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Re: why i can't configure "-XX:+UseConcMarkSweepGC...

by New Contributor in Support Questions
‎11-21-2013 04:54 PM
‎11-21-2013 04:54 PM
Hi clint,   Thank you for your help. I use JDK6u45. And now i knew that cloudera advice me another script to replcae "graceful_stop.sh". About the last question, i just found a lot of blogs about "how to improve hbase performance". There is an advice in these articles : "hlog.blocksize*maxlogs  must be  larger than HBASE_HEAPSIZE*lowerLimit ". So i ask you to varify these advice.   yyx ... View more

why i can't configure "-XX:+UseConcMarkSweepGC" in...

by New Contributor in Support Questions
‎11-17-2013 11:45 PM
‎11-17-2013 11:45 PM
Hi all,   I read the book "hbase in action" and check the configuration for hbase gc. But when i use the same configuration in hbase-0.94.6-cdh4.4.0, and find that :" Unrecognized VM option 'UseConcMarkSweepGC' Could not create the Java virtual machine. " why these messages happen?   Another questions :  why some scripts are disappeared in cdh4 hbase like "add_table.rb" and "graceful_stop.sh"? did Cloudera aggregate or deprecate them?   And some one advice me that "config 'hbase.regionserver.hlog.blocksize * hbase.regionserver.maxlogs' larger than 'hbase.regionserver.global.memstore.lowerLimit * HBASE_HEAPSIZE'."  Is it correct for hbase cdh4.4.0? I find that 'hbase.regionserver.hlog.blocksize' and 'hbase.regionserver.maxlogs'  are not the default properties in hbase-default.xml. So can you tell me the default values of these properties.      Thanks for your reply！   yyx, ... View more
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Member Since ‎11-17-2013 11:45 PM
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