Details
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Brainstorming
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Status: Closed
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Critical
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Resolution: Fixed
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0.90.1
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None
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Adds an allocation buffer local to each memstore which is used to combat heap fragmentation. Experimental in 0.90.1 - enable by toggling hbase.hregion.memstore.mslab.enabled. Enabled by default in 0.91
Description
Stop-the-world GC pauses have long been a problem in HBase. "Concurrent mode failures" can usually be tuned around by setting the initiating occupancy fraction low, but eventually the heap becomes fragmented and a promotion failure occurs.
This JIRA is to do research/experiments about the heap fragmentation issue and possible solutions.
