Description
For large data tables with many regions, if we build the index asynchronously using the IndexTool, the index table will initial face a hotspot as all data region mappers attempt to write to the sole new index region. This can potentially lead to the index getting disabled if writes to the index table timeout during this hotspotting.
We can add an optional step (or perhaps activate it based on the count of regions in the data table) to the IndexTool to first do a MR job to gather stats on the indexed column values, and then attempt to presplit the index table before we do the actual index build MR job.
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Issue Links
- is related to
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PHOENIX-4746 Pre-split index tables during synchronous creation
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- Open
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