Log truncation truncating log too much - can cause data loss
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Key: ZOOKEEPER-1156
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1156
Project: ZooKeeper
Issue Type: Bug
Components: quorum, server
Affects Versions: 3.3.3
Reporter: Vishal Kathuria
Priority: Blocker
Fix For: 3.3.4
The log truncation relies on position calculation for a particular zxid to
figure out the new size of the log file. There is a bug in PositionInputStream
implementation which skips counting the bytes in the log which have value 0.
This can lead to underestimating the actual log size. The log records which
should be there can get truncated, leading to data loss on the participant
which is executing the trunc.
Clients can see different values depending on whether they connect to the node
on which trunc was executed.
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