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https://issues.apache.org/jira/browse/ACCUMULO-132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13147854#comment-13147854
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Keith Turner commented on ACCUMULO-132:
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For the clone table option, would want to encourage the clone tablets to be
assigned on different servers than the source tablets. Could provide an option
to the clone table command to randomly reassign tablets. Currently ti will
likely assigned cloned tablets to the same server as the source tablets.
> read-only access to existing tables for speculative execution
> -------------------------------------------------------------
>
> Key: ACCUMULO-132
> URL: https://issues.apache.org/jira/browse/ACCUMULO-132
> Project: Accumulo
> Issue Type: New Feature
> Components: client
> Affects Versions: 1.5.0
> Reporter: Eric Newton
> Assignee: Eric Newton
>
> An accumulo user has a need to perform a map/reduce over an entire table.
> Right now, if a tablet server is running on a machine that has become slow
> due to failing hardware (it happens... a lot), the mapper using that server
> also runs slowly. If we allow speculative execution, the second map just
> goes back to the same tablet server, doubling the load on our already slow
> server. However, the data behind the tablet server is sitting there in
> multiple locations in HDFS. The user can live without pulling the most
> recent updates in the tablet server's memory.
> Possible solutions:
> # provide read-only hosting of a tablet from another node, possibly on demand
> # convenient way of re-creating the tablet server iterator stack and reading
> the files directly
> # clone the table/tablet (has the benefit that a reference is maintained in
> the metadata table)
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