[ZOOKEEPER-4238] NullPointerException in ContainerManager is still a thing

• Type: Bug
• Status: Open
• Priority: Blocker
• Resolution: Unresolved
• Affects Version/s: 3.5.9, 3.6.2

Environment

• Macbook Pro M1 2020
• Docker Desktop preview 3.1.0 (2021-02-11)
• Docker image zookeeper:3.6.2 (LATEST) on OS/ARCH: linux/arm64/v8

I'm starting the instance with

> docker-compose up zookeeper

version: '3.5'

services:

  zookeeper:
    image: zookeeper
    container_name: COMPANY-zookeeper
    restart: unless-stopped
    hostname: zookeeper
    ports:
      - "2181:2181"
    environment:
      ZOO_PORT: 2181
      ZOO_SERVERS: server.1=zookeeper:2888:3888
    volumes:
      - ../.env/zookeeper_data:/var/lib/zookeeper/data
      - ../.env/zookeeper_txn_logs:/var/lib/zookeeper/log
    networks:
      - COMPANY

• Assignee: Unassigned
• Reporter: Johan Forssell
• Created: 09/Mar/21 08:31
• Updated: 04/Nov/21 03:13

Description

I'm running Zookeeper from the latest docker image. Also tried 3.5.9.

After 1 minute I´m getting the same error as in ZOOKEEPER-2464: NPE in ContainerManager.getCandidates(ContainerManager.java:161)

...
COMPANY-zookeeper | 2021-03-09 07:57:21,320 [myid:1] - INFO  [main:Server@399] - Started @445ms
COMPANY-zookeeper | 2021-03-09 07:57:21,320 [myid:1] - INFO  [main:JettyAdminServer@182] - Started AdminServer on address 0.0.0.0, port 8080 and command URL /commands
COMPANY-zookeeper | 2021-03-09 07:57:21,321 [myid:1] - INFO  [main:ContainerManager@83] - Using checkIntervalMs=60000 maxPerMinute=10000 maxNeverUsedIntervalMs=0
COMPANY-zookeeper | 2021-03-09 07:57:21,322 [myid:1] - INFO  [main:ZKAuditProvider@42] - ZooKeeper audit is disabled.
COMPANY-zookeeper | 2021-03-09 07:58:21,331 [myid:1] - ERROR [ContainerManagerTask:ContainerManager$1@102] - Error checking containers
COMPANY-zookeeper | java.lang.NullPointerException
COMPANY-zookeeper | 	at org.apache.zookeeper.server.ContainerManager.getCandidates(ContainerManager.java:161)
COMPANY-zookeeper | 	at org.apache.zookeeper.server.ContainerManager.checkContainers(ContainerManager.java:128)
COMPANY-zookeeper | 	at org.apache.zookeeper.server.ContainerManager$1.run(ContainerManager.java:96)
COMPANY-zookeeper | 	at java.base/java.util.TimerThread.mainLoop(Unknown Source)
COMPANY-zookeeper | 	at java.base/java.util.TimerThread.run(Unknown Source)
COMPANY-zookeeper | 2021-03-09 07:59:21,326 [myid:1] - ERROR [ContainerManagerTask:ContainerManager$1@102] - Error checking containers
COMPANY-zookeeper | java.lang.NullPointerException
COMPANY-zookeeper | 	at org.apache.zookeeper.server.ContainerManager.getCandidates(ContainerManager.java:161)
COMPANY-zookeeper | 	at org.apache.zookeeper.server.ContainerManager.checkContainers(ContainerManager.java:128)
COMPANY-zookeeper | 	at org.apache.zookeeper.server.ContainerManager$1.run(ContainerManager.java:96)
COMPANY-zookeeper | 	at java.base/java.util.TimerThread.mainLoop(Unknown Source)
COMPANY-zookeeper | 	at java.base/java.util.TimerThread.run(Unknown Source)
COMPANY-zookeeper | 2021-03-09 08:00:21,325 [myid:1] - ERROR [ContainerManagerTask:ContainerManager$1@102] - Error checking containers
COMPANY-zookeeper | java.lang.NullPointerException
COMPANY-zookeeper | 	at org.apache.zookeeper.server.ContainerManager.getCandidates(ContainerManager.java:161)
COMPANY-zookeeper | 	at org.apache.zookeeper.server.ContainerManager.checkContainers(ContainerManager.java:128)
COMPANY-zookeeper | 	at org.apache.zookeeper.server.ContainerManager$1.run(ContainerManager.java:96)
COMPANY-zookeeper | 	at java.base/java.util.TimerThread.mainLoop(Unknown Source)
COMPANY-zookeeper | 	at java.base/java.util.TimerThread.run(Unknown Source)
COMPANY-zookeeper | 2021-03-09 08:01:21,322 [myid:1] - ERROR [ContainerManagerTask:ContainerManager$1@102] - Error checking containers
...