Perl 6 - the future is here, just unevenly distributed

IRC log for #gluster, 2016-11-22

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02:48 Topic for #gluster is now Gluster Community - http://gluster.org | Documentation - https://gluster.readthedocs.io/en/latest/ | Patches - http://review.gluster.org/ | Developers go to #gluster-dev | Channel Logs - https://botbot.me/freenode/gluster/ & http://irclog.perlgeek.de/gluster/
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10:53 nocs hello!
10:53 glusterbot nocs: Despite the fact that friendly greetings are nice, please ask your question. Carefully identify your problem in such a way that when a volunteer has a few minutes, they can offer you a potential solution. These are volunteers, so be patient. Answers may come in a few minutes, or may take hours. If you're still in the channel, someone will eventually offer an answer.
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11:01 nocs Is it possible read and write from a specific brick? My main problem is read and write locally but replicated on many servers.
11:01 nocs I just created a volume with 3 servers in replica.
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11:06 abyss^ nocs: try this: https://joejulian.name/blog/glusterfs-split-brain-recovery-made-easy/
11:06 glusterbot Title: GlusterFS Split-Brain Recovery Made Easy (at joejulian.name)
11:07 abyss^ but generally you should read and write only from gluster client (with mean all the bricks)
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11:27 nocs abyss^, how it works this script? I want guarantee replicated write while read from local file system without passing through mount glusterfs client. My aim is improve performance specially in read and possibly in write
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11:29 abyss^ nocs: works only via client side
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11:31 abyss^ nocs: but to read from bricks would be rather hard - how you will know where that writing file will be lie on which brick?
11:32 abyss^ to improve perfromance you should rather use different form of replication intead of reading from brick
11:38 MadPsy Is anybody aware of what might cause PHP running 'rm' on an NFS Gluster share to return before the operation is completed? Seeing a problem whereby exec(rm..) is returning but the directory is still there when the next functions get called
11:38 nocs abyss^ what kind of replica can i use to guarantee data synch during writing and high performance while reading?
11:40 cloph why exec? and rm won't delete directories, just files, rmdir is used to delete directories.
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11:58 MadPsy cloph, that's just the way it is.. not my code
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12:19 abyss^ nocs: To answer to that question you have to wait for more experienced users of glusterfs :)
12:20 nocs abyss^ thanks in advance! I'm waiting...
12:21 abyss^ yeah, I suppose within 4 hours someone  should be here and be able to answer for your question.
12:22 kkeithley is the command just `rm $somepath`  or is it `rm -rf $somepath` ?
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12:27 MadPsy kkeithley, that for me?
12:27 kkeithley yp
12:27 kkeithley yep
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12:28 MadPsy https://paste.fedoraproject.org/488421/17711147/
12:28 glusterbot Title: #488421 • Fedora Project Pastebin (at paste.fedoraproject.org)
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12:29 kkeithley yeah, so `rm -rf ...` does (or should) delete directories
12:29 kkeithley contrary to the comment above that says you need to use rmdir
12:29 MadPsy it works 99.9% of the time but sometimes it's as if the 'rm' hasn't completed before the rename happens
12:29 kkeithley #justsayin'
12:30 MadPsy indeed :)
12:30 MadPsy doesn't seem to happen with local disks but on gluster I've now seen it > once, which is an issue
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12:58 cloph (still bad code though, doesn't check return value and no quoting - you should at least stick an excapeshellarg(<assembledpath>) in there...)
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18:02 nocs hello everyone, i have 3 nodes glusterfs in which there are 1 Brick each. In each node we mount the local brick if we mount the local brick why have a very slow read?
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18:08 cloph you don't mount a brick, you mount the volume, and the node you specify is for retrieving the volume information and then it uses all nodes. (when using the fuse mount)
18:16 nocs if i mount with a local node over nfs (so bypass fuse mount) we have the direct access on the local brick?
18:20 Telsin nocs: no, and you don't want to do that. you'd be accessing the brick underneath gluster, and breaking things. And you wouldn't see everything if it's a dispersed volume
18:20 Telsin nocs: mount the gluster volume, and it should do local reads if it can
18:23 nocs is it impossible read local brick?
18:28 Telsin no, but you probably don't want to
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20:05 bartden Hi, i have an issue with a MD5 hash calculated on a file (which is part of a brick) accessed via the local filesystem (not via glusterd). The md5 changes when i stop the glusterd
20:05 bartden the brick is located on a luks encrypted block device
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20:22 nocs Telsin how to read the local brick?
20:23 Telsin nocs: it's just a local file system hierarchy, unless your volume is distributed or dispersed (or you're using sharding)
20:24 Telsin if any of those apply, you won't see your whole files on any one brick
20:25 Telsin bartden: since I'm on a similar subject, why are you accessing it via the local file system? if that volume is replicated/etc, gluster is  probably "repairing" the local file for you, since it will think it's broken
20:25 nocs Telsin in replica mode, the read performance are very poor in all the nodes except the first brick
20:26 bartden So Telsin do you mean that when i copy it via a node which has a glusterfs mount to the brick, it should be consistent?
20:28 Telsin yeah, you should be accessing it via a mountpoint of the gluster volume
20:28 Telsin nocs: small files?
20:28 nocs yes, like php files
20:29 nocs we have many php-fpm servers which mounted the volume glusterfs
20:29 Telsin kind of a known issue. using a recent version in whatever major you're on?
20:30 Telsin I'd recommend searching the mailing list for "small file performance", there's a few things you can tweak. nfs mounts (of the gluster volume) may be faster than gluster fuse mounts for that, too
20:31 nocs if i mount the local node over NFS i will access directly to the local brick?
20:32 Telsin configurable, but it's known to handle smaller file reads better (at least in the past…)
20:35 cloph https://joejulian.name/blog/dht-misses-are-expensive/
20:35 glusterbot Title: DHT misses are expensive (at joejulian.name)
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