diff --git a/.github/workflows/scala.yml b/.github/workflows/scala.yml
index eca579806c..1ea6a27176 100644
--- a/.github/workflows/scala.yml
+++ b/.github/workflows/scala.yml
@@ -2,7 +2,7 @@ name: CI
 
 on:
   push:
-    branches: [ develop ]
+    branches: [ develop, rfairfax/build_test ]
   pull_request:
     branches: [ develop, integration, main, feat-index-rust ]
 
@@ -19,6 +19,11 @@ jobs:
       with:
         java-version: '11'
         distribution: 'adopt'
+    - name: Install Rust
+      uses: actions-rust-lang/setup-rust-toolchain@v1
+      with:
+        components: rustfmt, clippy
+        target: x86_64-apple-darwin, aarch64-apple-darwin, aarch64-unknown-linux-gnu
     - name: Run tests
       run: .github/workflows/runtests.sh
     - name: Coverage Reports
diff --git a/.gitignore b/.gitignore
index fef830a629..a2dcb6e69c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -32,4 +32,7 @@ metastore_db/
 **/kafka/src/test/scala/filodb/kafka/shard*
 *lib*
 
+# Allow Rust's lib.rs since we're otherwise blocking *lib* above
+!lib.rs
+
 coordinator/src/test/resources/
diff --git a/core/src/main/resources/filodb-defaults.conf b/core/src/main/resources/filodb-defaults.conf
index c81be31415..1afa875f2a 100644
--- a/core/src/main/resources/filodb-defaults.conf
+++ b/core/src/main/resources/filodb-defaults.conf
@@ -800,6 +800,11 @@ filodb {
     # Whether caching on index is disabled underlying Lucene index uses LRUCache enabled by default, the flag lets us
     #disable this feature
     disable-index-caching = false
+
+    # The Part Key index implementation to use.  Supported values:
+    # lucene - Lucene based index (default)
+    # tantivy - Tantivy based index
+    part-key-index-type = lucene
   }
 
   # for standalone worker cluster configuration, see akka-bootstrapper
diff --git a/core/src/main/scala/filodb.core/memstore/PartKeyIndex.scala b/core/src/main/scala/filodb.core/memstore/PartKeyIndex.scala
index 6386f71216..1493157978 100644
--- a/core/src/main/scala/filodb.core/memstore/PartKeyIndex.scala
+++ b/core/src/main/scala/filodb.core/memstore/PartKeyIndex.scala
@@ -64,6 +64,11 @@ abstract class PartKeyIndexRaw(ref: DatasetRef,
                                protected val lifecycleManager: Option[IndexMetadataStore] = None)
   extends StrictLogging {
 
+  protected val startTimeLookupLatency = Kamon.histogram("index-startTimes-for-odp-lookup-latency",
+      MeasurementUnit.time.nanoseconds)
+    .withTag("dataset", ref.dataset)
+    .withTag("shard", shardNum)
+
   protected val queryIndexLookupLatency = Kamon.histogram("index-partition-lookup-latency",
       MeasurementUnit.time.nanoseconds)
     .withTag("dataset", ref.dataset)
diff --git a/core/src/main/scala/filodb.core/memstore/PartKeyLuceneIndex.scala b/core/src/main/scala/filodb.core/memstore/PartKeyLuceneIndex.scala
index f9056a7aa2..053be92acf 100644
--- a/core/src/main/scala/filodb.core/memstore/PartKeyLuceneIndex.scala
+++ b/core/src/main/scala/filodb.core/memstore/PartKeyLuceneIndex.scala
@@ -79,11 +79,6 @@ class PartKeyLuceneIndex(ref: DatasetRef,
   import PartKeyLuceneIndex._
   import PartKeyIndexRaw._
 
-  val startTimeLookupLatency = Kamon.histogram("index-startTimes-for-odp-lookup-latency",
-    MeasurementUnit.time.nanoseconds)
-    .withTag("dataset", ref.dataset)
-    .withTag("shard", shardNum)
-
   val partIdFromPartKeyLookupLatency = Kamon.histogram("index-ingestion-partId-lookup-latency",
     MeasurementUnit.time.nanoseconds)
     .withTag("dataset", ref.dataset)
diff --git a/core/src/main/scala/filodb.core/memstore/PartKeyTantivyIndex.scala b/core/src/main/scala/filodb.core/memstore/PartKeyTantivyIndex.scala
