Bug 1321124 – Replication changelog can incorrectly skip over updates

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Bug 1321124 - Replication changelog can incorrectly skip over updates

Summary:	Replication changelog can incorrectly skip over updates

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	389-ds-base (Show other bugs)
Sub Component:
Version:	7.3
Hardware:	All Linux

Priority	urgent Severity urgent
Target Milestone:	rc
Target Release:	---
Assigned To:	mreynolds
QA Contact:	Viktor Ashirov
Docs Contact:	Petr Bokoc

URL:
Whiteboard:
Keywords:	ZStream

Depends On:
Blocks:	1350707
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Reported:	2016-03-24 13:48 EDT by Noriko Hosoi
Modified:	2016-11-03 16:40 EDT (History)
CC List:	16 users (show)

See Also:
Fixed In Version:	389-ds-base-1.3.5.10-11.el7
Doc Type:	Bug Fix
Doc Text:	Replication changelog no longer incorrectly skips updates A bug in the changelog iterator buffer caused it to point to an incorrect position when reloading the buffer. This caused replication to skip parts of the changelog, and consequently some changes were not replicated. This bug has been fixed, and replication data loss due to an incorrectly reloaded changelog buffer no longer occurs.
Story Points:	---
Clone Of:
Clones:	1350707 (view as bug list)
Environment:
Last Closed:	2016-11-03 16:40:55 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Flags:	msauton: needinfo+

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2016:2594	normal	SHIPPED_LIVE	Moderate: 389-ds-base security, bug fix, and enhancement update	2016-11-03 08:11:08 EDT

Groups: None (edit)

Description Noriko Hosoi 2016-03-24 13:48:19 EDT

This bug is created as a clone of upstream ticket:
https://fedorahosted.org/389/ticket/48766

In a MMR environment where all the masters are under heavy load the replication changelog cache/buffer mechanism does not always use the correct anchor csn and some updates are not sent to the consumer.  

Typically it's the very first "bulk load" read from the changelog at the start of a replication session that has issues, but it can also happen during subsequent bulk loads during the same session.

Comment 1 Noriko Hosoi 2016-03-31 13:05:22 EDT

Justification: This bug is severe because it could cause data loss on some random replication consumer servers without being noticed.

Comment 35 errata-xmlrpc 2016-11-03 16:40:55 EDT

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2016-2594.html

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