Github user DaveBirdsall commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/766#discussion_r84124876
--- Diff: core/sql/optimizer/opt.cpp ---
@@ -5034,6 +5029,20 @@ void OptDefaults::initialize(RelExpr* rootExpr)
preFetchHistograms_ = FALSE;
}
+ // Find out what the RMS security key invalidation garbage collection
+ // interval is (this mirrors the logic in runtimestats/ssmpipc.cpp), so
+ // we can fail-safe the histogram cache.
+
+ char *sct = getenv("RMS_SIK_GC_INTERVAL_SECONDS"); // in seconds
+ if (sct)
+ {
+ siKeyGCinterval_ = ((Int64) str_atoi(sct, str_len(sct)));
+ if (siKeyGCinterval_ < 10)
+ siKeyGCinterval_ = 10;
+ }
+ else
+ siKeyGCinterval_ = (Int64)24 * 60 * 60; // 24 hours
+
--- End diff --
Environment variable values are inherited at process create time. I suppose
it is possible that we could write code in our processes to change it but that
seems a devilish thing to do. I've followed the same design used for caching
CQD values in opt.cpp.
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