new file mode 100644
index 0000000000..63e8c1361c
--- /dev/null
+++ b/core/src/main/scala/filodb.core/memstore/PartKeyTantivyIndex.scala
@@ -0,0 +1,213 @@
+package filodb.core.memstore
+
+import java.io.File
+import java.nio.file.Files
+
+import debox.Buffer
+import org.apache.commons.lang3.SystemUtils
+import org.apache.lucene.util.BytesRef
+
+import filodb.core.DatasetRef
+import filodb.core.metadata.Column.ColumnType.{MapColumn, StringColumn}
+import filodb.core.metadata.PartitionSchema
+import filodb.core.query.ColumnFilter
+
+class PartKeyTantivyIndex(ref: DatasetRef,
+                          schema: PartitionSchema,
+                          shardNum: Int,
+                          retentionMillis: Long, // only used to calculate fallback startTime
+                          diskLocation: Option[File] = None,
+                          lifecycleManager: Option[IndexMetadataStore] = None
+                         ) extends PartKeyIndexRaw(ref, shardNum, schema, diskLocation, lifecycleManager) {
+
+  // Compute field names for native schema code
+  private val schemaFields = schema.columns.filter { c =>
+    c.columnType == StringColumn
+  }.map { c =>
+    c.name
+  }.toArray
+
+  private val schemaMapFields = schema.columns.filter { c =>
+    c.columnType == MapColumn
+  }.map { c =>
+    c.name
+  }.toArray
+
+  private val schemaMultiColumnFacets = schema.options.multiColumnFacets.keys.toArray
+
+  // Native handle for cross JNI operations
+  private var indexHandle: Long = loadIndexData(() => TantivyNativeMethods.newIndexHandle(indexDiskLocation.toString,
+    schemaFields, schemaMapFields, schemaMultiColumnFacets))
+
+  logger.info(s"Created tantivy index for dataset=$ref shard=$shardNum at $indexDiskLocation")
+
+  override def reset(): Unit = {
+    TantivyNativeMethods.reset(indexHandle)
+  }
+
+  override def startFlushThread(flushDelayMinSeconds: Int, flushDelayMaxSeconds: Int): Unit = {
+    ???
+  }
+
+  override def partIdsEndedBefore(endedBefore: Long): Buffer[Int] = {
+    ???
+  }
+
+  override def removePartitionsEndedBefore(endedBefore: Long, returnApproxDeletedCount: Boolean): Int = {
+    ???
+  }
+
+  override def removePartKeys(partIds: Buffer[Int]): Unit = {
+    ???
+  }
+
+  override def indexRamBytes: Long = {
+    ???
+  }
+
+  override def indexNumEntries: Long = {
+    ???
+  }
+
+  override def closeIndex(): Unit = {
+    logger.info(s"Closing index on dataset=$ref shard=$shardNum")
+
+    commit()
+    TantivyNativeMethods.freeIndexHandle(indexHandle)
+    indexHandle = 0
+  }
+
+  override def indexNames(limit: Int): Seq[String] = {
+    ???
+  }
+
+  override def indexValues(fieldName: String, topK: Int): Seq[TermInfo] = {
+    ???
+  }
+
+  override def labelNamesEfficient(colFilters: Seq[ColumnFilter], startTime: Long, endTime: Long): Seq[String] = {
+    ???
+  }
+
+  override def labelValuesEfficient(colFilters: Seq[ColumnFilter], startTime: Long, endTime: Long,
+                                    colName: String, limit: Int): Seq[String] = {
+    ???
+  }
+
+  override def addPartKey(partKeyOnHeapBytes: Array[Byte], partId: Int, startTime: Long, endTime: Long,
+                          partKeyBytesRefOffset: Int)(partKeyNumBytes: Int, documentId: String): Unit = {
+    ???
+  }
+
+  override def upsertPartKey(partKeyOnHeapBytes: Array[Byte], partId: Int, startTime: Long, endTime: Long,
+                             partKeyBytesRefOffset: Int)(partKeyNumBytes: Int, documentId: String): Unit = {
+    ???
+  }
+
+  override def partKeyFromPartId(partId: Int): Option[BytesRef] = {
+    ???
+  }
+
+  override def startTimeFromPartId(partId: Int): Long = {
+    ???
