Hongchao Deng created ZOOKEEPER-2020:
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Summary: Change TRUNC to SNAP in sync phase for safety guarantee
Key: ZOOKEEPER-2020
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2020
Project: ZooKeeper
Issue Type: Sub-task
Affects Versions: 3.5.0
Reporter: Hongchao Deng
Fix For: 3.5.1
ZOOKEEPER-1549 discusses the problem:
"When the leader started, it will apply every txn in its txnlog (incl.
uncommitted ones) into its in-memory data tree"
I didn't any solution so far solved this problem in 3.5.x. Since this affects
only TRUNC part -- only old leader that needs TRUNC applies uncommitted txns, a
simple fix would be change current TRUNC logic to SNAP. This isn't hard to
implement, but guarantees safety.
Ideally, we will solve the whole problem by untangling all compatibility issues
and fixing the protocol.
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