Abstract
Compactions were introduced in Chapter 2 . In this chapter, I will discuss compactions in more detail. Each flush of the MemStore generates a StoreFile, which is façade on an HFile. The MemStore size at which a flush is performed is set in hbase.hregion.memstore.flush.size, which is 128MB by default. The MemStore size is checked at a frequency set in hbase.server.thread.wakefrequency, which has a default of 10,000 ms. If the number of StoreFiles in a store exceed some limits/thresholds, the files are compacted into larger StoreFiles. Compaction is the process of creating a larger StoreFile (HFile) file by merging smaller StoreFilefiles.
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© 2016 Deepak Vohra
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Vohra, D. (2016). Compactions. In: Apache HBase Primer. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-2424-3_11
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DOI: https://doi.org/10.1007/978-1-4842-2424-3_11
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