[ZOOKEEPER-2349] Update documentation for snapCount

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 3.4.11, 3.5.4, 3.6.0
• Component/s: documentation
• Assignee: Ling Mao
• Reporter: Raghavendra Prabhu
• Created: 21/Dec/15 14:17
• Updated: 11/Sep/17 21:37
• Resolved: 11/Sep/17 20:43

Description

The documentation states that

ZooKeeper logs transactions to a transaction
log. After snapCount transactions are written to a log
file a snapshot is started and a new transaction log
file is created. The default snapCount is
100,000.

However, in implementation, snapshotting is done when logCount is somwhere in (snapCount/2, snapCount+1], based on the limit set at runtime:

        if (logCount > (snapCount / 2 + randRoll)) {

as in

https://github.com/apache/zookeeper/blob/trunk/src/java/main/org/apache/zookeeper/server/SyncRequestProcessor.java#L124

Issue Links

• links to: GitHub Pull Request #349