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https://issues.apache.org/jira/browse/HBASE-11165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14120142#comment-14120142
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Andrey Stepachev commented on HBASE-11165:
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bq.Yeah, we'll have to go this route if we are trying to keep state of a big 
cluster in heap. Could work on making the representation more compact. You 
arguing for single meta region Andrey Stepachev then? There is also the on-hdfs 
size to consider (write-amplification) and the r/w i/os.

For sure, compact representation doesn't implicate single meta. Compact meta 
allows to bother with split meta only for really big installations. But how 
HDFS would handle that, as [~mantonov] mentioned above.

As for compact META representations we can use other technics to reduce HDFS 
impact for big meta.

> Scaling so cluster can host 1M regions and beyond (50M regions?)
> ----------------------------------------------------------------
>
>                 Key: HBASE-11165
>                 URL: https://issues.apache.org/jira/browse/HBASE-11165
>             Project: HBase
>          Issue Type: Brainstorming
>            Reporter: stack
>         Attachments: HBASE-11165.zip, Region Scalability test.pdf, 
> zk_less_assignment_comparison_2.pdf
>
>
> This discussion issue comes out of "Co-locate Meta And Master HBASE-10569" 
> and comments on the doc posted there.
> A user -- our Francis Liu -- needs to be able to scale a cluster to do 1M 
> regions maybe even 50M later.  This issue is about discussing how we will do 
> that (or if not 50M on a cluster, how otherwise we can attain same end).
> More detail to follow.



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