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Section 4 — Durability

Returning to the window where we were running our test workload we see these messages at the time of the outage:

  • 2020-12-16 14:50:25:ReportUsageCreditCallback user=1772061:Connection to database host (vdb3/172.31.23.36:21212) was lost before a response was received

Or:

  • 2020-12-16 14:50:25:ReportUsageCreditCallback user=1772061:Connection to database host (vdb3/172.31.23.36:21212) was lost before a response was received

In either case the appropriate course of action would be to re-try the transaction, something which is outside the scope of this sandbox.

Within a couple of minutes the volt.log will show the server restarting:

  • 2020-12-1614:51:33,930 INFO [main] CONSOLE: Initializing VoltDB…
  • 2020-12-1614:51:33,931 INFO [mainl HOST: Searching for license file located at /voltdbdata/voltdbroot/license.xml
  • 2020-12-1614:51:34,070 INFO [main] HOST: Found VoltDB license file at /voltdbdata/voltdbroot/license.xml
  • 2020-12-1614:51:34,071 INFO [mainl CONSOLE: Build: 10.0.1 voltdb-10.o.1-o-g51e526d-local Enterprise Edition
  • 2020-12-1614:51:34,071 INFO [main] CONSOLE: Licensed to: VoltDB Field Engineering

Returning to Grafana we can see the outage and recovery on node vdb3:

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