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In the current design, brokers query both data nodes and tasks to fetch the schema of the segments they serve. The table schema is then constructed by combining the schemas of all segments within a datasource. However, this approach leads to a high number of segment metadata queries during broker startup, resulting in slow startup times and various issues outlined in the design proposal. To address these challenges, we propose centralizing the table schema management process within the coordinator. This change is the first step in that direction. In the new arrangement, the coordinator will take on the responsibility of querying both data nodes and tasks to fetch segment schema and subsequently building the table schema. Brokers will now simply query the Coordinator to fetch table schema. Importantly, brokers will still retain the capability to build table schemas if the need arises, ensuring both flexibility and resilience.
21 lines
6.6 KiB
SQL
21 lines
6.6 KiB
SQL
-- Licensed to the Apache Software Foundation (ASF) under one or more
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-- contributor license agreements. See the NOTICE file distributed with
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-- this work for additional information regarding copyright ownership.
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-- The ASF licenses this file to You under the Apache License, Version 2.0
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-- (the "License"); you may not use this file except in compliance with
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-- the License. You may obtain a copy of the License at
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--
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-- http://www.apache.org/licenses/LICENSE-2.0
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--
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-- Unless required by applicable law or agreed to in writing, software
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-- distributed under the License is distributed on an "AS IS" BASIS,
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-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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-- See the License for the specific language governing permissions and
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-- limitations under the License.
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INSERT INTO druid_segments (id,dataSource,created_date,start,end,partitioned,version,used,payload,used_status_last_updated) VALUES ('twitterstream_2013-01-01T00:00:00.000Z_2013-01-02T00:00:00.000Z_2013-01-02T04:13:41.980Z_v9','twitterstream','2013-05-13T01:08:18.192Z','2013-01-01T00:00:00.000Z','2013-01-02T00:00:00.000Z',0,'2013-01-02T04:13:41.980Z_v9',1,'{\"dataSource\":\"twitterstream\",\"interval\":\"2013-01-01T00:00:00.000Z/2013-01-02T00:00:00.000Z\",\"version\":\"2013-01-02T04:13:41.980Z_v9\",\"loadSpec\":{\"type\":\"s3_zip\",\"bucket\":\"static.druid.io\",\"key\":\"data/segments/twitterstream/2013-01-01T00:00:00.000Z_2013-01-02T00:00:00.000Z/2013-01-02T04:13:41.980Z_v9/0/index.zip\"},\"dimensions\":\"has_links,first_hashtag,user_time_zone,user_location,has_mention,user_lang,rt_name,user_name,is_retweet,is_viral,has_geo,url_domain,user_mention_name,reply_to_name\",\"metrics\":\"count,tweet_length,num_followers,num_links,num_mentions,num_hashtags,num_favorites,user_total_tweets\",\"shardSpec\":{\"type\":\"none\"},\"binaryVersion\":9,\"size\":445235220,\"identifier\":\"twitterstream_2013-01-01T00:00:00.000Z_2013-01-02T00:00:00.000Z_2013-01-02T04:13:41.980Z_v9\"}','1970-01-01T00:00:00.000Z');
