DBI tweaks for concurrent writes to SQLite

PredictiveEcology · Feb 14, 2020 · c4d454f · c4d454f
1 parent 089eb65
commit c4d454f
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Showing 3 changed files with 19 additions and 8 deletions.
diff --git a/R/DBI.R b/R/DBI.R
@@ -25,17 +25,23 @@ createCache <- function(cachePath, drv = getOption("reproducible.drv", RSQLite::
   checkPath(CacheStorageDir(cachePath), create = TRUE)
   if (useDBI()) {
     if (is.null(conn)) {
-    conn <- dbConnectAll(drv, cachePath = cachePath)
-    on.exit(dbDisconnect(conn))
+      conn <- dbConnectAll(drv, cachePath = cachePath)
+      on.exit(dbDisconnect(conn))
     }
   }
   dt <- .emptyCacheTable
 
-  retry(retries = 250, exponentialDecayBase = 1.01, quote(
-    dbWriteTable(conn, CacheDBTableName(cachePath, drv), dt, overwrite = TRUE,
-                 field.types = c(cacheId = "text", tagKey = "text",
-                                 tagValue = "text", createdDate = "text")))
-  )
+  # Some tough to find cases where stalls on dbWriteTable -- this *may* prevent some
+  a <- retry(retries = 250, exponentialDecayBase = 1.01,
+        quote(dbListTables(conn)))
+
+  if (isTRUE(!CacheDBTableName(cachePath, drv) %in% a))
+    #retry(retries = 5, exponentialDecayBase = 1.5, quote(
+      try(dbWriteTable(conn, CacheDBTableName(cachePath, drv), dt, overwrite = FALSE,
+                   field.types = c(cacheId = "text", tagKey = "text",
+                                   tagValue = "text", createdDate = "text")), silent = TRUE)
+    #)
+
 }
 
 #' @rdname cacheTools

diff --git a/R/cache.R b/R/cache.R
@@ -558,7 +558,8 @@ setMethod(
                                 dbTabName = dbTabNam,
                                 outputHash = outputHash,
                                 .con = conn)
-          res <- retry(quote(dbSendQuery(conn, qry)))
+          res <- retry(retries = 15, exponentialDecayBase = 1.01,
+                       quote(dbSendQuery(conn, qry)))
           isInRepo <- setDT(dbFetch(res))
           dbClearResult(res)
         } else {

diff --git a/tests/testthat/test-cluster.R b/tests/testthat/test-cluster.R
@@ -28,6 +28,7 @@ test_that("test parallel collisions", {
     if (interactive()) {
       of <- tmpfile[3]
       cl <- makeCluster(N, outfile = of)
+      print(paste("log file is", of))
     } else {
       cl <- makeCluster(N)
     }
@@ -40,6 +41,9 @@ test_that("test parallel collisions", {
     # })
     numToRun <- 40
     skip_on_os("mac")
+    # THere is a creating Cache at the same time problem -- haven't resolved
+    #  Just make cache first and it seems fine
+    Cache(rnorm, 1, cacheRepo = tmpdir)
     a <- try(clusterMap(cl = cl, fun, seq(numToRun), cacheRepo = tmpdir, .scheduling = "dynamic"),
              silent = FALSE)
     expect_false(is(a, "try-error"))