java.net.ConnectException: Connection refused

Google Groups | Hagen Rother | 4 months ago
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    More kafka indexer issues :)

    Google Groups | 4 months ago | Hagen Rother
    java.net.ConnectException: Connection refused
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    java.net.ConnectException: Connection refused
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    WSO2 Products with MySQL Error

    Stack Overflow | 3 years ago | Rafa Hernández
    org.wso2.carbon.user.core.UserStoreException: Database Error - Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
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    GitHub | 3 years ago | soulgriever
    com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

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Root Cause Analysis

  1. java.net.ConnectException

    Connection refused

    at java.net.PlainSocketImpl.socketConnect()
  2. Java RT
    Socket.<init>
    1. java.net.PlainSocketImpl.socketConnect(NativeMethod)[?:1.8.0_45]
    2. java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)[?:1.8.0_45]
    3. java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)[?:1.8.0_45]
    4. java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)[?:1.8.0_45]
    5. java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)[?:1.8.0_45]
    6. java.net.Socket.connect(Socket.java:589)[?:1.8.0_45]
    7. java.net.Socket.connect(Socket.java:538)[?:1.8.0_45]
    8. java.net.Socket.<init>(Socket.java:434)[?:1.8.0_45]
    9. java.net.Socket.<init>(Socket.java:211)[?:1.8.0_45]
    9 frames
  3. io.druid.indexing
    KafkaSupervisor$2.run
    1. io.druid.indexing.kafka.KafkaIndexTaskClient.checkConnection(KafkaIndexTaskClient.java:228)[?:?]
    2. io.druid.indexing.kafka.KafkaIndexTaskClient.submitRequest(KafkaIndexTaskClient.java:264)[?:?]
    3. io.druid.indexing.kafka.KafkaIndexTaskClient.submitRequest(KafkaIndexTaskClient.java:233)[druid-kafka-indexing-service-0.9.1.1.jar:0.9.1.1]
    4. io.druid.indexing.kafka.KafkaIndexTaskClient.getStartTime(KafkaIndexTaskClient.java:156)[druid-kafka-indexing-service-0.9.1.1.jar:0.9.1.1]
    5. io.druid.indexing.kafka.supervisor.KafkaSupervisor.getTaskStartTime(KafkaSupervisor.java:1218)[druid-kafka-indexing-service-0.9.1.1.jar:0.9.1.1]
    6. io.druid.indexing.kafka.supervisor.KafkaSupervisor.updateTaskStatus(KafkaSupervisor.java:708)[druid-kafka-indexing-service-0.9.1.1.jar:0.9.1.1]
    7. io.druid.indexing.kafka.supervisor.KafkaSupervisor.runInternal(KafkaSupervisor.java:457)[druid-kafka-indexing-service-0.9.1.1.jar:0.9.1.1]
    8. io.druid.indexing.kafka.supervisor.KafkaSupervisor$RunNotice.handle(KafkaSupervisor.java:409)[druid-kafka-indexing-service-0.9.1.1.jar:0.9.1.1]
    9. io.druid.indexing.kafka.supervisor.KafkaSupervisor$2.run(KafkaSupervisor.java:261)[druid-kafka-indexing-service-0.9.1.1.jar:0.9.1.1]
    9 frames
  4. Java RT
    Thread.run
    1. java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)[?:1.8.0_45]
    2. java.util.concurrent.FutureTask.run(FutureTask.java:266)[?:1.8.0_45]
    3. java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[?:1.8.0_45]
    4. java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[?:1.8.0_45]
    5. java.lang.Thread.run(Thread.java:745)[?:1.8.0_45]
    5 frames