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77e010ae4e
Uses a thread pool to issue many compute stats commands in parallel to Impala, rather than doing it serially. Where it was obvious, I combined multiple stats commands into fewer, to reduce the number of "show databses" and serialized "show tables" commands. This speeds up the compute stats step in data loading significantly. My measurements for testdata/bin/compute-table-stats.sh running before and after this change, with the Impala daemons restarted (cold) or not restarted (warm) on an 8-core, 32GB RAM machine were: old, cold: 7m44s new, cold: 1m42s old, warm: 1m23s new, warm: 48s The data load in the full test build behaves in a cold fashion. It's typical for https://jenkins.impala.io/job/ubuntu-16.04-from-scratch/ to run this compute stats step for 9 or 10 minutes. With this change, this will come down to about 2 minutes. Change-Id: Ifb080f2552b9dbe304ecadd6e52429214094237d Reviewed-on: http://gerrit.cloudera.org:8080/8354 Reviewed-by: David Knupp <dknupp@cloudera.com> Tested-by: Impala Public Jenkins