<div dir="ltr"><div><div><div>Ian,<br><br></div>Do you've a reproducer for this bug? If not a specific one, a general outline of what operations where done on the file will help.<br><br></div>regards,<br></div>Raghavendra<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Mar 26, 2018 at 12:55 PM, Raghavendra Gowdappa <span dir="ltr"><<a href="mailto:rgowdapp@redhat.com" target="_blank">rgowdapp@redhat.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote"><span class="">On Mon, Mar 26, 2018 at 12:40 PM, Krutika Dhananjay <span dir="ltr"><<a href="mailto:kdhananj@redhat.com" target="_blank">kdhananj@redhat.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><div>The gfid mismatch here is between the shard and its "link-to" file, the creation of which happens at a layer below that of shard translator on the stack.<br></div><div><br></div><div>Adding DHT devs to take a look.<br></div></div></div></blockquote><div><br></div></span><div>Thanks Krutika. I assume shard doesn't do any dentry operations like rename, link, unlink on the path of file (not the gfid handle based path) internally while managing shards. Can you confirm? If it does these operations, what fops does it do?<br></div><div><br></div><div>@Ian,</div><div><br></div><div>I can suggest following way to fix the problem:<br></div><div>* Since one of files listed is a DHT linkto file, I am assuming there is only one shard of the file. If not, please list out gfids of other shards and don't proceed with healing procedure.<br></div><div>* If gfids of all shards happen to be same and only linkto has a different gfid, please proceed to step 3. Otherwise abort the healing procedure.</div><div>* If cluster.lookup-optimize is set to true abort the healing procedure</div><div>* Delete the linkto file - the file with permissions -------T and xattr trusted.dht.linkto and do a lookup on the file from mount point after turning off readdriplus [1].</div><div><br></div><div>As to reasons on how we ended up in this situation, Can you explain me what is the I/O pattern on this file - like are there lots of entry operations like rename, link, unlink etc on the file? There have been known races in rename/lookup-heal-creating-<wbr>linkto where linkto and data file have different gfids. [2] fixes some of these cases<br></div><div><br></div><div>[1] <a href="http://lists.gluster.org/pipermail/gluster-users/2017-March/030148.html" target="_blank">http://lists.gluster.org/<wbr>pipermail/gluster-users/2017-<wbr>March/030148.html</a></div><div>[2] <a href="https://review.gluster.org/#/c/19547/" target="_blank">https://review.gluster.org/#/<wbr>c/19547/</a><br></div><div><br></div><div>regards,</div><div>Raghavendra<br></div><div><div class="h5"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br></blockquote></div>-Krutika<br></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="m_-2217322752226999361gmail-h5">On Mon, Mar 26, 2018 at 1:09 AM, Ian Halliday <span dir="ltr"><<a href="mailto:ihalliday@ndevix.com" target="_blank">ihalliday@ndevix.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div class="m_-2217322752226999361gmail-h5">