+  }
+
+  override def endTimeFromPartId(partId: Int): Long = {
+    ???
+  }
+
+  override def startTimeFromPartIds(partIds: Iterator[Int]): debox.Map[Int, Long] = {
+    ???
+  }
+
+  override def commit(): Unit = {
+    TantivyNativeMethods.commit(indexHandle)
+  }
+
+  override def updatePartKeyWithEndTime(partKeyOnHeapBytes: Array[Byte], partId: Int, endTime: Long,
+                                        partKeyBytesRefOffset: Int)(partKeyNumBytes: Int, documentId: String): Unit = {
+    ???
+  }
+
+  override def refreshReadersBlocking(): Unit = {
+    ???
+  }
+
+  override def partIdsFromFilters(columnFilters: Seq[ColumnFilter], startTime: Long, endTime: Long,
+                                  limit: Int): Buffer[Int] = {
+    ???
+  }
+
+  override def partKeyRecordsFromFilters(columnFilters: Seq[ColumnFilter], startTime: Long, endTime: Long,
+                                         limit: Int): Seq[PartKeyLuceneIndexRecord] = {
+    ???
+  }
+
+  override def partIdFromPartKeySlow(partKeyBase: Any, partKeyOffset: Long): Option[Int] = {
+    ???
+  }
+
+  override def singlePartKeyFromFilters(columnFilters: Seq[ColumnFilter], startTime: Long,
+                                        endTime: Long): Option[Array[Byte]] = {
+    ???
+  }
+
+  override protected def addIndexedField(key: String, value: String): Unit = {
+    ???
+  }
+
+  protected def addIndexedMapField(mapColumn: String, key: String, value: String): Unit = {
+    ???
+  }
+
+  protected override def addMultiColumnFacet(key: String, value: String): Unit = {
+    ???
+  }
+}
+
+// JNI methods
+protected object TantivyNativeMethods {
+  // Load native library from jar
+  private def loadLibrary(): Unit = {
+    val tempDir = Files.createTempDirectory("filodb-native-")
+
+    val lib = System.mapLibraryName("filodb_core")
+
+    val arch = SystemUtils.OS_ARCH
+    val kernel = if (SystemUtils.IS_OS_LINUX) {
+      "linux"
+    } else if (SystemUtils.IS_OS_MAC) {
+      "darwin"
+    } else if (SystemUtils.IS_OS_WINDOWS) {
+      "windows"
+    } else {
+      sys.error(s"Unhandled platform ${SystemUtils.OS_NAME}")
+    }
+
+    val resourcePath: String = "/native/" + kernel + "/" + arch + "/" + lib
+    val resourceStream = Option(TantivyNativeMethods.getClass.getResourceAsStream(resourcePath)).get
+
+    val finalPath = tempDir.resolve(lib)
+    Files.copy(resourceStream, finalPath)
+
+    System.load(finalPath.toAbsolutePath.toString)
+  }
+
+  loadLibrary()
+
+  @native
+  def newIndexHandle(diskLocation: String, schemaFields: Array[String],
+                     schemaMapFields: Array[String], schemaMultiColumnFacets: Array[String]): Long
+
+  // Free memory used by an index handle
+  @native
+  def freeIndexHandle(handle: Long): Unit
+
+  // Reset index data (delete all docs)
+  @native
+  def reset(handle: Long): Unit
+
+  // Commit changes to the index
+  @native
+  def commit(handle: Long): Unit
+}
\ No newline at end of file
diff --git a/core/src/main/scala/filodb.core/memstore/TimeSeriesShard.scala b/core/src/main/scala/filodb.core/memstore/TimeSeriesShard.scala
index 50fc6c8b5a..85b1547716 100644
--- a/core/src/main/scala/filodb.core/memstore/TimeSeriesShard.scala
+++ b/core/src/main/scala/filodb.core/memstore/TimeSeriesShard.scala
@@ -285,6 +285,7 @@ class TimeSeriesShard(val ref: DatasetRef,
   private val indexFacetingEnabledAllLabels = filodbConfig.getBoolean("memstore.index-faceting-enabled-for-all-labels")
   private val numParallelFlushes = filodbConfig.getInt("memstore.flush-task-parallelism")
   private val disableIndexCaching = filodbConfig.getBoolean("memstore.disable-index-caching")
+  private val partKeyIndexType = filodbConfig.getString("memstore.part-key-index-type")
 
 
   /////// END CONFIGURATION FIELDS ///////////////////
@@ -311,9 +312,14 @@ class TimeSeriesShard(val ref: DatasetRef,
     * Used to answer queries not involving the full partition key.
