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  1. Phoenix
  2. PHOENIX-1177 Cost-based query optimization
  3. PHOENIX-195

Gather and maintain stats for HBase tables in a designated HBase table

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    Details

    • Type: Sub-task
    • Status: Resolved
    • Resolution: Duplicate
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: None
    • Labels:
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    • old issue number:
      64

      Description

      Our current stats gathering is way too simplistic - it's only keeping a cache per client connection to a cluster for the min and max key for a table. Instead, we should:

      1. have a system table that stores the stats
      2. create a coprocessor that updates the stats during compaction (i.e. using the preCompactSelection, postCompactSelection, preCompact, postCompact methods)
      3. keep a kind of histogram - the key boundary of every N bytes within a region. Perhaps we can do a delta update on minor compaction and a complete update on major compaction.
      4. keep the min key/max key of a table in the stats table too

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            • Assignee:
              ram_krish ramkrishna.s.vasudevan
              Reporter:
              jamestaylor James R. Taylor
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