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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1357) If one sets the hbase.master to non local regionservers can't find the master
Date Fri, 22 May 2009 14:34:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12712111#action_12712111

Jean-Daniel Cryans commented on HBASE-1357:

Ok let's do it like that. One thing that we should do tho is to have a more detailed "How
to run distributed mode" documentation.

> If one sets the hbase.master to non local regionservers can't find the master
> -------------------------------------------------------------------------------------
>                 Key: HBASE-1357
>                 URL: https://issues.apache.org/jira/browse/HBASE-1357
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: master, regionserver
>    Affects Versions: 0.20.0, 0.20.1, 0.21.0
>         Environment: All
>            Reporter: Alex Newman
>            Assignee: Nitay Joffe
>             Fix For: 0.20.0
> (2:11:20 PM) posix4e: so i want to run a back master on each node
> (2:11:29 PM) posix4e: and i have my hbase.master set to
> (2:14:59 PM) posix4e: each master only gets the local regionserver connecting
> (2:15:08 PM) posix4e: as it must be using that variable to know what to connect to
> (2:15:32 PM) nitay: the RS don't use hbase.master* anymore
> (2:15:36 PM) nitay: ohhh i think i know th eproblem
> (2:15:44 PM) nitay: so the RS use ZK to get the master address
> (2:15:49 PM) nitay: but the masters are writing to it
> (2:15:58 PM) nitay: b/c they write whatever was in their conf
> (2:16:20 PM) posix4e: yea
> (2:16:42 PM) nitay: can u do a zookeeper dump of that node to verify my thinking?
> (2:16:55 PM) posix4e: yea
> (2:17:12 PM) nitay: it should be /hbase/master, unless u've changed the defaults
> (2:17:59 PM) nitay: hmm s o ye this is a problem, we solved this in RS (allowing
by having master actually write RS's address to ZK when it gets contacted
> (2:18:21 PM) nitay: so now we need to find a way to find out the _actual_ address the
master has bound to
> (2:19:47 PM) posix4e: is their a way to do that?
> (2:20:16 PM) nitay: i dont know, good question
> (2:20:18 PM) posix4e: or does it require code changes i.e. regionserver checking zk
> (2:20:27 PM) nitay: did u verify the master address?
> (2:20:48 PM) posix4e: one sec
> (2:21:03 PM) nitay: its almost like we want ZK to be able to tell us what address we're
using to talk to it
> (2:21:20 PM) nitay: that assumes u dont have different NICs to talk to ZK vs. HBase
> (2:21:59 PM) nitay: posix4e, u can't really use the RS as far as i can tell b/c the RS
knows nothing about the master until the master address appears in ZK
> (2:22:25 PM) posix4e: 0:0:0:0:0:0:0:0:60000
> (2:22:40 PM) nitay: yep that's the magic
> (2:22:45 PM) nitay: k thx for verifying
> (2:22:54 PM) nitay: u want to open up a JIRA?
> (2:22:57 PM) posix4e: but if i could tell hbase.site to just use my hostname:port it
would work ok
> (2:22:58 PM) posix4e: yea
> (2:23:09 PM) posix4e: can i quote this conversation?
> (2:23:18 PM) nitay: yes please do
> (2:23:45 PM) nitay: also, to fix this here and now for u, u'd essentially need to actually
set hbase.master* to the ip/host u're using
> (2:23:55 PM) nitay: and change it on each backup master to that guy's host/ip
> (2:24:02 PM) nitay: i know, its a royal PITA
> (2:24:59 PM) posix4e: yea
> (2:25:03 PM) posix4e: no problem
> (2:25:20 PM) nitay: but that should work till we find a better solution
> (2:25:21 PM) posix4e: I am trying to think how a patch would work
> (2:25:25 PM) posix4e: have a masters file?
> (2:25:44 PM) nitay: yeah if u have any ideas please offer them
> (2:25:46 PM) nitay: hmm interesting idea
> (2:26:16 PM) nitay: and then do some local gethostbyname() type thing checking against
masters file?
> (2:26:26 PM) posix4e: yea
> (2:28:23 PM) nitay: one thing to note is we've talked about eventually getting to a place
where any RS can be master
> (2:28:30 PM) nitay: but i like your idea
> (2:28:37 PM) nitay: post it on the JIRA
> (2:30:24 PM) nitay: i gotta run, thanks for the info posix4e - very helpful, its great
to hear from people actually using this stuff
> (2:32:56 PM) posix4e: yep
> I also solved this by manually setting the hbase.master  on each host to point to the
local hostname, which sucks.

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