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This document introduces the Impala project layout and some key configuration variables. Beware that it may become stale over time as the project evolves.
Impala can be built with pre-built components or components downloaded from S3. The components needed to build Impala are Apache Hadoop, Hive, and HBase. If you need to manually override the locations or versions of these components, you can do so through the environment variables and scripts listed below.
| Location | Purpose |
|---|---|
| bin/impala-config.sh | This script must be sourced to setup all environment variables properly to allow other scripts to work |
| bin/impala-config-local.sh | A script can be created in this location to set local overrides for any environment variables |
| bin/impala-config-branch.sh | A version of the above that can be checked into a branch for convenience. |
| bin/bootstrap_build.sh | A helper script to bootstrap some of the build requirements. |
| bin/bootstrap_development.sh | A helper script to bootstrap a developer environment. Please read it before using. |
| be/build/ | Impala build output goes here. |
| be/generated-sources/ | Thrift and other generated source will be found here. |
| Environment variable | Default value | Description |
|---|---|---|
| IMPALA_HOME | Top level Impala directory | |
| IMPALA_TOOLCHAIN | "${IMPALA_HOME}/toolchain" | Native toolchain directory (for compilers, libraries, etc.) |
| SKIP_TOOLCHAIN_BOOTSTRAP | "false" | Skips downloading the toolchain any python dependencies if "true" |
| CDP_BUILD_NUMBER | Identifier to indicate the CDP build number | |
| CDP_COMPONENTS_HOME | "${IMPALA_HOME}/toolchain/cdp_components-${CDP_BUILD_NUMBER}" | Location of the CDP components within the toolchain. |
| CDH_MAJOR_VERSION | "7" | Identifier used to uniqueify paths for potentially incompatible component builds. |
| IMPALA_CONFIG_SOURCED | "1" | Set by ${IMPALA_HOME}/bin/impala-config.sh (internal use) |
| IMPALA_JDK_VERSION | "" | Set to 8+ to select a system Java version. Empty value uses JAVA_HOME, or sets it based on system defaults. |
| JAVA_HOME | "" | Uses Java from JAVA_HOME unless IMPALA_JDK_VERSION is set. |
| JAVA | "${JAVA_HOME}/bin/java" | Java binary location. |
| CLASSPATH | See bin/set-classpath.sh for details. | |
| PYTHONPATH | See bin/set-pythonpath.sh for details. | |
| USE_APACHE_COMPONENTS | false | Use Apache components for Hadoop, HBase, Hive, Tez, Ranger. It will set USE_APACHE_{HADOOP,HBASE,HIVE,TEZ,RANGER} variable as true if not set false. |
| USE_APACHE_HADOOP | false | Use Apache Hadoop |
| USE_APACHE_HBASE | false | Use Apache HBase |
| USE_APACHE_HIVE_3 | false | Use Apache Hive-3 |
| USE_APACHE_TEZ | false | Use Apache Tez |
| USE_APACHE_RANGER | false | Use Apache Ranger |
| DOWNLOAD_CDH_COMPONENTS | true | Download CDH components |
| DOWNLOAD_APACHE_COMPONENTS | true | Download Apache components |
| Environment variable | Default value | Description |
|---|---|---|
| IMPALA_BE_DIR | "${IMPALA_HOME}/be" | Backend directory. Build output is also stored here. |
| IMPALA_FE_DIR | "${IMPALA_HOME}/fe" | Frontend directory |
| IMPALA_COMMON_DIR | "${IMPALA_HOME}/common" | Common code (thrift, function registry) |
| Environment variable | Default value | Description |
|---|---|---|
| IMPALA_BUILD_THREADS | Number of processors. | Used for make -j and distcc -j settings. |
| IMPALA_LINK_THREADS | Bounded based on available memory. | Used for ninja. |
| IMPALA_MAKE_CMD | "make" | Make tool to use by default, options are make or ninja. |
| IMPALA_MAKE_FLAGS | "" | Any extra settings to pass to make. Also used when copying udfs / udas into HDFS. |
| USE_SYSTEM_GCC | "0" | If set to any other value, directs cmake to not set GCC_ROOT, CMAKE_C_COMPILER, CMAKE_CXX_COMPILER, as well as setting TOOLCHAIN_LINK_FLAGS |
| IMPALA_CXX_COMPILER | "default" | Used by cmake (cmake_modules/toolchain and clang_toolchain.cmake) to select gcc / clang |
| IMPALA_LINKER | "gold" | Specifies the linker to use; options are "gold", "mold", or "ld". |
| IS_OSX | "false" | (Experimental) currently only used to disable Kudu. |
| Environment variable | Default value | Description |
|---|---|---|
| HADOOP_HOME | "${CDP_COMPONENTS_HOME}/hadoop-${IMPALA_HADOOP_VERSION}/" | Used to locate Hadoop |
| HADOOP_INCLUDE_DIR | "${HADOOP_HOME}/include" | For 'hdfs.h' |
| HADOOP_LIB_DIR | "${HADOOP_HOME}/lib" | For 'libhdfs.a' or 'libhdfs.so' |
| HIVE_HOME | "${CDP_COMPONENTS_HOME}/{hive-${IMPALA_HIVE_VERSION}/" | |
| HBASE_HOME | "${CDP_COMPONENTS_HOME}/hbase-${IMPALA_HBASE_VERSION}/" | |
| THRIFT_CPP_HOME | "${IMPALA_TOOLCHAIN}/thrift-${IMPALA_THRIFT_CPP_VERSION}" | |
| THRIFT_JAVA_HOME | "${IMPALA_TOOLCHAIN}/thrift-${IMPALA_THRIFT_JAVA_VERSION}" | |
| THRIFT_PY_HOME | "${IMPALA_TOOLCHAIN}/thrift-${IMPALA_THRIFT_PY_VERSION}" |
Typically used together to specify a local build of Apache Hive. Care should be taken while using these variables since they take precedence over the defaults in impala-config.sh, they may cause confusion when switching between branches or versions of Apache Impala.
| Environment variable | Description |
|---|---|
| HIVE_VERSION_OVERRIDE | Used to specify different Hive version from default |
| HIVE_STORAGE_API_VERSION_OVERRIDE | Used to specify different Hive Storage API version from default |
| HIVE_METASTORE_THRIFT_DIR_OVERRIDE | Used to specify location of metastore thrift files to use during Thrift compilation |
| HIVE_HOME_OVERRIDE | Used to specify location of Hive |
Typically used together to specify a local build of Apache Ranger. Care should be taken while using these variables since they take precedence over the defaults in impala-config.sh.
| Environment variable | Description |
|---|---|
| RANGER_VERSION_OVERRIDE | Used to specify different Ranger version from default |
| RANGER_HOME_OVERRIDE | Used to specify location of Ranger |
$ claude mcp add impala \
-- python -m otcore.mcp_server <graph>