[ASTERIXDB-2183][STO] Remove On-disk Inverted List Latch

Change-Id: Idcf0df5119824f0ef6761d514ccbd82af678a797
Reviewed-on: https://asterix-gerrit.ics.uci.edu/2328
Sonar-Qube: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Contrib: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Ian Maxon <imaxon@apache.org>
diff --git a/hyracks-fullstack/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/org/apache/hyracks/storage/am/lsm/invertedindex/ondisk/FixedSizeElementInvertedListCursor.java b/hyracks-fullstack/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/org/apache/hyracks/storage/am/lsm/invertedindex/ondisk/FixedSizeElementInvertedListCursor.java
index 94ce348..75bdbc4 100644
--- a/hyracks-fullstack/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/org/apache/hyracks/storage/am/lsm/invertedindex/ondisk/FixedSizeElementInvertedListCursor.java
+++ b/hyracks-fullstack/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/org/apache/hyracks/storage/am/lsm/invertedindex/ondisk/FixedSizeElementInvertedListCursor.java
@@ -96,7 +96,6 @@
         int pix = 0;
         for (int i = startPageId; i <= endPageId; i++) {
             pages[pix] = bufferCache.pin(BufferedFileHandle.getDiskPageId(fileId, i), false);
-            pages[pix].acquireReadLatch();
             pix++;
         }
         pinned = true;
@@ -106,7 +105,6 @@
     public void unpinPages() throws HyracksDataException {
         int numPages = endPageId - startPageId + 1;
         for (int i = 0; i < numPages; i++) {
-            pages[i].releaseReadLatch();
             bufferCache.unpin(pages[i]);
         }
         pinned = false;