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HBase and data locality

By Lars Hofhansl A quick note about data locality. In distributed systems data locality is an important property. Data locality, here, refers to the ability to move the computation close to where the data is. This is one of the key concepts of MapReduce in Hadoop. The distributed file system provides the framework with locality information, which is then used to split the computation into chunks w

dayafterneet 2013/07/30

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HBase durability guarantees

dayafterneet 2013/05/07

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HBase Profiling

dayafterneet 2012/12/16

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Pluggable compaction and scanning policies

As I described here, HBase maintains multiple versions of all key-values (KVs) stored and has two essential knobs to control the collection old versions: TimeToLive (TTL) and MaximumNumberOfVersion (versions). These two attributes are "statically" defined for each column family. To change these the table needs to be disabled, the column families changed, and then the table needs to be enabled agai