Merge pull request #206 from ssb-ngi-pointer/faster-empty-db-query

Improve performance of query when seq is far behind log

index.js

@@ -644,10 +644,14 @@ module.exports = function (log, indexesPath) {
         const index = newIndexes[indexName]
         if (doneIndexing) indexes[indexName] = index
         index.offset = offset
-        done(() => {
-          saveIndex(indexName, index, count)
-        })
       }
+
+      done(() => {
+        for (var indexName in newIndexes) {
+          const index = newIndexes[indexName]
+          saveIndex(indexName, index, count)
+        }
+      })
     }
 
     const logstreamId = Math.ceil(Math.random() * 1000)
@@ -1092,9 +1096,6 @@ module.exports = function (log, indexesPath) {
       // kick-start this chain with a dummy null value
       push.values([null]),
 
-      // ensure that the seq->offset index is synchronized with the log
-      push.asyncMap((_, next) => ensureSeqIndexSync(next)),
-
       // load lazy indexes, if any
       push.asyncMap((_, next) => {
         const lazyIdxNames = detectLazyIndexesUsed(operation)
@@ -1117,6 +1118,9 @@ module.exports = function (log, indexesPath) {
         createIndexes(opsMissingIdx, next)
       }),
 
+      // ensure that the seq->offset index is synchronized with the log
+      push.asyncMap((_, next) => ensureSeqIndexSync(next)),
+
       // get bitset for the input operation, and cache it
       push.asyncMap((_, next) => {
         getBitsetForOperation(operation, (bitset, filters) => {

package.json

@@ -57,8 +57,8 @@
     "ssb-keys": "^8.1.0",
     "ssb-ref": "^2.14.3",
     "ssb-validate": "^4.1.1",
+    "tap-arc": "^0.3.4",
     "tap-bail": "^1.0.0",
-    "tap-arc": "^0.1.2",
     "tape": "^5.2.2"
   },
   "scripts": {