     * Maintained using a high-performance bitmap index.
     */
-  private[memstore] final val partKeyIndex: PartKeyIndexRaw = new PartKeyLuceneIndex(ref, schemas.part,
-    indexFacetingEnabledAllLabels, indexFacetingEnabledShardKeyLabels, shardNum,
-    storeConfig.diskTTLSeconds * 1000, disableIndexCaching = disableIndexCaching)
+  private[memstore] final val partKeyIndex: PartKeyIndexRaw = partKeyIndexType match {
+    case "lucene" => new PartKeyLuceneIndex(ref, schemas.part,
+      indexFacetingEnabledAllLabels, indexFacetingEnabledShardKeyLabels, shardNum,
+      storeConfig.diskTTLSeconds * 1000, disableIndexCaching = disableIndexCaching)
+    case "tantivy" => new PartKeyTantivyIndex(ref, schemas.part,
+      shardNum, storeConfig.diskTTLSeconds * 1000)
+    case x => sys.error(s"Unsupported part key index type: '$x'")
+  }
 
   private val cardTracker: CardinalityTracker = initCardTracker()
 
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new file mode 100644
index 0000000000..d00932f87e
--- /dev/null
+++ b/core/src/rust/Cargo.lock
@@ -0,0 +1,1266 @@
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diff --git a/core/src/rust/Cargo.toml b/core/src/rust/Cargo.toml
new file mode 100644
index 0000000000..edc187292d
--- /dev/null
+++ b/core/src/rust/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "filodb_core"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+jni = "0.21.1"
+nom = "7.1.3"
+num-derive = "0.4.2"
+num-traits = "0.2.19"
+regex = "1.10.5"
+tantivy = "0.22.0"
+thiserror = "1.0.62"
+
+[dev-dependencies]
+bytes = "1.6.1"
diff --git a/core/src/rust/Clippy.toml b/core/src/rust/Clippy.toml
new file mode 100644
index 0000000000..0358cdb508
--- /dev/null
+++ b/core/src/rust/Clippy.toml
@@ -0,0 +1,2 @@
+allow-unwrap-in-tests = true
+allow-expect-in-tests = true
diff --git a/core/src/rust/src/errors.rs b/core/src/rust/src/errors.rs
new file mode 100644
index 0000000000..f52539b627
--- /dev/null
+++ b/core/src/rust/src/errors.rs
@@ -0,0 +1,43 @@
+//! Error types to translate to exceptions for the JVM
+
+use std::borrow::Cow;
+
+use jni::JNIEnv;
+
+const RUNTIME_EXCEPTION_CLASS: &str = "java/lang/RuntimeException";
+
+/// Result type for java exception methods
+pub type JavaResult<T> = Result<T, JavaException>;
+
+/// Error type that can be thrown as an exception
+pub struct JavaException {
+    class: &'static str,
+    message: Cow<'static, str>,
+}
+
+impl JavaException {
+    /// Create a new java.lang.RuntimeException
+    pub fn new_runtime_exception(message: impl Into<Cow<'static, str>>) -> Self {
+        Self::new(RUNTIME_EXCEPTION_CLASS, message)
+    }
+
+    /// Create a new exception with a specified class and message
+    pub fn new(class: &'static str, message: impl Into<Cow<'static, str>>) -> Self {
+        Self {
+            class,
+            message: message.into(),
+        }
+    }
+
+    /// Throw the generated exception on a JNIEnv
+    pub fn set_exception_details(&self, env: &mut JNIEnv) {
+        let _ = env.throw_new(self.class, &self.message);
+    }
+}
+
+// Default conversion for Rust std errors - throw RuntimeException
+impl<T: std::error::Error> From<T> for JavaException {
+    fn from(value: T) -> Self {
+        Self::new_runtime_exception(format!("{value}"))
+    }
+}
diff --git a/core/src/rust/src/exec.rs b/core/src/rust/src/exec.rs
new file mode 100644
index 0000000000..b4f18a5ff0
--- /dev/null
+++ b/core/src/rust/src/exec.rs
@@ -0,0 +1,56 @@
+//! Helpers for executing code in a JNI method
+
+use jni::{sys::jobject, JNIEnv};
+
+use crate::errors::JavaResult;
+
+/// Execs a function in a JNI context, supplying an environment
+/// and translating any errors to exceptions
+///
+/// All JNI functions should use this to ensure error handling
+/// is properly done
+///
+/// Do *not* panic in any calls - avoid unwrap, expect, etc.
