Thawan Kooburat created ZOOKEEPER-1573:
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Summary: Unable to load database due to missing parent node
Key: ZOOKEEPER-1573
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1573
Project: ZooKeeper
Issue Type: Bug
Components: server
Affects Versions: 3.4.3
Reporter: Thawan Kooburat
While replaying txnlog on data tree, the server has a code to detect missing
parent node. This code block was last modified as part of ZOOKEEPER-1333. In
our production, we found a case where this check is return false positive.
The sequence of txns is as follows:
zxid 1: create /prefix/a
zxid 2: create /prefix/a/b
zxid 3: delete /prefix/a/b
zxid 4: delete /prefix/a
The server start capturing snapshot at zxid 1. However, by the time it
traversing the data tree down to /prefix, txn 4 is already applied and /prefix
have no children.
When the server restore from snapshot, it process txnlog starting from zxid 2.
This txn generate missing parent error and the server refuse to start up.
The same check allow me to discover bug in ZOOKEEPER-1551, but I don't know if
we have any option beside removing this check to solve this issue.
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