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https://issues.apache.org/jira/browse/ZOOKEEPER-2574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15679478#comment-15679478
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ASF GitHub Bot commented on ZOOKEEPER-2574:
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GitHub user abhishekrai opened a pull request:
https://github.com/apache/zookeeper/pull/111
ZOOKEEPER-2574: PurgeTxnLog can inadvertently delete required txn log files
… files
This fix includes patch from Ed Rowe for ZOOKEEPER-2420, which is the same
issue as ZOOKEEPER-2574.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/abhishekrai/zookeeper ZOOKEEPER-2574
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/zookeeper/pull/111.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #111
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commit 4bc4a77800c25ab5bcdaf1149c28b1912d29064f
Author: Abhishek Rai <abhis...@thoughtspot.com>
Date: 2016-11-18T18:42:51Z
ZOOKEEPER-2574: PurgeTxnLog can inadvertently delete required txn log files
This fix includes patch from Ed Rowe for ZOOKEEPER-2420, which is the same
issue as ZOOKEEPER-2574.
----
> PurgeTxnLog can inadvertently delete required txn log files
> -----------------------------------------------------------
>
> Key: ZOOKEEPER-2574
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2574
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.4.7, 3.4.8, 3.5.0, 3.5.1, 3.5.2
> Environment: Zookeeper 3.4.8, standalone, and 3-server quorum
> Reporter: Abhishek Rai
> Assignee: Abhishek Rai
> Fix For: 3.4.10, 3.5.3
>
> Attachments: ZOOKEEPER-2574.2.patch, ZOOKEEPER-2574.3.patch,
> ZOOKEEPER-2574.4.patch, ZOOKEEPER-2574.5.patch, ZOOKEEPER-2574.6.patch,
> ZOOKEEPER-2574.patch
>
>
> As part of the fix for ZOOKEEPER-1797, the call to
> FileTxnSnapLog.getSnapshotLogs() was removed from PurgeTxnLog.java. As a
> result, some old-looking but required txn log files can be deleted, resulting
> in data corruption or loss.
> For example, consider the following:
> 1. Configuration:
> autopurge.snapRetainCount=3
> 2. Following files exist:
> log.100 spans transactions from zxid=100 till zxid=140 (inclusive)
> snapshot.110 - snapshot as of zxid=110
> snapshot.120 - snapshot as of zxid=120
> snapshot.130 - snapshot as of zxid=130
> Above scenario is possible when snapshotting has happened multiple times but
> without accompanying log rollover, which is possible if the server was
> running as a learner.
> 3. PurgeTxnLog retains all snapshots but deletes log.100 because its zxid is
> older than the zxid of the oldest snapshot (110). This results in loss of
> transactions in the range 131-140.
> Before the fix for ZOOKEEPER-1797, this was avoided by the call to
> FileTxnSnapLog.getSnapshotLogs() which finds and retains the newest txn log
> file with starting zxid < oldest retained snapshot's highest zxid.
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