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Posted to issues@hbase.apache.org by "Cosmin Lehene (JIRA)" <ji...@apache.org> on 2011/03/22 15:20:05 UTC
[jira] [Updated] (HBASE-3660) HMaster will exit when starting with
stale data in cached locations such as -ROOT- or .META.
[ https://issues.apache.org/jira/browse/HBASE-3660?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Cosmin Lehene updated HBASE-3660:
---------------------------------
Description:
later edit: I've mixed up two issues here. The main problem is that a client (that could be HMaster) will read stale data from -ROOT- or .META. and not deal correctly with the raised exceptions.
I've noticed this when the IP on my machine changed (it's even easier to detect when LZO doesn't work)
Master loads .META. successfully and then starts assigning regions.
However LZO doesn't work so HRegionServer can't open the regions.
A client attempts to get data from a table so it reads the location from .META. but goes to a totally different server (the old value in .META.)
This could happen without the LZO story too.
was:
I've noticed this when the IP on my machine changed (it's even easier to detect when LZO doesn't work)
Master loads .META. successfully and then starts assigning regions.
However LZO doesn't work so HRegionServer can't open the regions.
A client attempts to get data from a table so it reads the location from .META. but goes to a totally different server (the old value in .META.)
This could happen without the LZO story too.
Summary: HMaster will exit when starting with stale data in cached locations such as -ROOT- or .META. (was: If regions assignment fails, clients will be directed to stale data from .META.)
Changed the issue Summary since the problem was elsewhere.
> HMaster will exit when starting with stale data in cached locations such as -ROOT- or .META.
> --------------------------------------------------------------------------------------------
>
> Key: HBASE-3660
> URL: https://issues.apache.org/jira/browse/HBASE-3660
> Project: HBase
> Issue Type: Bug
> Components: master, regionserver
> Affects Versions: 0.90.1
> Reporter: Cosmin Lehene
> Priority: Critical
> Fix For: 0.90.2
>
> Attachments: HBASE-3660.patch
>
>
> later edit: I've mixed up two issues here. The main problem is that a client (that could be HMaster) will read stale data from -ROOT- or .META. and not deal correctly with the raised exceptions.
> I've noticed this when the IP on my machine changed (it's even easier to detect when LZO doesn't work)
> Master loads .META. successfully and then starts assigning regions.
> However LZO doesn't work so HRegionServer can't open the regions.
> A client attempts to get data from a table so it reads the location from .META. but goes to a totally different server (the old value in .META.)
> This could happen without the LZO story too.
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