+pub fn jni_exec<F, T>(env: &mut JNIEnv, func: F) -> T
+where
+    F: FnOnce(&mut JNIEnv) -> JavaResult<T>,
+    T: EarlyReturn,
+{
+    let ret = func(env);
+    match ret {
+        Ok(r) => r,
+        Err(e) => {
+            // An error occurred, throw an exception
+            e.set_exception_details(env);
+
+            T::abort_value()
+        }
+    }
+}
+
+/// Trait for early return values when an exception is being thrown
+pub trait EarlyReturn {
+    fn abort_value() -> Self;
+}
+
+impl EarlyReturn for jobject {
+    fn abort_value() -> Self {
+        std::ptr::null_mut()
+    }
+}
+
+impl EarlyReturn for i32 {
+    fn abort_value() -> Self {
+        0
+    }
+}
+
+impl EarlyReturn for i64 {
+    fn abort_value() -> Self {
+        0
+    }
+}
+
+impl EarlyReturn for () {
+    fn abort_value() -> Self {}
+}
diff --git a/core/src/rust/src/index.rs b/core/src/rust/src/index.rs
new file mode 100644
index 0000000000..2fdc7b1555
--- /dev/null
+++ b/core/src/rust/src/index.rs
@@ -0,0 +1,138 @@
+//! Methods to create / destroy the index
+
+use jni::{
+    objects::{JClass, JObjectArray, JString},
+    sys::jlong,
+    JNIEnv,
+};
+use tantivy::{
+    directory::MmapDirectory,
+    schema::{
+        FacetOptions, Field, JsonObjectOptions, Schema, SchemaBuilder, TextFieldIndexing, FAST,
+        INDEXED, STORED, STRING,
+    },
+    Index, TantivyDocument,
+};
+
+use crate::{
+    errors::{JavaException, JavaResult},
+    exec::jni_exec,
+    jnienv::JNIEnvExt,
+    state::{FieldConstants, IndexHandle},
+};
+
+pub const WRITER_MEM_BUDGET: usize = 50 * 1024 * 1024;
+
+/// Create a new index state object by loading and configuring schema
+#[no_mangle]
+pub extern "system" fn Java_filodb_core_memstore_TantivyNativeMethods_00024_newIndexHandle(
+    mut env: JNIEnv,
+    _class: JClass,
+    disk_location: JString,
+    schema_fields: JObjectArray,
+    map_fields: JObjectArray,
+    multi_column_facet_fields: JObjectArray,
+) -> jlong {
+    jni_exec(&mut env, |env| {
+        let disk_location: String = env.get_string(&disk_location)?.into();
+        let directory = MmapDirectory::open(disk_location)?;
+
+        // Build the schema for documents
+        let fields = FieldConstants::load(env)?;
+        let (schema, default_field) = build_schema(
+            env,
+            &schema_fields,
+            &map_fields,
+            &multi_column_facet_fields,
+            &fields,
+        )?;
+
+        // Open index
+        let index = Index::open_or_create(directory, schema.clone())?;
+        let writer = index.writer::<TantivyDocument>(WRITER_MEM_BUDGET)?;
+        let reader = index.reader()?;
+
+        Ok(IndexHandle::new_handle(
+            schema,
+            default_field,
+            writer,
+            reader,
+            fields,
+        ))
+    })
+}
+
+#[no_mangle]
+pub extern "system" fn Java_filodb_core_memstore_TantivyNativeMethods_00024_freeIndexHandle(
+    mut env: JNIEnv,
+    _class: JClass,
+    handle: jlong,
+) {
+    jni_exec(&mut env, |_| {
+        unsafe {
+            drop(Box::from_raw(handle as *mut IndexHandle));
+        }
+
+        Ok(())
+    });
+}
+
+fn build_schema(
+    env: &mut JNIEnv,
+    schema_fields: &JObjectArray,
+    map_fields: &JObjectArray,
+    multi_column_facet_fields: &JObjectArray,
+    constants: &FieldConstants,
+) -> JavaResult<(Schema, Option<Field>)> {
+    let mut builder = SchemaBuilder::new();
+
+    builder.add_text_field(&constants.part_id, STRING);
+    builder.add_i64_field(&constants.part_id_dv, INDEXED | STORED | FAST);
+    builder.add_bytes_field(&constants.part_key, INDEXED | STORED | FAST);
+    builder.add_i64_field(&constants.start_time, INDEXED | STORED | FAST);
+    builder.add_i64_field(&constants.end_time, INDEXED | STORED | FAST);
+
+    // Fields from input schema
+    env.foreach_string_in_array(schema_fields, |name| {
+        builder.add_text_field(&name, STRING);
+
+        Ok(())
+    })?;
+
+    // Map fields - only one supported
+    let len = env.get_array_length(map_fields)?;
+    if len > 1 {
+        return Err(JavaException::new_runtime_exception(
+            "More than one map field specified",
+        ));
+    }
+
+    let default_field = if len == 1 {
+        let name = env.get_object_array_element(map_fields, 0)?.into();
+        let name = env.get_rust_string(&name)?;
+
+        let field = builder.add_json_field(
+            &name,
+            JsonObjectOptions::default()
+                .set_indexing_options(TextFieldIndexing::default().set_tokenizer("raw")),
+        );
+
+        Some(field)
+    } else {
+        None
+    };
+
+    env.foreach_string_in_array(multi_column_facet_fields, |name| {
+        builder.add_facet_field(&constants.facet_field_name(&name), FacetOptions::default());
+
+        Ok(())
+    })?;
+
+    // Default facet for label list, always added
+    builder.add_facet_field(
+        &constants.facet_field_name(&constants.label_list),
+        FacetOptions::default(),
+    );
+
+    Ok((builder.build(), default_field))
+}
diff --git a/core/src/rust/src/jnienv.rs b/core/src/rust/src/jnienv.rs
new file mode 100644
index 0000000000..3a6f87eb08
--- /dev/null
+++ b/core/src/rust/src/jnienv.rs
@@ -0,0 +1,82 @@
+//! Extensions to JNIEnv
+
+use jni::{
+    objects::{JObject, JObjectArray, JString},
+    JNIEnv,
+};
+
+use crate::errors::JavaResult;
+
+/// Helper extensions for working with JVM types
+#[allow(dead_code)]
+pub trait JNIEnvExt<'a> {
+    /// Get a rust string from Java String
+    fn get_rust_string(&mut self, obj: &JString) -> JavaResult<String>;
+
+    /// Get a class name and return it as a string
+    /// This is equivilant to Java code `obj.class.name`
+    fn get_object_class_name(&mut self, obj: &JObject) -> JavaResult<String>;
+
+    /// Get a scala object instance
+    fn get_scala_object(&mut self, name: &str) -> JavaResult<JObject<'a>>;
+
+    /// Get a scala String val from an object
+    fn get_scala_text_constant(&mut self, obj: &JObject, name: &str) -> JavaResult<String>;
+
+    /// Run a closure over every String in a String[]
+    fn foreach_string_in_array<F>(&mut self, array: &JObjectArray, func: F) -> JavaResult<()>
+    where
+        F: FnMut(String) -> JavaResult<()>;
+}
+
+impl<'a> JNIEnvExt<'a> for JNIEnv<'a> {
+    fn get_rust_string(&mut self, obj: &JString) -> JavaResult<String> {
+        let ret = self.get_string(obj)?.into();
+        Ok(ret)
+    }
+
+    fn get_object_class_name(&mut self, obj: &JObject) -> JavaResult<String> {
+        let class = self.get_object_class(obj)?;
+        let name = self
+            .get_field(&class, "name", "Ljava/lang/String;")?
+            .l()?
+            .into();
+
+        let ret = self.get_string(&name)?.into();
+        Ok(ret)
+    }
+
+    fn get_scala_object(&mut self, name: &str) -> JavaResult<JObject<'a>> {
+        // objects are static fields on the class name named MODULE$
+        let obj = self
+            .get_static_field(format!("{name}$"), "MODULE$", format!("L{name}$;"))?
+            .l()?;
+
+        Ok(obj)
+    }
+
+    fn get_scala_text_constant(&mut self, obj: &JObject, name: &str) -> JavaResult<String> {
+        // private val foo = ""; is modeled in scala as a member method named foo that returns String
+        let val: JString = self
+            .call_method(obj, name, "()Ljava/lang/String;", &[])?
+            .l()?
+            .into();
+
+        let ret = self.get_string(&val)?.into();
+        Ok(ret)
+    }
+
+    fn foreach_string_in_array<F>(&mut self, array: &JObjectArray, mut func: F) -> JavaResult<()>
+    where
+        F: FnMut(String) -> JavaResult<()>,
+    {
+        let len = self.get_array_length(array)?;
+        for idx in 0..len {
+            let s = self.get_object_array_element(array, idx)?.into();
+            let s = self.get_rust_string(&s)?;
+            func(s)?;
+        }
+
+        Ok(())
+    }
+}
diff --git a/core/src/rust/src/lib.rs b/core/src/rust/src/lib.rs
new file mode 100644
index 0000000000..483adaf29b
--- /dev/null
+++ b/core/src/rust/src/lib.rs
@@ -0,0 +1,25 @@
+//! Native methods for FiloDB core
+//!
+//! This library extensively uses JNI to interop with JVM code.
+//!
+//! Any new code should do the following to ensure consistency:
+//!
+//! * All JNI methods should be wrapped in jni_exec.  This turns any
+//!   Rust errors into RuntimeExceptions and allows for cleaner Rust
+//!   error handling.
+//! * No panic/unwrap/expect calls should be used.  Panicing will destroy
+//!   the JVM process.
+//! * Try to use primitive types when possible.  Getting fields on JVM
+//!   objects requires reflection like overhead that can't be optimized
+//!   as well
+//! * Minimize the calls back into the JVM.  Perfer to get passed in
+//!   needed information as arguments vs calling object methods.
+//!
+
+#![deny(clippy::expect_used, clippy::unwrap_used, clippy::panic)]
+
+mod errors;
+mod exec;
+mod index;
+mod jnienv;
+mod state;
diff --git a/core/src/rust/src/state.rs b/core/src/rust/src/state.rs
new file mode 100644
index 0000000000..899d793d04
--- /dev/null
+++ b/core/src/rust/src/state.rs
@@ -0,0 +1,124 @@
+//! State objects shared with Java
+
+// Temporary until all logic is checked in
+#![allow(dead_code)]
+
+use std::{
+    collections::{BTreeMap, HashMap},
+    sync::{atomic::AtomicBool, Mutex, RwLock},
+};
+
+use jni::{sys::jlong, JNIEnv};
+use tantivy::{
+    schema::{Field, OwnedValue, Schema},
+    IndexReader, IndexWriter, TantivyDocument,
+};
+
+use crate::{errors::JavaResult, jnienv::JNIEnvExt};
+
+pub struct IndexHandle {
+    // Immutable fields that don't need synchronization
+    //
+    //
+    // Schema for this nidex
+    pub schema: Schema,
+    // Default field for JSON searches
+    pub default_field: Option<Field>,
+    // Field data
+    pub fields: FieldConstants,
+
+    // Fields that need synchronization
+    //
+    //
+    pub changes_pending: AtomicBool,
+    // Active writer
+    pub writer: RwLock<IndexWriter>,
+    // Active reader
+    pub reader: Mutex<IndexReader>,
+    // Actively ingesting doc
+    pub ingesting_doc: Mutex<IngestingDocument>,
+}
+
+impl IndexHandle {
+    pub fn new_handle(
+        schema: Schema,
+        default_field: Option<Field>,
+        writer: IndexWriter,
+        reader: IndexReader,
+        fields: FieldConstants,
+    ) -> jlong {
+        let obj = Box::new(Self {
+            schema,
+            default_field,
+            writer: RwLock::new(writer),
+            reader: Mutex::new(reader),
+            changes_pending: AtomicBool::new(false),
+            fields,
+            ingesting_doc: Mutex::new(IngestingDocument::default()),
+        });
+
+        Box::into_raw(obj) as jlong
+    }
+
+    /// Decode handle back into a reference
+    pub fn get_ref_from_handle<'a>(handle: jlong) -> &'a Self {
+        let ptr = handle as *const IndexHandle;
+
+        unsafe { &*ptr }
+    }
+}
+
+/// A document that is actively being built up for ingesting
+#[derive(Default)]
+pub struct IngestingDocument {
+    // List of map entries we're building up to store in the document
+    pub map_values: HashMap<String, BTreeMap<String, OwnedValue>>,
+    // List of field names in the document being ingested
+    pub field_names: Vec<String>,
+    // Document state for ingestion
+    pub doc: TantivyDocument,
+}
+
+const PART_KEY_INDEX_RAW_CLASS: &str = "filodb/core/memstore/PartKeyIndexRaw";
+
+// Field constants loaded from Scala classes
+pub struct FieldConstants {
+    pub part_id: String,
+    pub part_id_dv: String,
+    pub part_key: String,
+    pub start_time: String,
+    pub end_time: String,
+    pub label_list: String,
+    pub facet_field_prefix: String,
+}
+
+impl FieldConstants {
+    /// Get a computed facet field name
+    pub fn facet_field_name(&self, name: &str) -> String {
+        format!("{}{}", self.facet_field_prefix, name)
+    }
+
+    /// Load constants from Scala runtime classes
+    pub fn load(env: &mut JNIEnv) -> JavaResult<Self> {
+        let constants_object = env.get_scala_object(PART_KEY_INDEX_RAW_CLASS)?;
+
+        let part_id = env.get_scala_text_constant(&constants_object, "PART_ID_FIELD")?;
+        let part_id_dv = env.get_scala_text_constant(&constants_object, "PART_ID_DV")?;
+        let part_key = env.get_scala_text_constant(&constants_object, "PART_KEY")?;
+        let start_time = env.get_scala_text_constant(&constants_object, "START_TIME")?;
+        let end_time = env.get_scala_text_constant(&constants_object, "END_TIME")?;
+        let label_list = env.get_scala_text_constant(&constants_object, "LABEL_LIST")?;
+        let facet_field_prefix =
+            env.get_scala_text_constant(&constants_object, "FACET_FIELD_PREFIX")?;
+
+        Ok(Self {
+            part_id,
+            part_id_dv,
+            part_key,
+            start_time,
+            end_time,
+            label_list,
+            facet_field_prefix,
+        })
+    }
+}
diff --git a/core/src/test/resources/application_test.conf b/core/src/test/resources/application_test.conf
index a2fb216240..eab2a584f9 100644
--- a/core/src/test/resources/application_test.conf
+++ b/core/src/test/resources/application_test.conf
@@ -109,7 +109,7 @@ filodb {
     index-faceting-enabled-shard-key-labels = true
     index-faceting-enabled-for-all-labels = true
     disable-index-caching = false
-
+    part-key-index-type = lucene
   }
 
   tasks {
diff --git a/project/Dependencies.scala b/project/Dependencies.scala
index 0426db04eb..ed1ec11a85 100644
--- a/project/Dependencies.scala
+++ b/project/Dependencies.scala
@@ -80,7 +80,8 @@ object Dependencies {
     "com.esotericsoftware"         % "kryo"               % "4.0.0" excludeAll(excludeMinlog),
     "com.dorkbox"                  % "MinLog-SLF4J"       % "1.12",
     "com.github.ben-manes.caffeine" % "caffeine"          % "3.0.5",
-    "com.twitter"                  %% "chill"             % "0.9.3"
+    "com.twitter"                  %% "chill"             % "0.9.3",
+    "org.apache.commons"           % "commons-lang3"      % "3.14.0"
   )
 
   lazy val sparkJobsDeps = commonDeps ++ Seq(
diff --git a/project/FiloBuild.scala b/project/FiloBuild.scala
index 24cb7bb26e..fd5ca08f0f 100644
--- a/project/FiloBuild.scala
+++ b/project/FiloBuild.scala
@@ -1,5 +1,6 @@
 import Dependencies._
 import FiloSettings._
+import RustPlugin._
 import com.typesafe.sbt.SbtMultiJvm.MultiJvmKeys.MultiJvm
 import io.gatling.sbt.GatlingPlugin
 import pl.project13.scala.sbt.JmhPlugin
@@ -45,6 +46,7 @@ object Submodules {
   )
 
   lazy val core = (project in file("core"))
+    .enablePlugins(RustPlugin)
     .dependsOn(memory % "compile->compile; test->test")
     .settings(
       commonSettings,