[jira] [Updated] (FLINK-17638) FlinkKafkaConsumerBase restore from empty state will be set consume from earliest forced

["Flink Jira Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-17638?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Flink Jira Bot updated FLINK-17638:
-----------------------------------
    Labels: auto-deprioritized-major stale-minor  (was: auto-deprioritized-major)

I am the [Flink Jira Bot|https://github.com/apache/flink-jira-bot/] and I help the community manage its development. I see this issues has been marked as Minor but is unassigned and neither itself nor its Sub-Tasks have been updated for 180 days. I have gone ahead and marked it "stale-minor". If this ticket is still Minor, please either assign yourself or give an update. Afterwards, please remove the label or in 7 days the issue will be deprioritized.


> FlinkKafkaConsumerBase restore from empty state will be set consume from earliest forced
> ----------------------------------------------------------------------------------------
>
>                 Key: FLINK-17638
>                 URL: https://issues.apache.org/jira/browse/FLINK-17638
>             Project: Flink
>          Issue Type: Bug
>          Components: Connectors / Kafka
>    Affects Versions: 1.9.0, 1.9.3, 1.10.0
>         Environment: Flink 1.9.0
> kafka 1.1.0
> jdk 1.8
>            Reporter: chenchuangchuang
>            Priority: Minor
>              Labels: auto-deprioritized-major, stale-minor
>
> my work target and data  is like this    :
>  # i need count the number of post per user create last 30 days in my system
>  # the total and realtime data is in MYSQL
>  # i can get increment MYSQL binlog  from  kafka-1.1.1 ( it just  store the last 7 days binlog), the topic name is "binlog_post_topic"
>  # so , i have to combine the MYSQL data and the binlog data
>  
> i do it in this way:
>  # first , i carry a snapshot of MYSQL data to kafka  topic in order of create_time ( topic name is "init-post-topic"), and consume from kafka topic    "init-post-topic" as flink data-stream with the SlidingEventTimeWindows
>  # second, after the task do all the data in the topic "init-post-topic" , i create a save point for the task , call the save point  save-point-a
>  # third, i modify my code ,
>  ## the data source is "binlog_post_topic"  topic of kafka ,
>  ## other operotor will not change,
>  ## and the "binlog_post_topic"  is setted consuming  from  special timestamp (when the snapshot of MYSQL create )
>  # forth, i restart my task from save-point-a
> but i find the kafka consumer for the "binlog_post_topic" do not consume data from the timestamp i setted, but from the earlist,  i find the log in the task manager 
> {code:java}
> //代码占位符
> 2020-05-11 17:20:47,228 INFO  org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase  - Consumer subtask 0 restored state: {}.
> ...
> 2020-05-12 20:14:52,641 INFO  org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase  - Consumer subtask 0 will start reading 1 partitions with offsets in restored state: {KafkaTopicPartition{topic='binlog_post_topic', partition=0}=-915623761775}
> 2020-05-11 17:20:47,414 INFO  org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase  - Consumer subtask 0 creating fetcher with offsets {KafkaTopicPartition{topic='binlog_post_topic', partition=0}=-915623761775}.
> {code}
> i guess this may be caused by the FlinkKafkaConsumerBase
>  then i find code like this 
> in the method FlinkKafkaConsumerBase.initializeState()
> {code:java}
> //代码占位符
> if (context.isRestored() && !restoredFromOldState) {
>    restoredState = new TreeMap<>(new KafkaTopicPartition.Comparator());
> ....{code}
> this code mean that  if a task is restart from the save point ,that restoredState will not be null, at least be an empty TreeMap;
> and in FlinkKafkaConsumerBase.open()
> {code:java}
> //代码占位符
> if (restoredState != null) {
>    for (KafkaTopicPartition partition : allPartitions) {
>       if (!restoredState.containsKey(partition)) {
>          restoredState.put(partition, KafkaTopicPartitionStateSentinel.EARLIEST_OFFSET);
>       }
>    }
> {code}
> in this place will init the consumer , if a task is restart from a save-point , restoredState at least  is an empty TreeMap, then in this code , the consumer will be setted consume from 
> KafkaTopicPartitionStateSentinel.EARLIEST_OFFSET
> i change this code like this 
> {code:java}
> //代码占位符
> if (restoredState != null && !restoredState.isEmpty()) {
> ....
> {code}
>  
> and this work well for me .
>  
> 刚注意到这是一个中文jira, 哭晕
>  
>  
>  
>  



--
This message was sent by Atlassian Jira
(v8.3.4#803005)