What are the methods of tuning performance of Zookeeper on CentOS

Zookeeper performance tuning on CentOS can start from multiple aspects, including hardware configuration, operating system optimization, configuration parameter adjustment, monitoring and maintenance, etc. Here are some specific tuning methods:

Hardware configuration suggestions

• Using SSD Hard Disk : Because Zookeeper's data is written to disk, it is highly recommended to use SSD for improved I/O performance.
• Enough memory : Allocate enough memory resources to Zookeeper to avoid frequent disk read and write.
• Multi-core CPU : Use multi-core CPU to ensure that Zookeeper can process requests in parallel.

Operating system optimization

• Turn off swap partition : Reduce the use of swap partitions through kernel parameter adjustments and avoid frequent memory and disk space exchange.
• Increase file descriptor upper limit : avoid reducing the efficiency and effectiveness of job processing due to tight system resources.

Zookeeper configuration parameter optimization

• tickTime : Set the appropriate heartbeat interval, which determines the basic unit of heartbeat and timeout. It is recommended to set it to 2000 milliseconds.
• initLimit and syncLimit : Adjust these two parameters to ensure that the synchronization and initialization time between Leader and Follower is sufficient but not long.
• maxClientCnxns : Limit the maximum number of connections per client to prevent a single client from consuming too much resources.
• autopurge.snapRetainCount and autopurge.purgeInterval : Enable automatic cleaning function to delete old snapshots and transaction logs regularly.
• dataDir and dataLogDir : store snapshot files and transaction logs respectively. It is recommended to store them separately and mount them on a separate disk.

JVM parameter optimization

• Adjust the JVM heap memory size : Make sure Zookeeper has enough memory to handle requests, use a suitable garbage collector such as G1 GC, and configure garbage collector parameters to reduce GC pause time.

Monitoring and maintenance

• Use four-word command monitoring : Monitor the status and performance metrics of the Zookeeper service through the four-word commands provided by ZooKeeper (such as mntr, cons, crst, etc.).
• Log Management : Configure log scrolling and cleaning policies to ensure that log files are not too large and can clean old log files regularly.

Through the above optimization measures, the performance and stability of Zookeeper can be significantly improved. It should be noted that the specific configuration parameters may need to be adjusted according to the actual cluster size, network environment and performance requirements.

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