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visits member for 3 years, 8 months
seen Jun 7 at 18:03

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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awarded  Curious
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awarded  Notable Question
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awarded  Popular Question
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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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awarded  Popular Question
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awarded  Necromancer
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awarded  Yearling
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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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asked How to capture retransmitted packet info with tcpdump?
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awarded  Quorum
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awarded  Yearling
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answered Java process failure (hadoop, hbase)
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awarded  Caucus