<div><div>Hello all,</div><div><br></div><div>We are having a rather interesting problem with one of our VM storage systems. The GlusterFS client is throwing errors relating to GFID mismatches. We traced this down to multiple shards being present on the gluster nodes, with different gfids.</div><div><br></div><div>Hypervisor gluster mount log:</div><div><br></div><div>[2018-03-25 18:54:19.261733] E [MSGID: 133010] [shard.c:1724:shard_common_loo<wbr>kup_shards_cbk] 0-ovirt-zone1-shard: Lookup on shard 7 failed. Base file gfid = 87137cac-49eb-492a-8f33-8e3347<wbr>0d8cb7 [Stale file handle]</div><div>The message "W [MSGID: 109009] [dht-common.c:2162:dht_lookup_<wbr>linkfile_cbk] 0-ovirt-zone1-dht: /.shard/87137cac-49eb-492a-8f3<wbr>3-8e33470d8cb7.7: gfid different on data file on ovirt-zone1-replicate-3, gfid local = 00000000-0000-0000-0000-000000<wbr>000000, gfid node = 57c6fcdf-52bb-4f7a-aea4-02f0dc<wbr>81ff56 " repeated 2 times between [2018-03-25 18:54:19.253748] and [2018-03-25 18:54:19.263576]</div><div>[2018-03-25 18:54:19.264349] W [MSGID: 109009] [dht-common.c:1901:dht_lookup_<wbr>everywhere_cbk] 0-ovirt-zone1-dht: /.shard/87137cac-49eb-492a-8f3<wbr>3-8e33470d8cb7.7: gfid differs on subvolume ovirt-zone1-replicate-3, gfid local = fdf0813b-718a-4616-a51b-6999eb<wbr>ba9ec3, gfid node = 57c6fcdf-52bb-4f7a-aea4-02f0dc<wbr>81ff56</div><div><br></div><div><br></div><div>On the storage nodes, we found this:</div><div><br></div><div>[root@n1 gluster]# find -name 87137cac-49eb-492a-8f33-8e3347<wbr>0d8cb7.7</div><div>./brick2/brick/.shard/87137cac<wbr>-49eb-492a-8f33-8e33470d8cb7.7</div><div>./brick4/brick/.shard/87137cac<wbr>-49eb-492a-8f33-8e33470d8cb7.7</div><div><br></div><div>[root@n1 gluster]# ls -lh ./brick2/brick/.shard/87137cac<wbr>-49eb-492a-8f33-8e33470d8cb7.7</div><div>---------T. 2 root root 0 Mar 25 13:55 ./brick2/brick/.shard/87137cac<wbr>-49eb-492a-8f33-8e33470d8cb7.7</div><div>[root@n1 gluster]# ls -lh ./brick4/brick/.shard/87137cac<wbr>-49eb-492a-8f33-8e33470d8cb7.7</div><div>-rw-rw----. 2 root root 3.8G Mar 25 13:55 ./brick4/brick/.shard/87137cac<wbr>-49eb-492a-8f33-8e33470d8cb7.7</div>
<div><br></div><div id="m_-2217322752226999361gmail-m_-7008808090284224248m_4796567358248921674signature_old"><div id="m_-2217322752226999361gmail-m_-7008808090284224248m_4796567358248921674x64746296573c472"><div>[root@n1 gluster]# getfattr -d -m . -e hex ./brick2/brick/.shard/87137cac<wbr>-49eb-492a-8f33-8e33470d8cb7.7</div><div># file: brick2/brick/.shard/87137cac-4<wbr>9eb-492a-8f33-8e33470d8cb7.7</div><div>security.selinux=0x73797374656<wbr>d5f753a6f626a6563745f723a756e6<wbr>c6162656c65645f743a733000</div><div>trusted.gfid=0xfdf0813b718a461<wbr>6a51b6999ebba9ec3</div><div>trusted.glusterfs.dht.linkto=0<wbr>x6f766972742d3335302d7a6f6e653<wbr>12d7265706c69636174652d3300</div><div><br></div><div>[root@n1 gluster]# getfattr -d -m . -e hex ./brick4/brick/.shard/87137cac<wbr>-49eb-492a-8f33-8e33470d8cb7.7</div><div># file: brick4/brick/.shard/87137cac-4<wbr>9eb-492a-8f33-8e33470d8cb7.7</div><div>security.selinux=0x73797374656<wbr>d5f753a6f626a6563745f723a756e6<wbr>c6162656c65645f743a733000</div><div>trusted.afr.dirty=0x0000000000<wbr>00000000000000</div><div>trusted.bit-rot.version=0x0200<wbr>00000000000059914190000ce672</div><div>trusted.gfid=0x57c6fcdf52bb4f7<wbr>aaea402f0dc81ff56</div><div><br></div><div><br></div><div>I'm wondering how they got created in the first place, and if anyone has any insight on how to fix it?