Grokbase Groups HBase dev June 2011
FAQ
Hi,

While doing lots of reads I took a look at the requests coming into region
servers (from webui)
It looks like there are lot of requests (some times 10x or more) for server
which is hosting .META. compared to other servers.
This is pure read test, so there are no modifications to .META. region
info.
I would assume client would have cached .META. once and never go back unless
there is cache miss via region not exists on a server.
Trying to find out how region information is cached, shows me that it is
based on tablename and connection? (I might be wrong here)
This information could be common for all connections, right? I will try to
enable debugging and get more information.
Is this something to do with the way connection's are handled in 0.90.2 (and
will improve as part of 3777).

--
Have a Nice Day!
Lohit

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  • Stack at Jun 8, 2011 at 7:30 pm

    On Wed, Jun 8, 2011 at 12:20 PM, lohit wrote:
    Is this something to do with the way connection's are handled in 0.90.2 (and
    will improve as part of 3777).
    Your client is YCSB? This should be keeping around its connections
    (3777 shouldn't make a difference here).
    St.Ack
  • Lohit at Jun 8, 2011 at 10:11 pm
    2011/6/8 Stack <stack@duboce.net>
    On Wed, Jun 8, 2011 at 12:20 PM, lohit wrote:
    Is this something to do with the way connection's are handled in 0.90.2 (and
    will improve as part of 3777).
    Your client is YCSB? This should be keeping around its connections
    (3777 shouldn't make a difference here).
    Yes my client is YCSB, 20 threads doing reads. Once tests starts, it should
    never go back to .META.
    Not sure why the server with .META. is getting so many requests. Will update
    with more findings.
    St.Ack


    --
    Have a Nice Day!
    Lohit

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categorieshbase, hadoop
postedJun 8, '11 at 7:20p
activeJun 8, '11 at 10:11p
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