Archivo mensual: noviembre 2014

vi sudo save with root permissions / grabar cambios con permisos de root


Just: :w !sudo tee % % is current file. !sudo tee calls tee with administrator privileges and writes to current file.  But not vi buffered file. That’s why you will see a warning like this when using the command: W12: … Seguir leyendo

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MapReduce: Compression and Input Splits


This is something that always rise doubts: When considering compressed data that will be processed by MapReduce, it is important to check if the compression format supports splitting. If not, the number of map tasks may not be the expected. … Seguir leyendo

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skb rides the rocket


[21068723.434629] xen_netfront: xennet: skb rides the rocket: 19 slots skb rides the rocket bug, this issue affects often Hadoop clusters. Each time I face it, I remember this excelent blog post from Brendan Gregg: http://www.brendangregg.com/blog/2014-09-11/perf-kernel-line-tracing.html Enjoy

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