Redis health check failed ConcurrentModificationException: null

[frank young]

Bug Report

[http-nio-11943-exec-2] [] Redis health check failed
java.util.ConcurrentModificationException: null
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909) ~[?:1.8.0_221]
at java.util.ArrayList$Itr.next(ArrayList.java:859) ~[?:1.8.0_221]
at org.springframework.data.redis.connection.lettuce.LettuceConverters$1.convert(LettuceConverters.java:226) ~[spring-data-redis-2.1.5.RELEASE.jar!/:2.1.5.RELEASE]
at org.springframework.data.redis.connection.lettuce.LettuceConverters$1.convert(LettuceConverters.java:217) ~[spring-data-redis-2.1.5.RELEASE.jar!/:2.1.5.RELEASE]
at org.springframework.data.redis.connection.lettuce.LettuceConverters.partitionsToClusterNodes(LettuceConverters.java:716) ~[spring-data-redis-2.1.5.RELEASE.jar!/:2.1.5.RELEASE]
at org.springframework.data.redis.connection.lettuce.LettuceClusterTopologyProvider.getTopology(LettuceClusterTopologyProvider.java:53) ~[spring-data-redis-2.1.5.RELEASE.jar!/:2.1.5.RELEASE]
at org.springframework.data.redis.connection.ClusterCommandExecutor.getClusterTopology(ClusterCommandExecutor.java:332) ~[spring-data-redis-2.1.5.RELEASE.jar!/:2.1.5.RELEASE]
at org.springframework.data.redis.connection.ClusterCommandExecutor.executeCommandOnArbitraryNode(ClusterCommandExecutor.java:110) ~[spring-data-redis-2.1.5.RELEASE.jar!/:2.1.5.RELEASE]
at org.springframework.data.redis.connection.lettuce.LettuceClusterConnection.clusterGetClusterInfo(LettuceClusterConnection.java:351) ~[spring-data-redis-2.1.5.RELEASE.jar!/:2.1.5.RELEASE]
at org.springframework.boot.actuate.redis.RedisHealthIndicator.doHealthCheck(RedisHealthIndicator.java:58) ~[spring-boot-actuator-2.1.6.RELEASE.jar!/:2.1.6.RELEASE]

Current Behavior

Configured LettuceClientConfiguration and set topology refresh, but in high concurrency scenarios, occasionally prompts this error, would like to help analyse the cause, thanks.

Stack trace

Input Code

Input Code

    public LettuceClientConfiguration clientConfiguration(ClientResources clientResources,GenericObjectPoolConfig genericObjectPoolConfig) {
        ClusterTopologyRefreshOptions topologyRefreshOptions= ClusterTopologyRefreshOptions.builder()
                .enablePeriodicRefresh(Duration.ofSeconds(period))
                .enableAllAdaptiveRefreshTriggers().build();

        ClusterClientOptions clusterClientOptions = ClusterClientOptions.builder()
                .timeoutOptions(TimeoutOptions.enabled(Duration.ofSeconds(period)))
                .topologyRefreshOptions(topologyRefreshOptions)
                .build();
        LettuceClientConfiguration  lettuceClientConfiguration = LettucePoolingClientConfiguration.builder()
                .commandTimeout(Duration.ofSeconds(timeout))
                .clientResources(clientResources)
                .clientOptions(clusterClientOptions)
                .poolConfig(genericObjectPoolConfig)
                .build();
        return lettuceClientConfiguration;
    }

Expected behavior/code

Environment

• lettuce-core:5.1.7.RELEASE
• spring-data-redis:2.1.9.RELEASE
• spring-boot-starter-data-redis:2.1.6.RELEASE
• jdk8

[Tihomir Krasimirov Mateev]

Hey @FrankCy,
from the stacktrace I can only assume you are having issue with the Spring Data Redis and not the Lettuce drive itself? Perhaps this issue would be better suited there?