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<p class="MsoNormal"><span style="color:#1F497D">I have encountered this traceback b</span><span lang="EN-GB" style="color:#1F497D">ut I was doing something unusual: I was blowing away an existing swift system and rebuilding it with a smaller ring power. Unfortunately
I had not cleaned up all of the old data on one of the devices. On the reconfigured system the object replicator encountered partitions on that uncleaned device, in the /srv/node/<device>/objects directory, from the old configuration and so some of the partitions
encountered in that directory were greater than expected with the newer/smaller ring. As a result the object-replicator could not translate the larger partition to a device id and blew up (producing the backtrace).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="color:#1F497D">Gerry.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> McCabe, Donagh
<br>
<b>Sent:</b> 27 September 2013 15:09<br>
<b>To:</b> Mike Preston; openstack@lists.openstack.org<br>
<b>Subject:</b> Re: [Openstack] Replication error<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Mike,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Did you at some stage remove a node from your system and decommission it? We’ve seen similar (but not identical) backtraces in the replicator when someone powers up an old node.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">It’s a good idea to wipe the rings off nodes that you are removing from the system (after rebalance has finished of course).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Donagh<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Mike Preston [mailto:mike.preston@synety.com]
<br>
<b>Sent:</b> 23 September 2013 10:35<br>
<b>To:</b> openstack@lists.openstack.org<br>
<b>Subject:</b> [Openstack] Replication error<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB">Hi, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">We are seeing a replication error on swift. The error only is seen on a single node, the other nodes appear to be working fine.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-GB">Installed version is debian wheezy with swift 1.4.8-2+deb7u1
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Sep 23 10:33:03 storage-node-01 object-replicator Starting object replication pass.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Sep 23 10:33:03 storage-node-01 object-replicator Exception in top-level replication loop: #012Traceback (most recent call last):#012 File "/usr/lib/python2.7/dist-packages/swift/obj/replicator.py", line 564, in replicate#012
jobs = self.collect_jobs()#012 File "/usr/lib/python2.7/dist-packages/swift/obj/replicator.py", line 536, in collect_jobs#012 self.object_ring.get_part_nodes(int(partition))#012 File "/usr/lib/python2.7/dist-packages/swift/common/ring/ring.py", line 103,
in get_part_nodes#012 return [self.devs[r[part]] for r in self._replica2part2dev_id]#012IndexError: array index out of range<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Sep 23 10:33:03 storage-node-01 object-replicator Nothing replicated for 0.728466033936 seconds.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-GB">Sep 23 10:33:03 storage-node-01 object-replicator Object replication complete. (0.01 minutes)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Can anyone shed any light on this or next steps in debugging it or fixing it?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-GB">Mike Preston<o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-GB">Infrastructure Team | SYNETY<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><a href="http://www.synety.com">www.synety.com</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">direct: 0116 424 4016<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">mobile: 07950 892038<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">main: 0116 424 4000<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
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