Solutions to common problems using Elasticsearch

1. Using it with redis will cause Netty startup conflicts, so you need to add a method in the ***Application entry file:

@PostConstruct
public void init() {
  // see Netty4Utils.setAvailableProcessors()
  System.setProperty("es.set.netty.runtime.available.processors", "false");
}

2. NoNodeAvailableException[None of the configured nodes are available: [{#transport#-1}{V4jtTT-tQQqULCNjSNSfgg}{192.168.116.128}{192.168.116.128:9300}]

Solution:

Replace the elasticsearch version that corresponds to your spring-boot-starter-data-elasticsearch.

3. OpenJDK 64-Bit Server VM warning: $ Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.

Solution:

Modify the contents of the jvm.options file to:

-XX:+UseConcMarkSweepGC is changed to -XX:+UseG1GC

4. Deleting Users

Before deleting a user, you need to kill the user's process

pkill or kill -9 <pid>

Example: Delete user user

userdel user

Example: Delete user user and delete his working directory at the same time

userdel –r user

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