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https://issues.apache.org/jira/browse/HBASE-1044?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack resolved HBASE-1044.
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Resolution: Invalid
I reviewed datanode and namenode configurations. It heartbeats every 3
seconds. Retries 3 times. Doesn't have notion of shutting down if doesn't
connect to master as we do.
Closing as invalid. When ZK is in the mix, I think we'll be less fragile.
> Make hbase less of a fainting lily when running beside a hogging tasktracker
> ----------------------------------------------------------------------------
>
> Key: HBASE-1044
> URL: https://issues.apache.org/jira/browse/HBASE-1044
> Project: Hadoop HBase
> Issue Type: Bug
> Reporter: stack
> Assignee: stack
> Fix For: 0.19.0
>
>
> From IRC (with some improving text added -- finishes on a good point made by
> jgray):
> {code}
> 18:53 < St^Ack> The coupling in a MR cluster is looser than it is in hbase
> cluster
> 18:53 < St^Ack> TTs only need report in every ten minutes and a task can fail
> and be restarted
> 18:54 < St^Ack> Whereas with hbase, it must report in at least every two
> minutes (IIRC) and cannot 'redo' lost edit -- no chance of a redo
> 18:54 < St^Ack> So, your MR job can be rougher about getting to the finish
> line; messier.
> 18:55 < tim_s> yeah.
> 18:55 < St^Ack> If MR is running on same nodes as those hosting hbase, then
> it can rob resources from hbase in a way that damages hbase but not TT
> 18:56 < St^Ack> So, maybe we need to look at the hbase config; make it more
> tolerant when its running beside a hogging TT job
> 18:57 < tim_s> hmm, that would be lovely
> 18:57 < St^Ack> Need to look at HDFS; see how 'fragile' it is too; hbase
> should be at least that 'fragile'
> 18:57 < jgray> yeah, most issues we see come from resource issues on shared
> hdfs/tt/rs nodes
> 18:57 < tim_s> so is it common to host hbase elsewhere?
> 18:57 < St^Ack> Let me make an issue on it because this is common failure
> case for hbase (Setup hbase then run your old MR job as though nothing has
> changed -- then surprise when the little hbase lady faints)
> 18:57 < jgray> tim_s: currently, no. common practice is shared
> 18:58 < St^Ack> ... and its better if shared -- locality benefits
> 18:58 < tim_s> would that be a good idea though? cause I don't really need to
> have hadoop local I guess.
> 18:58 < tim_s> ahh
> 18:58 < apurtell> we share also
> ...
> 18:59 < jgray> beyond locality, sharing makes sense as hdfs and hbase nodes
> have different requirements... hdfs being heaviest on io (where hbase has no
> use), hbase heavy in memory, TTs vary greatly but most often heavy in cpu/io
> {code}
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