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HBase >> mail # user >> independent scans to same region processed serially


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James Taylor 2013-02-09, 01:49
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Marcos Ortiz 2013-02-09, 03:18
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lars hofhansl 2013-02-09, 02:51
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James Taylor 2013-02-09, 05:52
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lars hofhansl 2013-02-09, 17:02
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James Taylor 2013-02-09, 17:28
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lars hofhansl 2013-02-09, 19:04
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Re: independent scans to same region processed serially
Filed https://issues.apache.org/jira/browse/HBASE-7805
Test case attached
It occurs only if the table has a region observer coprocessor.

     James

On 02/09/2013 11:04 AM, lars hofhansl wrote:
> If I execute in parallel multiple scans to different parts of the same region, they appear to be processed serially. It's actually faster from the client side to execute a single serial scan than it is to execute multiple parallel scans to different segments of the region. I do have region observer coprocessors for the table I'm scanning, but my code is not doing any synchronization.
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ramkrishna vasudevan 2013-02-09, 10:48
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lars hofhansl 2013-02-09, 16:49
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB