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Posted to commits@lucene.apache.org by ma...@apache.org on 2020/08/16 17:04:18 UTC

[lucene-solr] 01/02: @552 honestly I can go on and on, I could explain every natural phenomenon The tide, the grass, the ground, oh That was me, I was messing around

This is an automated email from the ASF dual-hosted git repository.

markrmiller pushed a commit to branch reference_impl_dev
in repository https://gitbox.apache.org/repos/asf/lucene-solr.git

commit a7223743887fb48f3d3edfac6c08c129462c3ca8
Author: markrmiller@gmail.com <ma...@gmail.com>
AuthorDate: Sat Aug 15 20:39:35 2020 -0500

    @552 honestly I can go on and on, I could explain every natural phenomenon
    The tide, the grass, the ground, oh
    That was me, I was messing around
---
 .../src/java/org/apache/solr/core/SolrConfig.java  |  94 ++++++++++++---
 .../java/org/apache/solr/core/SolrXmlConfig.java   | 100 ++++++++++++++--
 .../java/org/apache/solr/core/XmlConfigFile.java   |  93 +++++++++------
 .../java/org/apache/solr/schema/IndexSchema.java   | 131 +++++++++++++++++----
 .../java/org/apache/solr/search/CacheConfig.java   |  11 +-
 .../org/apache/solr/update/SolrIndexConfig.java    |  65 +++++++++-
 .../test/org/apache/solr/core/TestBadConfig.java   |   2 +-
 .../org/apache/solr/core/TestCodecSupport.java     |   8 +-
 .../src/test/org/apache/solr/core/TestConfig.java  |   9 +-
 .../src/java/org/apache/solr/SolrTestCase.java     |   2 +-
 10 files changed, 416 insertions(+), 99 deletions(-)

diff --git a/solr/core/src/java/org/apache/solr/core/SolrConfig.java b/solr/core/src/java/org/apache/solr/core/SolrConfig.java
index fd6fb19..0bb02b9 100644
--- a/solr/core/src/java/org/apache/solr/core/SolrConfig.java
+++ b/solr/core/src/java/org/apache/solr/core/SolrConfig.java
@@ -20,6 +20,8 @@ package org.apache.solr.core;
 import javax.xml.parsers.ParserConfigurationException;
 import javax.xml.stream.XMLStreamException;
 import javax.xml.xpath.XPathConstants;
+import javax.xml.xpath.XPathExpression;
+import javax.xml.xpath.XPathExpressionException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -46,6 +48,7 @@ import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 import com.google.common.collect.ImmutableList;
+import org.apache.commons.collections.map.UnmodifiableOrderedMap;
 import org.apache.commons.io.FileUtils;
 import org.apache.lucene.index.IndexDeletionPolicy;
 import org.apache.lucene.search.IndexSearcher;
@@ -109,6 +112,53 @@ public class SolrConfig extends XmlConfigFile implements MapSerializable {
 
   public static final String DEFAULT_CONF_FILE = "solrconfig.xml";
 
+  private static XPathExpression luceneMatchVersionExp;
+  private static XPathExpression indexDefaultsExp;
+  private static XPathExpression mainIndexExp;
+  private static XPathExpression nrtModeExp;
+  private static XPathExpression unlockOnStartupExp;
+
+  static String luceneMatchVersionPath = "/config/" + IndexSchema.LUCENE_MATCH_VERSION_PARAM;
+
+  static String indexDefaultsPath = "/config/indexDefaults";
+
+  static String mainIndexPath = "/config/mainIndex";
+  static String nrtModePath = "/config/indexConfig/nrtmode";
+
+  static String unlockOnStartupPath = "/config/indexConfig/unlockOnStartup";
+
+  static {
+
+
+    try {
+
+      luceneMatchVersionExp = IndexSchema.getXpath().compile(luceneMatchVersionPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+
+    try {
+      indexDefaultsExp = IndexSchema.getXpath().compile(indexDefaultsPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+    try {
+      mainIndexExp = IndexSchema.getXpath().compile(mainIndexPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+    try {
+      nrtModeExp = IndexSchema.getXpath().compile(nrtModePath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+    try {
+      unlockOnStartupExp = IndexSchema.getXpath().compile(unlockOnStartupPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+  }
+
   private volatile RequestParams requestParams;
 
   public enum PluginOpts {
@@ -178,21 +228,21 @@ public class SolrConfig extends XmlConfigFile implements MapSerializable {
     getOverlay();//just in case it is not initialized
     getRequestParams();
     initLibs(loader, isConfigsetTrusted);
-    luceneMatchVersion = SolrConfig.parseLuceneVersionString(getVal(IndexSchema.LUCENE_MATCH_VERSION_PARAM, true));
+    luceneMatchVersion = SolrConfig.parseLuceneVersionString(getVal(luceneMatchVersionExp, luceneMatchVersionPath, true));
     log.info("Using Lucene MatchVersion: {}", luceneMatchVersion);
 
     String indexConfigPrefix;
 
     // Old indexDefaults and mainIndex sections are deprecated and fails fast for luceneMatchVersion=>LUCENE_4_0_0.
     // For older solrconfig.xml's we allow the old sections, but never mixed with the new <indexConfig>
-    boolean hasDeprecatedIndexConfig = (getNode("indexDefaults", false) != null) || (getNode("mainIndex", false) != null);
+    boolean hasDeprecatedIndexConfig = (getNode(indexDefaultsExp, indexDefaultsPath, false) != null) || (getNode(mainIndexExp, mainIndexPath, false) != null);
     if (hasDeprecatedIndexConfig) {
       throw new SolrException(ErrorCode.FORBIDDEN, "<indexDefaults> and <mainIndex> configuration sections are discontinued. Use <indexConfig> instead.");
     } else {
       indexConfigPrefix = "indexConfig";
     }
     assertWarnOrFail("The <nrtMode> config has been discontinued and NRT mode is always used by Solr." +
-            " This config will be removed in future versions.", getNode(indexConfigPrefix + "/nrtMode", false) == null,
+            " This config will be removed in future versions.", getNode(nrtModeExp, nrtModePath, false) == null,
         true
     );
     assertWarnOrFail("Solr no longer supports forceful unlocking via the 'unlockOnStartup' option.  "+
@@ -200,7 +250,7 @@ public class SolrConfig extends XmlConfigFile implements MapSerializable {
                      "it would be dangerous and should not be done.  For other lockTypes and/or "+
                      "directoryFactory options it may also be dangerous and users must resolve "+
                      "problematic locks manually.",
-                     null == getNode(indexConfigPrefix + "/unlockOnStartup", false),
+                     null == getNode(unlockOnStartupExp, unlockOnStartupPath, false),
                      true // 'fail' in trunk
                      );
                      
@@ -837,39 +887,53 @@ public class SolrConfig extends XmlConfigFile implements MapSerializable {
     return enableStreamBody;
   }
 
-  @Override
   public int getInt(String path) {
     return getInt(path, 0);
   }
 
-  @Override
+  // nocommit
   public int getInt(String path, int def) {
     Object val = overlay.getXPathProperty(path);
     if (val != null) return Integer.parseInt(val.toString());
-    return super.getInt(path, def);
+    try {
+      path = super.normalize(path);
+      return super.getInt(IndexSchema.getXpath().compile(path), path, def);
+    } catch (XPathExpressionException e) {
+      throw new SolrException(ErrorCode.BAD_REQUEST, e);
+    }
   }
 
-  @Override
   public boolean getBool(String path, boolean def) {
     Object val = overlay.getXPathProperty(path);
     if (val != null) return Boolean.parseBoolean(val.toString());
-    return super.getBool(path, def);
+    try {
+      path = super.normalize(path);
+      return super.getBool(IndexSchema.getXpath().compile(path), path, def);
+    } catch (XPathExpressionException e) {
+      throw new SolrException(ErrorCode.BAD_REQUEST, e);
+    }
   }
 
-  @Override
   public String get(String path) {
     Object val = overlay.getXPathProperty(path, true);
-    return val != null ? val.toString() : super.get(path);
+    try {
+      path = super.normalize(path);
+      return val != null ? val.toString() : super.get(IndexSchema.getXpath().compile(path), path);
+    } catch (XPathExpressionException e) {
+      throw new SolrException(ErrorCode.BAD_REQUEST, e);
+    }
   }
 
-  @Override
   public String get(String path, String def) {
     Object val = overlay.getXPathProperty(path, true);
-    return val != null ? val.toString() : super.get(path, def);
-
+    try {
+      path = super.normalize(path);
+      return val != null ? val.toString() : super.get(IndexSchema.getXpath().compile(path), path, def);
+    } catch (XPathExpressionException e) {
+      throw new SolrException(ErrorCode.BAD_REQUEST, e);
+    }
   }
 
-  @Override
   @SuppressWarnings({"unchecked", "rawtypes"})
   public Map<String, Object> toMap(Map<String, Object> result) {
     if (getZnodeVersion() > -1) result.put(ZNODEVER, getZnodeVersion());
diff --git a/solr/core/src/java/org/apache/solr/core/SolrXmlConfig.java b/solr/core/src/java/org/apache/solr/core/SolrXmlConfig.java
index c7bd84c..92cccb6 100644
--- a/solr/core/src/java/org/apache/solr/core/SolrXmlConfig.java
+++ b/solr/core/src/java/org/apache/solr/core/SolrXmlConfig.java
@@ -24,6 +24,7 @@ import org.apache.solr.common.SolrException;
 import org.apache.solr.common.util.NamedList;
 import org.apache.solr.logging.LogWatcherConfig;
 import org.apache.solr.metrics.reporters.SolrJmxReporter;
+import org.apache.solr.schema.IndexSchema;
 import org.apache.solr.update.UpdateShardHandlerConfig;
 import org.apache.solr.util.DOMUtil;
 import org.apache.solr.util.JmxUtil;
@@ -38,6 +39,7 @@ import static org.apache.solr.common.params.CommonParams.NAME;
 import javax.management.MBeanServer;
 import javax.xml.xpath.XPath;
 import javax.xml.xpath.XPathConstants;
+import javax.xml.xpath.XPathExpression;
 import javax.xml.xpath.XPathExpressionException;
 import java.io.ByteArrayInputStream;
 import java.io.InputStream;
@@ -66,6 +68,79 @@ public class SolrXmlConfig {
 
   private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
 
+  private static XPathExpression shardHandlerFactoryExp;
+  private static XPathExpression counterExp;
+  private static XPathExpression meterExp;
+  private static XPathExpression timerExp;
+  private static XPathExpression histoExp;
+  private static XPathExpression historyExp;
+  private static XPathExpression transientCoreCacheFactoryExp;
+  private static XPathExpression tracerConfigExp;
+
+
+  static String shardHandlerFactoryPath = "solr/shardHandlerFactory";
+
+  static String counterExpPath = "solr/metrics/suppliers/counter";
+  static String meterPath = "solr/metrics/suppliers/meter";
+
+  static String timerPath = "solr/metrics/suppliers/timer";
+
+  static String histoPath = "solr/metrics/suppliers/histogram";
+
+  static String historyPath = "solr/metrics/history";
+
+  static String  transientCoreCacheFactoryPath =  "solr/transientCoreCacheFactory";
+
+  static String  tracerConfigPath = "solr/tracerConfig";
+
+  static {
+
+
+    try {
+
+      shardHandlerFactoryExp = IndexSchema.getXpath().compile(shardHandlerFactoryPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+
+    try {
+      counterExp = IndexSchema.getXpath().compile(counterExpPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+    try {
+      meterExp = IndexSchema.getXpath().compile(meterPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+    try {
+      timerExp = IndexSchema.getXpath().compile(timerPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+    try {
+      histoExp = IndexSchema.getXpath().compile(histoPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+    try {
+      historyExp = IndexSchema.getXpath().compile(historyPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+    try {
+      transientCoreCacheFactoryExp = IndexSchema.getXpath().compile(transientCoreCacheFactoryPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+    try {
+      tracerConfigExp = IndexSchema.getXpath().compile(tracerConfigPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+
+  }
+
   public static NodeConfig fromConfig(Path solrHome, XmlConfigFile config, boolean fromZookeeper) {
 
     checkForIllegalConfig(config);
@@ -221,12 +296,13 @@ public class SolrXmlConfig {
       throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Multiple instances of " + section + " section found in solr.xml");
   }
 
+  // nocommit - we should be able to bring this back now
   private static void failIfFound(XmlConfigFile config, String xPath) {
 
-    if (config.getVal(xPath, false) != null) {
-      throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Should not have found " + xPath +
-          "\n. Please upgrade your solr.xml: https://lucene.apache.org/solr/guide/format-of-solr-xml.html");
-    }
+//    if (config.getVal(xPath, false) != null) {
+//      throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Should not have found " + xPath +
+//          "\n. Please upgrade your solr.xml: https://lucene.apache.org/solr/guide/format-of-solr-xml.html");
+//    }
   }
 
   private static Properties loadProperties(XmlConfigFile config) {
@@ -504,7 +580,7 @@ public class SolrXmlConfig {
   }
 
   private static PluginInfo getShardHandlerFactoryPluginInfo(XmlConfigFile config) {
-    Node node = config.getNode("solr/shardHandlerFactory", false);
+    Node node = config.getNode(shardHandlerFactoryExp, shardHandlerFactoryPath, false);
     return (node == null) ? null : new PluginInfo(node, "shardHandlerFactory", false, true);
   }
 
@@ -521,23 +597,23 @@ public class SolrXmlConfig {
 
   private static MetricsConfig getMetricsConfig(XmlConfigFile config) {
     MetricsConfig.MetricsConfigBuilder builder = new MetricsConfig.MetricsConfigBuilder();
-    Node node = config.getNode("solr/metrics/suppliers/counter", false);
+    Node node = config.getNode(counterExp, counterExpPath, false);
     if (node != null) {
       builder = builder.setCounterSupplier(new PluginInfo(node, "counterSupplier", false, false));
     }
-    node = config.getNode("solr/metrics/suppliers/meter", false);
+    node = config.getNode(meterExp, meterPath, false);
     if (node != null) {
       builder = builder.setMeterSupplier(new PluginInfo(node, "meterSupplier", false, false));
     }
-    node = config.getNode("solr/metrics/suppliers/timer", false);
+    node = config.getNode(timerExp, timerPath, false);
     if (node != null) {
       builder = builder.setTimerSupplier(new PluginInfo(node, "timerSupplier", false, false));
     }
-    node = config.getNode("solr/metrics/suppliers/histogram", false);
+    node = config.getNode(histoExp, histoPath, false);
     if (node != null) {
       builder = builder.setHistogramSupplier(new PluginInfo(node, "histogramSupplier", false, false));
     }
-    node = config.getNode("solr/metrics/history", false);
+    node = config.getNode(historyExp, historyPath, false);
     if (node != null) {
       builder = builder.setHistoryHandler(new PluginInfo(node, "history", false, false));
     }
@@ -597,12 +673,12 @@ public class SolrXmlConfig {
   }
 
   private static PluginInfo getTransientCoreCacheFactoryPluginInfo(XmlConfigFile config) {
-    Node node = config.getNode("solr/transientCoreCacheFactory", false);
+    Node node = config.getNode(transientCoreCacheFactoryExp, transientCoreCacheFactoryPath, false);
     return (node == null) ? null : new PluginInfo(node, "transientCoreCacheFactory", false, true);
   }
 
   private static PluginInfo getTracerPluginInfo(XmlConfigFile config) {
-    Node node = config.getNode("solr/tracerConfig", false);
+    Node node = config.getNode(tracerConfigExp, tracerConfigPath, false);
     return (node == null) ? null : new PluginInfo(node, "tracerConfig", false, true);
   }
 }
diff --git a/solr/core/src/java/org/apache/solr/core/XmlConfigFile.java b/solr/core/src/java/org/apache/solr/core/XmlConfigFile.java
index 2a87041..76f3455 100644
--- a/solr/core/src/java/org/apache/solr/core/XmlConfigFile.java
+++ b/solr/core/src/java/org/apache/solr/core/XmlConfigFile.java
@@ -46,6 +46,7 @@ import javax.xml.transform.dom.DOMResult;
 import javax.xml.transform.dom.DOMSource;
 import javax.xml.xpath.XPath;
 import javax.xml.xpath.XPathConstants;
+import javax.xml.xpath.XPathExpression;
 import javax.xml.xpath.XPathExpressionException;
 import javax.xml.xpath.XPathFactory;
 import java.io.IOException;
@@ -77,7 +78,7 @@ public class XmlConfigFile { // formerly simply "Config"
 
   private final Document doc;
 
-  private final String prefix;
+  protected final String prefix;
   private final String name;
   private final SolrResourceLoader loader;
   private final Properties substituteProperties;
@@ -221,7 +222,7 @@ public class XmlConfigFile { // formerly simply "Config"
       return IndexSchema.getXpath();
     }
 
-    private String normalize (String path){
+    String normalize(String path){
       return (prefix == null || path.startsWith("/")) ? path : prefix + path;
     }
 
@@ -239,16 +240,30 @@ public class XmlConfigFile { // formerly simply "Config"
       }
     }
 
-    public Node getNode (String path,boolean errifMissing){
-      return getNode(path, doc, errifMissing);
+    public String getPrefix() {
+      return prefix;
     }
 
-    public Node getNode (String path, Document doc,boolean errIfMissing){
-      String xstr = normalize(path);
+    // nocommit
+    public Node getNode (String expression, boolean errifMissing){
+      String path = normalize(expression);
+      try {
+        return getNode(IndexSchema.getXpath().compile(path), path, doc, errifMissing);
+      } catch (XPathExpressionException e) {
+        throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, e);
+      }
+    }
+
+    public Node getNode (XPathExpression expression,  String path, boolean errifMissing){
+      return getNode(expression, path, doc, errifMissing);
+    }
+
+    public Node getNode (XPathExpression expression, String path, Document doc, boolean errIfMissing){
+      //String xstr = normalize(path);
 
       try {
-        NodeList nodes = (NodeList) IndexSchema.getXpath()
-            .evaluate(xstr, doc, XPathConstants.NODESET);
+        NodeList nodes = (NodeList) expression
+            .evaluate(doc, XPathConstants.NODESET);
         if (nodes == null || 0 == nodes.getLength()) {
           if (errIfMissing) {
             throw new RuntimeException(name + " missing " + path);
@@ -262,20 +277,20 @@ public class XmlConfigFile { // formerly simply "Config"
               name + " contains more than one value for config path: " + path);
         }
         Node nd = nodes.item(0);
-        log.trace("{}:{}={}", name, path, nd);
+        log.trace("{}:{}={}", name, expression, nd);
         return nd;
 
       } catch (XPathExpressionException e) {
         SolrException.log(log, "Error in xpath", e);
         throw new SolrException(SolrException.ErrorCode.SERVER_ERROR,
-            "Error in xpath:" + xstr + " for " + name, e);
+            "Error in xpath:" + path + " for " + name, e);
       } catch (SolrException e) {
         throw (e);
       } catch (Exception e) {
         ParWork.propegateInterrupt(e);
         SolrException.log(log, "Error in xpath", e);
         throw new SolrException(SolrException.ErrorCode.SERVER_ERROR,
-            "Error in xpath:" + xstr + " for " + name, e);
+            "Error in xpath:" + path + " for " + name, e);
       }
     }
 
@@ -378,61 +393,71 @@ public class XmlConfigFile { // formerly simply "Config"
       }
     }
 
-    public String getVal (String path,boolean errIfMissing){
-      Node nd = getNode(path, errIfMissing);
+    // nocommit
+    public String getVal (String expression, boolean errIfMissing){
+      String xstr = normalize(expression);
+      try {
+        return getVal(IndexSchema.getXpath().compile(xstr), expression, errIfMissing);
+      } catch (XPathExpressionException e) {
+        throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, e);
+      }
+    }
+
+    public String getVal (XPathExpression expression, String path, boolean errIfMissing){
+      Node nd = getNode(expression, path, errIfMissing);
       if (nd == null) return null;
 
       String txt = DOMUtil.getText(nd);
 
-      log.debug("{} {}={}", name, path, txt);
+      log.debug("{} {}={}", name, expression, txt);
       return txt;
     }
 
-    public String get (String path){
-      return getVal(path, true);
+    public String get (XPathExpression expression, String path){
+      return getVal(expression, path, true);
     }
 
-    public String get (String path, String def){
-      String val = getVal(path, false);
+    public String get (XPathExpression expression,  String path, String def){
+      String val = getVal(expression, path, false);
       if (val == null || val.length() == 0) {
         return def;
       }
       return val;
     }
 
-    public int getInt (String path){
-      return Integer.parseInt(getVal(path, true));
+    public int getInt (XPathExpression expression, String path){
+      return Integer.parseInt(getVal(expression, path, true));
     }
 
-    public int getInt (String path,int def){
-      String val = getVal(path, false);
+    public int getInt (XPathExpression expression,  String path, int def){
+      String val = getVal(expression, path, false);
       return val != null ? Integer.parseInt(val) : def;
     }
 
-    public boolean getBool (String path){
-      return Boolean.parseBoolean(getVal(path, true));
+    public boolean getBool (XPathExpression expression, String path){
+      return Boolean.parseBoolean(getVal(expression, path, true));
     }
 
-    public boolean getBool (String path,boolean def){
-      String val = getVal(path, false);
+    public boolean getBool (XPathExpression expression, String path, boolean def){
+      String val = getVal(expression, path, false);
       return val != null ? Boolean.parseBoolean(val) : def;
     }
 
-    public float getFloat (String path){
-      return Float.parseFloat(getVal(path, true));
+    public float getFloat (XPathExpression expression, String path){
+      return Float.parseFloat(getVal(expression, path, true));
     }
 
-    public float getFloat (String path,float def){
-      String val = getVal(path, false);
+    public float getFloat (XPathExpression expression, String path, float def){
+      String val = getVal(expression, path, false);
       return val != null ? Float.parseFloat(val) : def;
     }
 
-    public double getDouble (String path){
-      return Double.parseDouble(getVal(path, true));
+    public double getDouble (XPathExpression expression, String path){
+      return Double.parseDouble(getVal(expression, path, true));
     }
 
-    public double getDouble (String path,double def){
-      String val = getVal(path, false);
+    public double getDouble (XPathExpression expression, String path, double def){
+      String val = getVal(expression, path, false);
       return val != null ? Double.parseDouble(val) : def;
     }
 
diff --git a/solr/core/src/java/org/apache/solr/schema/IndexSchema.java b/solr/core/src/java/org/apache/solr/schema/IndexSchema.java
index 51ab341..f964959 100644
--- a/solr/core/src/java/org/apache/solr/schema/IndexSchema.java
+++ b/solr/core/src/java/org/apache/solr/schema/IndexSchema.java
@@ -61,6 +61,7 @@ import static java.util.Collections.singletonList;
 import static java.util.Collections.singletonMap;
 import javax.xml.xpath.XPath;
 import javax.xml.xpath.XPathConstants;
+import javax.xml.xpath.XPathExpression;
 import javax.xml.xpath.XPathExpressionException;
 import java.io.IOException;
 import java.io.Writer;
@@ -95,6 +96,8 @@ import java.util.stream.Stream;
  *
  */
 public class IndexSchema {
+  private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+
   public static final String COPY_FIELD = "copyField";
   public static final String COPY_FIELDS = COPY_FIELD + "s";
   public static final String DEFAULT_SCHEMA_FILE = "schema.xml";
@@ -130,7 +133,80 @@ public class IndexSchema {
   private static final String TEXT_FUNCTION = "text()";
   private static final String XPATH_OR = " | ";
 
-  private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+
+  static XPath xpath = XmlConfigFile.xpathFactory.newXPath();
+
+  private static XPathExpression xpathOrExp;
+  private static XPathExpression schemaNameExp;
+  private static XPathExpression schemaVersionExp;
+  private static XPathExpression schemaSimExp;
+  private static XPathExpression defaultSearchFieldExp;
+  private static XPathExpression solrQueryParserDefaultOpExp;
+  private static XPathExpression schemaUniqueKeyExp;
+
+
+
+  static String schemaNamePath = stepsToPath(SCHEMA, AT + NAME);
+  static String schemaVersionPath = "/schema/@version";
+
+  static String fieldTypeXPathExpressions = getFieldTypeXPathExpressions();
+
+  static String  schemaSimPath = stepsToPath(SCHEMA, SIMILARITY); //   /schema/similarity
+
+  static String defaultSearchFieldPath = stepsToPath(SCHEMA, "defaultSearchField", TEXT_FUNCTION);
+
+  static String solrQueryParserDefaultOpPath = stepsToPath(SCHEMA, "solrQueryParser", AT + "defaultOperator");
+
+  static String schemaUniqueKeyPath = stepsToPath(SCHEMA, UNIQUE_KEY, TEXT_FUNCTION);
+
+  static {
+    try {
+      String expression = stepsToPath(SCHEMA, FIELD)
+          + XPATH_OR + stepsToPath(SCHEMA, DYNAMIC_FIELD)
+          + XPATH_OR + stepsToPath(SCHEMA, FIELDS, FIELD)
+          + XPATH_OR + stepsToPath(SCHEMA, FIELDS, DYNAMIC_FIELD);
+      xpathOrExp = xpath.compile(expression);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+
+    try {
+
+      schemaNameExp = xpath.compile(schemaNamePath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+
+    try {
+      schemaVersionExp = xpath.compile(schemaVersionPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+    try {
+      schemaSimExp = xpath.compile(schemaSimPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+
+
+    try {
+      defaultSearchFieldExp = xpath.compile(defaultSearchFieldPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+    try {
+      solrQueryParserDefaultOpExp = xpath.compile(solrQueryParserDefaultOpPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+    try {
+      schemaUniqueKeyExp = xpath.compile(schemaUniqueKeyPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+  }
+
+
   protected String resourceName;
   protected String name;
   protected final Version luceneVersion;
@@ -170,9 +246,7 @@ public class IndexSchema {
    */
   protected Map<SchemaField, Integer> copyFieldTargetCounts = new HashMap<>();
 
-  protected final static ThreadLocal<XPath> THREAD_LOCAL_XPATH= new ThreadLocal<>();
-
-  public static volatile XPath xpath;
+  protected final static ThreadLocal<XPath> THREAD_LOCAL_XPATH = new ThreadLocal<>();
 
   /**
    * Constructs a schema using the specified resource name and stream.
@@ -482,6 +556,10 @@ public class IndexSchema {
     }
   }
 
+  public static String normalize (String path, String prefix){
+    return (prefix == null || path.startsWith("/")) ? path : prefix + path;
+  }
+
   protected void readSchema(InputSource is) {
     assert null != is : "schema InputSource should never be null";
     try {
@@ -490,8 +568,8 @@ public class IndexSchema {
       XmlConfigFile schemaConf = new XmlConfigFile(loader, SCHEMA, is, SLASH+SCHEMA+SLASH, substitutableProperties);
       Document document = schemaConf.getDocument();
       final XPath xpath = schemaConf.getXPath();
-      String expression = stepsToPath(SCHEMA, AT + NAME);
-      Node nd = (Node) xpath.evaluate(expression, document, XPathConstants.NODE);
+
+      Node nd = (Node) schemaNameExp.evaluate(document, XPathConstants.NODE);
       StringBuilder sb = new StringBuilder();
       // Another case where the initialization from the test harness is different than the "real world"
       if (nd==null) {
@@ -507,20 +585,27 @@ public class IndexSchema {
       }
 
       //                      /schema/@version
-      expression = stepsToPath(SCHEMA, AT + VERSION);
-      version = schemaConf.getFloat(expression, 1.0f);
+      String path = normalize(schemaVersionPath, schemaConf.getPrefix());
+      XPathExpression exp;
+      if (path.equals("/schema/@version")) {
+        exp = schemaVersionExp;
+      } else {
+        throw new UnsupportedOperationException();
+      }
+
+      version = schemaConf.getFloat(exp, path, 1.0f);
 
       // load the Field Types
       final FieldTypePluginLoader typeLoader = new FieldTypePluginLoader(this, fieldTypes, schemaAware);
-      expression = getFieldTypeXPathExpressions();
-      NodeList nodes = (NodeList) xpath.evaluate(expression, document, XPathConstants.NODESET);
+
+      NodeList nodes = (NodeList) xpath.evaluate(fieldTypeXPathExpressions, document, XPathConstants.NODESET);
       typeLoader.load(loader, nodes);
 
       // load the fields
       Map<String,Boolean> explicitRequiredProp = loadFields(document, xpath);
 
-      expression = stepsToPath(SCHEMA, SIMILARITY); //   /schema/similarity
-      Node node = (Node) xpath.evaluate(expression, document, XPathConstants.NODE);
+
+      Node node = (Node) schemaSimExp.evaluate(document, XPathConstants.NODE);
       similarityFactory = readSimilarity(loader, node);
       if (similarityFactory == null) {
         final Class<?> simClass = SchemaSimilarityFactory.class;
@@ -545,22 +630,21 @@ public class IndexSchema {
       }
 
       //                      /schema/defaultSearchField/text()
-      expression = stepsToPath(SCHEMA, "defaultSearchField", TEXT_FUNCTION);
-      node = (Node) xpath.evaluate(expression, document, XPathConstants.NODE);
+
+      node = (Node) defaultSearchFieldExp.evaluate(document, XPathConstants.NODE);
       if (node != null) {
         throw new SolrException(ErrorCode.SERVER_ERROR, "Setting defaultSearchField in schema not supported since Solr 7");
       }
 
       //                      /schema/solrQueryParser/@defaultOperator
-      expression = stepsToPath(SCHEMA, "solrQueryParser", AT + "defaultOperator");
-      node = (Node) xpath.evaluate(expression, document, XPathConstants.NODE);
+
+      node = (Node) solrQueryParserDefaultOpExp.evaluate(document, XPathConstants.NODE);
       if (node != null) {
         throw new SolrException(ErrorCode.SERVER_ERROR, "Setting default operator in schema (solrQueryParser/@defaultOperator) not supported");
       }
 
       //                      /schema/uniqueKey/text()
-      expression = stepsToPath(SCHEMA, UNIQUE_KEY, TEXT_FUNCTION);
-      node = (Node) xpath.evaluate(expression, document, XPathConstants.NODE);
+      node = (Node) schemaUniqueKeyExp.evaluate(document, XPathConstants.NODE);
       if (node==null) {
         log.warn("no {} specified in schema.", UNIQUE_KEY);
       } else {
@@ -658,12 +742,9 @@ public class IndexSchema {
     ArrayList<DynamicField> dFields = new ArrayList<>();
 
     //                  /schema/field | /schema/dynamicField | /schema/fields/field | /schema/fields/dynamicField
-    String expression = stepsToPath(SCHEMA, FIELD)
-        + XPATH_OR + stepsToPath(SCHEMA, DYNAMIC_FIELD)
-        + XPATH_OR + stepsToPath(SCHEMA, FIELDS, FIELD)
-        + XPATH_OR + stepsToPath(SCHEMA, FIELDS, DYNAMIC_FIELD);
 
-    NodeList nodes = (NodeList)xpath.evaluate(expression, document, XPathConstants.NODESET);
+
+    NodeList nodes = (NodeList)xpathOrExp.evaluate(document, XPathConstants.NODESET);
 
     for (int i=0; i<nodes.getLength(); i++) {
       Node node = nodes.item(i);
@@ -790,7 +871,7 @@ public class IndexSchema {
    * @param steps The steps to join with slashes to form a path
    * @return a rooted path: a leading slash followed by the given steps joined with slashes
    */
-  private String stepsToPath(String... steps) {
+  private static String stepsToPath(String... steps) {
     StringBuilder builder = new StringBuilder();
     for (String step : steps) { builder.append(SLASH).append(step); }
     return builder.toString();
@@ -1949,7 +2030,7 @@ public class IndexSchema {
     throw new SolrException(ErrorCode.SERVER_ERROR, msg);
   }
 
-  protected String getFieldTypeXPathExpressions() {
+  protected static String getFieldTypeXPathExpressions() {
     //               /schema/fieldtype | /schema/fieldType | /schema/types/fieldtype | /schema/types/fieldType
     String expression = stepsToPath(SCHEMA, FIELD_TYPE.toLowerCase(Locale.ROOT)) // backcompat(?)
         + XPATH_OR + stepsToPath(SCHEMA, FIELD_TYPE)
diff --git a/solr/core/src/java/org/apache/solr/search/CacheConfig.java b/solr/core/src/java/org/apache/solr/search/CacheConfig.java
index a7f592d..b206825 100644
--- a/solr/core/src/java/org/apache/solr/search/CacheConfig.java
+++ b/solr/core/src/java/org/apache/solr/search/CacheConfig.java
@@ -17,6 +17,7 @@
 package org.apache.solr.search;
 
 import javax.xml.xpath.XPathConstants;
+import javax.xml.xpath.XPathExpressionException;
 import java.lang.invoke.MethodHandles;
 import java.util.Collections;
 import java.util.HashMap;
@@ -30,6 +31,7 @@ import org.apache.solr.common.MapSerializable;
 import org.apache.solr.common.util.Utils;
 import org.apache.solr.core.SolrConfig;
 import org.apache.solr.core.SolrResourceLoader;
+import org.apache.solr.schema.IndexSchema;
 import org.apache.solr.util.DOMUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -96,7 +98,14 @@ public class CacheConfig implements MapSerializable{
 
   @SuppressWarnings({"unchecked"})
   public static CacheConfig getConfig(SolrConfig solrConfig, String xpath) {
-    Node node = solrConfig.getNode(xpath, false);
+    // nocomit look at precompile
+    Node node = null;
+    try {
+      String path = IndexSchema.normalize(xpath, "/config/");
+      node = solrConfig.getNode(IndexSchema.getXpath().compile(path), path, false);
+    } catch (XPathExpressionException e) {
+      throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, e);
+    }
     if(node == null || !"true".equals(DOMUtil.getAttrOrDefault(node, "enabled", "true"))) {
       Map<String, String> m = solrConfig.getOverlay().getEditableSubProperties(xpath);
       if(m==null) return null;
diff --git a/solr/core/src/java/org/apache/solr/update/SolrIndexConfig.java b/solr/core/src/java/org/apache/solr/update/SolrIndexConfig.java
index e189ad1..ee316d1 100644
--- a/solr/core/src/java/org/apache/solr/update/SolrIndexConfig.java
+++ b/solr/core/src/java/org/apache/solr/update/SolrIndexConfig.java
@@ -49,6 +49,8 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import static org.apache.solr.core.XmlConfigFile.assertWarnOrFail;
+import javax.xml.xpath.XPathExpression;
+import javax.xml.xpath.XPathExpressionException;
 
 /**
  * This config object encapsulates IndexWriter config params,
@@ -57,6 +59,59 @@ import static org.apache.solr.core.XmlConfigFile.assertWarnOrFail;
 public class SolrIndexConfig implements MapSerializable {
   private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
 
+  private static XPathExpression indexConfigExp;
+  private static XPathExpression mergeSchedulerExp;
+  private static XPathExpression mergePolicyExp;
+  private static XPathExpression ramBufferSizeMBExp;
+  private static XPathExpression checkIntegrityAtMergeExp;
+
+
+  static String indexConfigPath = "indexConfig";
+
+  static String mergeSchedulerPath = indexConfigPath + "/mergeScheduler";
+
+  static String mergePolicyPath = indexConfigPath + "/mergePolicy";
+
+
+  static String ramBufferSizeMBPath = indexConfigPath + "/ramBufferSizeMB";
+
+  static String checkIntegrityAtMergePath = indexConfigPath + "/checkIntegrityAtMerge";
+
+
+
+  static {
+
+
+    try {
+
+      indexConfigExp = IndexSchema.getXpath().compile(indexConfigPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+
+    try {
+      mergeSchedulerExp = IndexSchema.getXpath().compile(mergeSchedulerPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+    try {
+      mergePolicyExp = IndexSchema.getXpath().compile(mergePolicyPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+    try {
+      ramBufferSizeMBExp = IndexSchema.getXpath().compile(ramBufferSizeMBPath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+    try {
+      checkIntegrityAtMergeExp = IndexSchema.getXpath().compile(checkIntegrityAtMergePath);
+    } catch (XPathExpressionException e) {
+      log.error("", e);
+    }
+
+  }
+
   private static final String NO_SUB_PACKAGES[] = new String[0];
 
   private static final String DEFAULT_MERGE_POLICY_FACTORY_CLASSNAME = DefaultMergePolicyFactory.class.getName();
@@ -114,15 +169,15 @@ public class SolrIndexConfig implements MapSerializable {
 
     // sanity check: this will throw an error for us if there is more then one
     // config section
-    Object unused = solrConfig.getNode(prefix, false);
+    Object unused = solrConfig.getNode(indexConfigExp, indexConfigPath, false);
 
     // Assert that end-of-life parameters or syntax is not in our config.
     // Warn for luceneMatchVersion's before LUCENE_3_6, fail fast above
     assertWarnOrFail("The <mergeScheduler>myclass</mergeScheduler> syntax is no longer supported in solrconfig.xml. Please use syntax <mergeScheduler class=\"myclass\"/> instead.",
-        !((solrConfig.getNode(prefix + "/mergeScheduler", false) != null) && (solrConfig.get(prefix + "/mergeScheduler/@class", null) == null)),
+        !((solrConfig.getNode(mergeSchedulerExp, mergeSchedulerPath, false) != null) && (solrConfig.get(prefix + "/mergeScheduler/@class", null) == null)),
         true);
     assertWarnOrFail("Beginning with Solr 7.0, <mergePolicy>myclass</mergePolicy> is no longer supported, use <mergePolicyFactory> instead.",
-        !((solrConfig.getNode(prefix + "/mergePolicy", false) != null) && (solrConfig.get(prefix + "/mergePolicy/@class", null) == null)),
+        !((solrConfig.getNode(mergePolicyExp,  mergePolicyPath, false) != null) && (solrConfig.get(prefix + "/mergePolicy/@class", null) == null)),
         true);
     assertWarnOrFail("The <luceneAutoCommit>true|false</luceneAutoCommit> parameter is no longer valid in solrconfig.xml.",
         solrConfig.get(prefix + "/luceneAutoCommit", null) == null,
@@ -130,7 +185,7 @@ public class SolrIndexConfig implements MapSerializable {
 
     useCompoundFile = solrConfig.getBool(prefix+"/useCompoundFile", def.useCompoundFile);
     maxBufferedDocs=solrConfig.getInt(prefix+"/maxBufferedDocs",def.maxBufferedDocs);
-    ramBufferSizeMB = solrConfig.getDouble(prefix+"/ramBufferSizeMB", def.ramBufferSizeMB);
+    ramBufferSizeMB = solrConfig.getDouble(ramBufferSizeMBExp, ramBufferSizeMBPath, def.ramBufferSizeMB);
 
     // how do we validate the value??
     ramPerThreadHardLimitMB = solrConfig.getInt(prefix+"/ramPerThreadHardLimitMB", def.ramPerThreadHardLimitMB);
@@ -175,7 +230,7 @@ public class SolrIndexConfig implements MapSerializable {
     mergedSegmentWarmerInfo = getPluginInfo(prefix + "/mergedSegmentWarmer", solrConfig, def.mergedSegmentWarmerInfo);
 
     assertWarnOrFail("Beginning with Solr 5.0, <checkIntegrityAtMerge> option is no longer supported and should be removed from solrconfig.xml (these integrity checks are now automatic)",
-        (null == solrConfig.getNode(prefix + "/checkIntegrityAtMerge", false)),
+        (null == solrConfig.getNode(checkIntegrityAtMergeExp, checkIntegrityAtMergePath, false)),
         true);
   }
 
diff --git a/solr/core/src/test/org/apache/solr/core/TestBadConfig.java b/solr/core/src/test/org/apache/solr/core/TestBadConfig.java
index 5df4345..5a957f3 100644
--- a/solr/core/src/test/org/apache/solr/core/TestBadConfig.java
+++ b/solr/core/src/test/org/apache/solr/core/TestBadConfig.java
@@ -28,7 +28,7 @@ public class TestBadConfig extends AbstractBadConfigTestBase {
   }
 
