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Re: Short-circuit reads
For hbase internal checksum, it is not in hbase 0.92.x release.

Please use 0.94.2 or newer release.


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