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HBase, mail # user - Short-circuit reads


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David Koch 2013-01-27, 22:29
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Jean-Daniel Cryans 2013-01-27, 22:45
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Re: Short-circuit reads
Ted 2013-01-27, 22:34
For hbase internal checksum, it is not in hbase 0.92.x release.

Please use 0.94.2 or newer release.

Thanks

On Jan 27, 2013, at 2:29 PM, David Koch <[EMAIL PROTECTED]> wrote:

> Hello,
>
> I read about "short circuit reads" in the HBase documentation's performance
> section[1] and was wondering what people's experiences were using this in a
> production setting.
>
> Also,
>
> 1. Since only one dedicated user can take advantage of the feature do you
> launch all jobs as this user?
> 2. Can dfs.client.read.shortcircuit be set to false for jobs wich are not
> launched by the short-circuit user in order to avoid exceptions? In other
> words - can this setting be overriden by the client configuration's
> hbase-site.xml?
> 3. In the same context, it is suggested to enable HBase internal
> checksums[2]. Is this a feature which can be enabled in HBase 0.92.1 which
> is part of the Cloudera 4.1.x release?
>
> Thank you,
>
> /David
>
> [1] http://hbase.apache.org/book/perf.hdfs.html#ftn.d2145e7370
> [2] https://issues.apache.org/jira/browse/HBASE-5074
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Jean-Marc Spaggiari 2013-01-27, 22:38
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Jean-Daniel Cryans 2013-01-27, 22:50
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Jean-Marc Spaggiari 2013-01-27, 22:55
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David Koch 2013-01-27, 23:16
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Jean-Daniel Cryans 2013-01-28, 02:56
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Jean-Marc Spaggiari 2013-01-28, 12:45
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Ted Yu 2013-01-27, 22:45