[NO ISSUE][CONF] Reduced Metadata Datasets Memory Budget

- user model changes: no
- storage format changes: no
- interface changes: no

Details:
- Reduce memory budget of metadata datasets from
  32 to 8 pages.

Change-Id: I01b92778eda67c2ad93babc92ba509765d63fb43
Reviewed-on: https://asterix-gerrit.ics.uci.edu/2450
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: Till Westmann <tillw@apache.org>
diff --git a/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/config/StorageProperties.java b/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/config/StorageProperties.java
index e813968..6a6e649 100644
--- a/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/config/StorageProperties.java
+++ b/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/config/StorageProperties.java
@@ -44,7 +44,7 @@
         STORAGE_MEMORYCOMPONENT_GLOBALBUDGET(LONG_BYTE_UNIT, Runtime.getRuntime().maxMemory() / 4),
         STORAGE_MEMORYCOMPONENT_PAGESIZE(INTEGER_BYTE_UNIT, StorageUtil.getIntSizeInBytes(128, KILOBYTE)),
         STORAGE_MEMORYCOMPONENT_NUMCOMPONENTS(INTEGER, 2),
-        STORAGE_METADATA_MEMORYCOMPONENT_NUMPAGES(INTEGER, 32),
+        STORAGE_METADATA_MEMORYCOMPONENT_NUMPAGES(INTEGER, 8),
         STORAGE_LSM_BLOOMFILTER_FALSEPOSITIVERATE(DOUBLE, 0.01d),
         STORAGE_MAX_ACTIVE_WRITABLE_DATASETS(INTEGER, 8);
 
@@ -105,7 +105,7 @@
         @Override
         public String usageDefaultOverride(IApplicationConfig accessor, Function<IOption, String> optionPrinter) {
             if (this == STORAGE_METADATA_MEMORYCOMPONENT_NUMPAGES) {
-                return "32 pages";
+                return "8 pages";
             }
             return null;
         }