</div><div><br></div><div>Storage nodes:</div><div>[root@n1 gluster]# gluster --version</div><div>glusterfs 4.0.0</div><div><br></div><div>[root@n1 gluster]# gluster volume info</div><div><br></div><div>Volume Name: ovirt-350-zone1</div><div>Type: Distributed-Replicate</div><div>Volume ID: 106738ed-9951-4270-822e-63c9bc<wbr>d0a20e</div><div>Status: Started</div><div>Snapshot Count: 0</div><div>Number of Bricks: 7 x (2 + 1) = 21</div><div>Transport-type: tcp</div><div>Bricks:</div><div>Brick1: 10.0.6.100:/gluster/brick1/bri<wbr>ck</div><div>Brick2: 10.0.6.101:/gluster/brick1/bri<wbr>ck</div><div>Brick3: 10.0.6.102:/gluster/arbrick1/b<wbr>rick (arbiter)</div><div>Brick4: 10.0.6.100:/gluster/brick2/bri<wbr>ck</div><div>Brick5: 10.0.6.101:/gluster/brick2/bri<wbr>ck</div><div>Brick6: 10.0.6.102:/gluster/arbrick2/b<wbr>rick (arbiter)</div><div>Brick7: 10.0.6.100:/gluster/brick3/bri<wbr>ck</div><div>Brick8: 10.0.6.101:/gluster/brick3/bri<wbr>ck</div><div>Brick9: 10.0.6.102:/gluster/arbrick3/b<wbr>rick (arbiter)</div><div>Brick10: 10.0.6.100:/gluster/brick4/bri<wbr>ck</div><div>Brick11: 10.0.6.101:/gluster/brick4/bri<wbr>ck</div><div>Brick12: 10.0.6.102:/gluster/arbrick4/b<wbr>rick (arbiter)</div><div>Brick13: 10.0.6.100:/gluster/brick5/bri<wbr>ck</div><div>Brick14: 10.0.6.101:/gluster/brick5/bri<wbr>ck</div><div>Brick15: 10.0.6.102:/gluster/arbrick5/b<wbr>rick (arbiter)</div><div>Brick16: 10.0.6.100:/gluster/brick6/bri<wbr>ck</div><div>Brick17: 10.0.6.101:/gluster/brick6/bri<wbr>ck</div><div>Brick18: 10.0.6.102:/gluster/arbrick6/b<wbr>rick (arbiter)</div><div>Brick19: 10.0.6.100:/gluster/brick7/bri<wbr>ck</div><div>Brick20: 10.0.6.101:/gluster/brick7/bri<wbr>ck</div><div>Brick21: 10.0.6.102:/gluster/arbrick7/b<wbr>rick (arbiter)</div><div>Options Reconfigured:</div><div>cluster.min-free-disk: 50GB</div><div>performance.strict-write-order<wbr>ing: off</div><div>performance.strict-o-direct: off</div><div>nfs.disable: off</div><div>performance.readdir-ahead: on</div><div>transport.address-family: inet</div><div>performance.cache-size: 1GB</div><div>features.shard: on</div><div>features.shard-block-size: 5GB</div><div>server.event-threads: 8</div><div>server.outstanding-rpc-limit: 128</div><div>storage.owner-uid: 36</div><div>storage.owner-gid: 36</div><div>performance.quick-read: off</div><div>performance.read-ahead: off</div><div>performance.io-cache: off</div><div>performance.stat-prefetch: on</div><div>cluster.eager-lock: enable</div><div>network.remote-dio: enable</div><div>cluster.quorum-type: auto</div><div>cluster.server-quorum-type: server</div><div>cluster.data-self-heal-algorit<wbr>hm: full</div><div>performance.flush-behind: off</div><div>performance.write-behind-windo<wbr>w-size: 8MB</div><div>client.event-threads: 8</div><div>server.allow-insecure: on</div><div><br></div><div><br></div><div>Client version: </div><div>[root@kvm573 ~]# gluster --version</div><div>glusterfs 3.12.5</div><div><br></div><div><br></div><div>Thanks!</div><span class="m_-2217322752226999361gmail-m_-7008808090284224248HOEnZb"><font color="#888888"><div><br></div>- Ian</font></span></div></div><div><br></div>
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