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<pre wrap="">Subject: MMR: simultaneous total updates on the masters cause deadlock and data loss
<a class="moz-txt-link-freetext" href="https://bugzilla.redhat.com/show_bug.cgi?id=570667">https://bugzilla.redhat.com/show_bug.cgi?id=570667</a>
[Revised proposal]
--> (<a class="moz-txt-link-freetext"
href="https://bugzilla.redhat.com/attachment.cgi?id=398089">https://bugzilla.redhat.com/attachment.cgi?id=398089</a>)
git patch file
I revised the previous patch to allow sending simultaneous total updates
against other replicas. I think it's no need to disallow it.
Thank you!
--noriko
</pre>
<blockquote cite="mid:4B9065FF.7040603@redhat.com" type="cite"><br>
Description: In the MMR topology, if a master receives a total
<br>
update request to initialize the other master and being initialized
<br>
by the other master at the same time, the 2 replication threads hang
<br>
and the replicated backend instance could be wiped out.
<br>
<br>
To prevent the server running the total update supplier and the
<br>
consumer at the same time, REPLICA_TOTAL_EXCLUSIVE bit has
<br>
been introduced and set to the replica state flag by the either
<br>
operation. Once the bit is detected, the other operation fails with
<br>
the error.
<br>
<br>
Files:
<br>
ldap/servers/plugins/replication/repl5.h
<br>
ldap/servers/plugins/replication/repl5_protocol.c
<br>
ldap/servers/plugins/replication/repl_extop.c
<br>
<br>
<br>
[Fix proposal]
<br>
--> (<a class="moz-txt-link-freetext" href="https://bugzilla.redhat.com/attachment.cgi?id=397962">https://bugzilla.redhat.com/attachment.cgi?id=397962</a>)
<br>
git patch file
<br>
<br>
<br>
<pre wrap="">
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</blockquote>
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