the `HUDI_CONF_DIR` environment variable.";
break;
case SPARK_DATASOURCE:
description = "These configs control the Hudi Spark Datasource, "
+ "providing ability to define keys/partitioning, pick out the write operation, "
+ "specify how to merge records or choosing query type to read.";
break;
case FLINK_SQL:
description = "These configs control the Hudi Flink SQL source/sink connectors, "
+ "providing ability to define record keys, pick out the write operation, "
+ "specify how to merge records, enable/disable asynchronous compaction "
+ "or choosing query type to read.";
break;
case WRITE_CLIENT:
description = "Internally, the Hudi datasource uses a RDD based HoodieWriteClient API "
+ "to actually perform writes to storage. These configs provide deep control over "
+ "lower level aspects like file sizing, compression, parallelism, compaction, "
+ "write schema, cleaning etc. Although Hudi provides sane defaults, from time-time "
+ "these configs may need to be tweaked to optimize for specific workloads.";
break;
case META_SYNC:
description = "Configurations used by the Hudi to sync metadata to external metastores and catalogs.";
break;
case RECORD_PAYLOAD:
description = "This is the lowest level of customization offered by Hudi. "
+ "Record payloads define how to produce new values to upsert based on incoming "
+ "new record and stored old record. Hudi provides default implementations such as "
+ "OverwriteWithLatestAvroPayload which simply update table with the latest/last-written record. "
+ "This can be overridden to a custom class extending HoodieRecordPayload class, "
+ "on both datasource and WriteClient levels.";
break;
case METRICS:
description = "These set of configs are used to enable monitoring and reporting of key"
+ "Hudi stats and metrics.";
break;
case KAFKA_CONNECT:
description = "These set of configs are used for Kafka Connect Sink Connector for writing Hudi Tables";
break;
case AWS:
description = "Configurations specific to Amazon Web Services.";
break;
default:
description = "Please fill in the description for Config Group Name: " + names.name;
break;
}
return description;
}
}