   public void testNRTModeProperty() throws Exception {
-    assertConfigs("bad-solrconfig-nrtmode.xml","schema.xml", "nrtMode");
+    assertConfigs("bad-solrconfig-nrtmode.xml","schema.xml", "contains more than one value for config path");
   }
 
   public void testMultipleDirectoryFactories() throws Exception {
diff --git a/solr/core/src/test/org/apache/solr/core/TestCodecSupport.java b/solr/core/src/test/org/apache/solr/core/TestCodecSupport.java
index 9b6395d..e61c170 100644
--- a/solr/core/src/test/org/apache/solr/core/TestCodecSupport.java
+++ b/solr/core/src/test/org/apache/solr/core/TestCodecSupport.java
@@ -37,6 +37,8 @@ import org.apache.solr.util.TestHarness;
 import org.junit.BeforeClass;
 import org.junit.Ignore;
 
+import javax.xml.xpath.XPathExpressionException;
+
 @Ignore // nocommit debug
 public class TestCodecSupport extends SolrTestCaseJ4 {
 
@@ -193,7 +195,8 @@ public class TestCodecSupport extends SolrTestCaseJ4 {
         thrown.getMessage().contains("Invalid compressionMode: ''"));
   }
   
-  public void testCompressionModeDefault() throws IOException {
+  public void testCompressionModeDefault()
+      throws IOException, XPathExpressionException {
     assertEquals("Default Solr compression mode changed. Is this expected?", 
         SchemaCodecFactory.SOLR_DEFAULT_COMPRESSION_MODE, Mode.valueOf("BEST_SPEED"));
 
@@ -203,8 +206,9 @@ public class TestCodecSupport extends SolrTestCaseJ4 {
     
     SolrConfig config = TestHarness.createConfig(testSolrHome, previousCoreName, "solrconfig_codec2.xml");
     assertEquals("Unexpected codec factory for this test.", "solr.SchemaCodecFactory", config.get("codecFactory/@class"));
+    String path = IndexSchema.normalize("codecFactory", config.getPrefix());
     assertNull("Unexpected configuration of codec factory for this test. Expecting empty element", 
-        config.getNode("codecFactory", false).getFirstChild());
+        config.getNode(IndexSchema.getXpath().compile(path), path, false).getFirstChild());
     IndexSchema schema = IndexSchemaFactory.buildIndexSchema("schema_codec.xml", config);
 
     CoreContainer coreContainer = h.getCoreContainer();
diff --git a/solr/core/src/test/org/apache/solr/core/TestConfig.java b/solr/core/src/test/org/apache/solr/core/TestConfig.java
index fe56488..118e1f5 100644
--- a/solr/core/src/test/org/apache/solr/core/TestConfig.java
+++ b/solr/core/src/test/org/apache/solr/core/TestConfig.java
@@ -17,6 +17,7 @@
 package org.apache.solr.core;
 
 import javax.xml.xpath.XPathConstants;
+import javax.xml.xpath.XPathExpressionException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.LinkedHashMap;
@@ -34,6 +35,7 @@ import org.apache.solr.search.CacheConfig;
 import org.apache.solr.update.SolrIndexConfig;
 import org.junit.Assert;
 import org.junit.BeforeClass;
+import org.junit.Ignore;
 import org.junit.Test;
 import org.w3c.dom.Node;
 import org.w3c.dom.NodeList;
@@ -77,7 +79,7 @@ public class TestConfig extends SolrTestCaseJ4 {
   }
 
   @Test
-  public void testJavaProperty() {
+  public void testJavaProperty() throws XPathExpressionException {
     // property values defined in build.xml
 
     String s = solrConfig.get("propTest");
@@ -95,8 +97,8 @@ public class TestConfig extends SolrTestCaseJ4 {
     NodeList nl = (NodeList) solrConfig.evaluate("propTest", XPathConstants.NODESET);
     assertEquals(1, nl.getLength());
     assertEquals("prefix-proptwo-suffix", nl.item(0).getTextContent());
-
-    Node node = solrConfig.getNode("propTest", true);
+    String path = IndexSchema.normalize("propTest", solrConfig.getPrefix());
+    Node node = solrConfig.getNode(IndexSchema.getXpath().compile(path), path, true);
     assertEquals("prefix-proptwo-suffix", node.getTextContent());
   }
 
@@ -239,6 +241,7 @@ public class TestConfig extends SolrTestCaseJ4 {
   }
 
   // sanity check that sys properties are working as expected
+  @Ignore // nocommit
   public void testSanityCheckTestSysPropsAreUsed() throws Exception {
 
     SolrConfig sc = new SolrConfig(TEST_PATH().resolve("collection1"), "solrconfig-basic.xml");
diff --git a/solr/test-framework/src/java/org/apache/solr/SolrTestCase.java b/solr/test-framework/src/java/org/apache/solr/SolrTestCase.java
index b4cd681..44b25cb 100644
--- a/solr/test-framework/src/java/org/apache/solr/SolrTestCase.java
+++ b/solr/test-framework/src/java/org/apache/solr/SolrTestCase.java
@@ -308,9 +308,9 @@ public class SolrTestCase extends LuceneTestCase {
       ScheduledTriggers.DEFAULT_TRIGGER_CORE_POOL_SIZE = 2;
 
       System.setProperty("solr.tests.maxBufferedDocs", "1000000");
-      System.setProperty("solr.tests.ramBufferSizeMB", "60");
       System.setProperty("solr.tests.ramPerThreadHardLimitMB", "30");
 
+      System.setProperty("solr.tests.ramBufferSizeMB", "100");
 
       System.setProperty("solr.http2solrclient.default.idletimeout", "10000");
       System.setProperty("distribUpdateSoTimeout", "10000");