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  1. Flink
  2. FLINK-25211

Elasticsearch connector version compatibility

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      Hi there, let's say I'm writing a Flink job that wants to insert data into Elastic and I'm importing the Elastic rest client for Flink in my job.

       

      Specifically I have this at the moment, but my deployed Elasticsearch version is 7.15.1 (more on this shortly):

       

          <dependency>
              <groupId>org.elasticsearch.client</groupId>
              <artifactId>elasticsearch-rest-high-level-client</artifactId>
              <version>7.10.1</version>
            </dependency>

       

      I know that works just fine when I'm deployed Elasticsearch 7.8.x, but when I switch to using Elasticsearch 7.15.1, I've noticed intermittent issues with authorisation (401s come back and headers are not added to subsequent requests, and so we have to implement retries in our Flink configuration and/or the Flink job itself). 

       

      While there may be an issue with the particular code I'm writing (we have our own security plugin), I do then have questions around which versions of Elasticsearch our connector in Flink is known to work with.

       

      Let's say I upgrade the Flink rest client version to be 7.15.1 - to match my Elasticsearch version, which might seem sensible.

       

      If I do that, my JobManagers immediately crash because TimeValue has moved in the Elasticsearch code: see here https://github.com/elastic/elasticsearch/commit/68817d7ca29c264b3ea3f766737d81e2ebb4028c#diff-d8695a17187facb254e5ba4b900c7d5a555e5ae5377f38704209e5e064ea630e

       

      Specifically we see this at startup:

       

      java.lang.NoClassDefFoundError: org.elasticsearch.common.unit.TimeValueat org.apache.flink.streaming.connectors.elasticsearch.ElasticsearchSinkBase.configureFlushInterval(ElasticsearchSinkBase.java:420) ~[?:?]at org.apache.flink.streaming.connectors.elasticsearch.ElasticsearchSinkBase.buildBulkProcessor(ElasticsearchSinkBase.java:393) ~[?:?]at org.apache.flink.streaming.connectors.elasticsearch.ElasticsearchSinkBase.open(ElasticsearchSinkBase.java:319) ~[?:?]at org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:34) ~[flink-dist_2.11-1.13.2.jar:1.13.2]at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.open(AbstractUdfStreamOperator.java:102) ~[flink-dist_2.11-1.13.2.jar:1.13.2]at org.apache.flink.streaming.api.operators.StreamSink.open(StreamSink.java:46) ~[flink-dist_2.11-1.13.2.jar:1.13.2]at org.apache.flink.streaming.runtime.tasks.OperatorChain.initializeStateAndOpenOperators(OperatorChain.java:442) ~[flink-dist_2.11-1.13.2.jar:1.13.2]at org.apache.flink.streaming.runtime.tasks.StreamTask.restoreGates(StreamTask.java:582) ~[flink-dist_2.11-1.13.2.jar:1.13.2]at <unknown class>.call(Unknown Source) ~[?:?]at org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$SynchronizedStreamTaskActionExecutor.call(StreamTaskActionExecutor.java:100) ~[flink-dist_2.11-1.13.2.jar:1.13.2]at org.apache.flink.streaming.runtime.tasks.StreamTask.executeRestore(StreamTask.java:562) ~[flink-dist_2.11-1.13.2.jar:1.13.2]at <unknown class>.run(Unknown Source) ~[?:?]at org.apache.flink.streaming.runtime.tasks.StreamTask.runWithCleanUpOnFail(StreamTask.java:647) ~[flink-dist_2.11-1.13.2.jar:1.13.2]at org.apache.flink.streaming.runtime.tasks.StreamTask.restore(StreamTask.java:537) ~[flink-dist_2.11-1.13.2.jar:1.13.2]at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:759) ~[flink-dist_2.11-1.13.2.jar:1.13.2]at org.apache.flink.runtime.taskmanager.Task.run(Task.java:566) ~[flink-dist_2.11-1.13.2.jar:1.13.2]at java.lang.Thread.run(Unknown Source) ~[?:?]Caused by: java.lang.ClassNotFoundException: org.elasticsearch.common.unit.TimeValueat java.net.URLClassLoader.findClass(Unknown Source) ~[?:?]at java.lang.ClassLoader.loadClassHelper(Unknown Source) ~[?:?]at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:?] (omitted the rest for brevity - although this is still quite long)

       

      and so I think - fine, what does the documentation say? 

       

      If we look at find https://github.com/apache/flink/blob/master/docs/content/docs/connectors/datastream/elasticsearch.md - this states 7.5.1 of Elasticsearch. 

       

      And then if we look here, we see that the old package for TimeValue is present in the current connector code for Flink https://github.com/apache/flink/blob/master/flink-connectors/flink-connector-elasticsearch-base/src/main/java/org/apache/flink/streaming/connectors/elasticsearch/ElasticsearchSinkBase.java#L40.

       

      And this leads me to this JIRA post: is the current documentation accurate in that we can only use up to Elasticsearch 7.5.1, reliably, with the connector code in Flink? 

       

      What is the "lay of the land" insofar as the Flink community and Elastic; is this an area that's actively looked into or is the general consensus that one should write their own connector of sorts? 

       

      Are there plans to increase said version? Does it have to be this for a particular reason?

       

      Many thanks in advance, I can say that we've been using the 7.8 client just fine but the move to test with Elasticsearch 7.15 has come with a few challenges and so I'm hoping the Flink community can possibly some shed some light in this direction.

       

      Cheers,

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            aroberts Adam Roberts
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