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seen Dec 11 at 20:39

I do Bioinformtics research and work as a Bioinformtics systems + databases administrator.

As of February 2011, I'm active on Biostar stackexchange - it's a Question and Answer website for Bioinformatics.


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revised HBASE Space Used Started Climbing Rapidly
added 3 characters in body
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answered HBASE Space Used Started Climbing Rapidly
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comment Hbase catalog tables custom location
I don't know of a permanent way of "pinning" the ROOT and META to hosts. However, to do an experiment, you can move ROOT and META by temporary shutting down (for a minute or two) the regionserver that they are hosted on. After the regionserver is back, check that ROOT and META migrated, and see if that reduces the network flow between the regionservers. If not, then it's something else: e.g. hadoop datanodes are usually sharing hosts with hbase. Datanodes replicate all data across to the other host(s). Regionservers also read and write remotely to datanodes on other hosts.
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comment How to capture retransmitted packet info with tcpdump?
I'll take a script that does f=/sys/kernel/debug/tracing/events/skb/tcp_retransmit_skb/enable; echo 1 > $f; sleep 10; echo 0 > $f and then parses /sys/kernel/debug/tracing/trace
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