One example is below. Please note that these settings are static ones, user need to restart Zookeeper to make them take effect. New in 3.4.0: When enabled, ZooKeeper auto purge feature retains the autopurge.snapRetainCount most recent snapshots and the corresponding transaction logs in the dataDir and dataLogDir respectively and deletes the rest. The default value is 64MB, we can set it to 1MB. preAllocSize: The setting limits the block size of each Zookeeper transaction log.You should be aware of this dependency then, and take great care if you want to ensure that ZooKeeper operations aren’t held up by your media. In that case the zookeeper. We can reduce the size to smaller value, such as half – 50000. ZooKeeper has strong durability guarantees, which means it uses storage media to log changes before the operation responsible for the change is allowed to complete. I am assuming you are running the embedded zookeeper here. By default, the Zookeeper transaction log switch will happen after “snapCount(100000)” transaction happens. Further, the zookeeper properties - 'autopurge.snapRetainCount' and 'autopurge.purgeInterval' have to be tuned according to the required retention count and the frequency to limit the increasing number of transaction log and snapshot files. snapCount: This setting controls the number of transactions in one Zookeeper transaction log.There are two settings to limit the zookeeper transaction log size:
Set to a positive integer (1 and above) to enable the auto purging. QuorumPeerConfig) 07:43:12,241 INFO autopurge.snapRetainCount set to 3 (.DatadirCleanupManager). Configure the time interval in hours for the purge task by setting the value of the topurge. The time interval in hours for which the purge task has to be triggered. The default value is 4, and the minimum value is 3. When enabled, ZooKeeper auto purge feature retains the autopurge.snapRetainCount most recent snapshots and the corresponding transaction logs in the dataDir and dataLogDir respectively and deletes the rest.
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