Thanks J-D. I found it with JConsole in hadoop/HBase/RegionServerStatistics/Attributes.
JM 2013/1/27, Jean-Daniel Cryans <[email protected]>: > It's in the region server metrics and also published through JMX. > > J-D > > On Sun, Jan 27, 2013 at 2:55 PM, Jean-Marc Spaggiari > <[email protected]> wrote: >> Hi J-D, >> >> In your presentation, where are you getting the >> hdfsBlocksLocalityIndex value? I'm not able to find it in my UI... >> >> Thanks, >> >> JM >> >> 2013/1/27, Jean-Daniel Cryans <[email protected]>: >>> On Sun, Jan 27, 2013 at 2:38 PM, Jean-Marc Spaggiari >>> <[email protected]> wrote: >>>> Does this have a significant increase on HBase performances? >>> >>> Ted beats me to linking to my own presentation :P >>> >>>> And what >>>> are the "risks" associated with short-circuit activation (if any)? No >>>> risks of corrupting data? >>> >>> No, nothing, apart. >>> >>>> >>>> Can this be activated after tables are already populated? >>> >>> Not related at all, this is a region server configuration. >>> >>>> >>>> JM >>>> >>>> 2013/1/27, Ted <[email protected]>: >>>>> 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 >>>>> >>> >
