No, we don't have any means to obtain table statistics through our
public API (the collection of code which we guarantee stability on).
We have https://issues.apache.org/jira/browse/ACCUMULO-3206 open for
future work, but no one has started working on it.
Dylan's comment from that mail thread you linked to is likely to still
be functional (or very close to it) in 1.7.
peter.mar...@baesystems.com wrote:
Hi,
I was wondering if there is any “recognized” way to obtain table statistics.
Ideally, given a Key range I would like to know the number of distinct
rowids, entries and amount of data (in bytes) in that key range.
I assume that Accumulo holds at least some of this information
internally, partly because I can see some of this
through the monitor, and partly because it must know something about the
quantity of data held in order to be able
to implement the table threshold.
In my case the tables are very static and so the “estimates” that the
monitor has are likely to sufficiently accurate for my purposes.
I have found this link
http://apache-accumulo.1065345.n5.nabble.com/Determining-tablets-assigned-to-table-splits-and-the-number-of-rows-in-each-tablet-td11546.html
which describes a process (which I haven’t tried yet) to get the number
of entries in a range.
Which would probably be sufficient for me and would certainly be a good
start.
However it seems to be using internal data structures and non-published
APIs, which is less than ideal.
And it seems to be written against Accumulo version 1.6.
I’m using Accumulo 1.7. Is there anything better than I can do or is it
recommended that this is the way to go?
Regards,
Z
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