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INSERT INTO druid_segments (id,dataSource,created_date,start,end,partitioned,version,used,payload,used_status_last_updated) VALUES ('twitterstream_2013-01-02T00:00:00.000Z_2013-01-03T00:00:00.000Z_2013-01-03T03:44:58.791Z_v9','twitterstream','2013-05-13T00:03:28.640Z','2013-01-02T00:00:00.000Z','2013-01-03T00:00:00.000Z',0,'2013-01-03T03:44:58.791Z_v9',1,'{\"dataSource\":\"twitterstream\",\"interval\":\"2013-01-02T00:00:00.000Z/2013-01-03T00:00:00.000Z\",\"version\":\"2013-01-03T03:44:58.791Z_v9\",\"loadSpec\":{\"type\":\"s3_zip\",\"bucket\":\"static.druid.io\",\"key\":\"data/segments/twitterstream/2013-01-02T00:00:00.000Z_2013-01-03T00:00:00.000Z/2013-01-03T03:44:58.791Z_v9/0/index.zip\"},\"dimensions\":\"has_links,first_hashtag,user_time_zone,user_location,has_mention,user_lang,rt_name,user_name,is_retweet,is_viral,has_geo,url_domain,user_mention_name,reply_to_name\",\"metrics\":\"count,tweet_length,num_followers,num_links,num_mentions,num_hashtags,num_favorites,user_total_tweets\",\"shardSpec\":{\"type\":\"none\"},\"binaryVersion\":9,\"size\":435325540,\"identifier\":\"twitterstream_2013-01-02T00:00:00.000Z_2013-01-03T00:00:00.000Z_2013-01-03T03:44:58.791Z_v9\"}','1970-01-01T00:00:00.000Z');
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INSERT INTO druid_segments (id,dataSource,created_date,start,end,partitioned,version,used,payload,used_status_last_updated) VALUES ('twitterstream_2013-01-03T00:00:00.000Z_2013-01-04T00:00:00.000Z_2013-01-04T04:09:13.590Z_v9','twitterstream','2013-05-13T00:03:48.807Z','2013-01-03T00:00:00.000Z','2013-01-04T00:00:00.000Z',0,'2013-01-04T04:09:13.590Z_v9',1,'{\"dataSource\":\"twitterstream\",\"interval\":\"2013-01-03T00:00:00.000Z/2013-01-04T00:00:00.000Z\",\"version\":\"2013-01-04T04:09:13.590Z_v9\",\"loadSpec\":{\"type\":\"s3_zip\",\"bucket\":\"static.druid.io\",\"key\":\"data/segments/twitterstream/2013-01-03T00:00:00.000Z_2013-01-04T00:00:00.000Z/2013-01-04T04:09:13.590Z_v9/0/index.zip\"},\"dimensions\":\"has_links,first_hashtag,user_time_zone,user_location,has_mention,user_lang,rt_name,user_name,is_retweet,is_viral,has_geo,url_domain,user_mention_name,reply_to_name\",\"metrics\":\"count,tweet_length,num_followers,num_links,num_mentions,num_hashtags,num_favorites,user_total_tweets\",\"shardSpec\":{\"type\":\"none\"},\"binaryVersion\":9,\"size\":411651320,\"identifier\":\"twitterstream_2013-01-03T00:00:00.000Z_2013-01-04T00:00:00.000Z_2013-01-04T04:09:13.590Z_v9\"}','1970-01-01T00:00:00.000Z');
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INSERT INTO druid_segments (id,dataSource,created_date,start,end,partitioned,version,used,payload,used_status_last_updated) VALUES ('wikipedia_editstream_2012-12-29T00:00:00.000Z_2013-01-10T08:00:00.000Z_2013-01-10T08:13:47.830Z_v9','wikipedia_editstream','2013-03-15T20:49:52.348Z','2012-12-29T00:00:00.000Z','2013-01-10T08:00:00.000Z',0,'2013-01-10T08:13:47.830Z_v9',1,'{\"dataSource\":\"wikipedia_editstream\",\"interval\":\"2012-12-29T00:00:00.000Z/2013-01-10T08:00:00.000Z\",\"version\":\"2013-01-10T08:13:47.830Z_v9\",\"loadSpec\":{\"type\":\"s3_zip\",\"bucket\":\"static.druid.io\",\"key\":\"data/segments/wikipedia_editstream/2012-12-29T00:00:00.000Z_2013-01-10T08:00:00.000Z/2013-01-10T08:13:47.830Z_v9/0/index.zip\"},\"dimensions\":\"anonymous,area_code,city,continent_code,country_name,dma_code,geo,language,namespace,network,newpage,page,postal_code,region_lookup,robot,unpatrolled,user\",\"metrics\":\"added,count,deleted,delta,delta_hist,unique_users,variation\",\"shardSpec\":{\"type\":\"none\"},\"binaryVersion\":9,\"size\":446027801,\"identifier\":\"wikipedia_editstream_2012-12-29T00:00:00.000Z_2013-01-10T08:00:00.000Z_2013-01-10T08:13:47.830Z_v9\"}','1970-01-01T00:00:00.000Z');
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INSERT INTO druid_segments (id, dataSource, created_date, start, end, partitioned, version, used, payload,used_status_last_updated) VALUES ('wikipedia_2013-08-01T00:00:00.000Z_2013-08-02T00:00:00.000Z_2013-08-08T21:22:48.989Z', 'wikipedia', '2013-08-08T21:26:23.799Z', '2013-08-01T00:00:00.000Z', '2013-08-02T00:00:00.000Z', '0', '2013-08-08T21:22:48.989Z', '1', '{\"dataSource\":\"wikipedia\",\"interval\":\"2013-08-01T00:00:00.000Z/2013-08-02T00:00:00.000Z\",\"version\":\"2013-08-08T21:22:48.989Z\",\"loadSpec\":{\"type\":\"s3_zip\",\"bucket\":\"static.druid.io\",\"key\":\"data/segments/wikipedia/20130801T000000.000Z_20130802T000000.000Z/2013-08-08T21_22_48.989Z/0/index.zip\"},\"dimensions\":\"dma_code,continent_code,geo,area_code,robot,country_name,network,city,namespace,anonymous,unpatrolled,page,postal_code,language,newpage,user,region_lookup\",\"metrics\":\"count,delta,variation,added,deleted\",\"shardSpec\":{\"type\":\"none\"},\"binaryVersion\":9,\"size\":24664730,\"identifier\":\"wikipedia_2013-08-01T00:00:00.000Z_2013-08-02T00:00:00.000Z_2013-08-08T21:22:48.989Z\"}','1970-01-01T00:00:00.000Z');
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