## **2. Prerequisites**

- Install Hortonworks Distribution using this [guide.](https://docs.hortonworks.com/HDPDocuments/Ambari-2.7.1.0/bk_ambari-installation/content/ch_Installing_Ambari.html)
  - [Setup Ambari](https://docs.hortonworks.com/HDPDocuments/Ambari-2.7.1.0/bk_ambari-installation/content/set_up_the_ambari_server.html) which automatically sets up YARN

    /**
     * Hook method called before action execution. Sets up search-related flags and
     * registers popular words if enabled.
     *
     * @param runtime the action runtime context
     * @return the action response, or null to continue with normal processing
     */
    @Override
    public ActionResponse hookBefore(final ActionRuntime runtime) { // application may override

    private final Map<SID, SID> sidCache = new HashMap<>();

    /**
     * Constructs a SID cache implementation.
     *
     * @param baseContext the CIFS context for this cache
     */
    public SIDCacheImpl(final CIFSContext baseContext) {
    }

    void resolveSids(final DcerpcHandle handle, final LsaPolicyHandle policyHandle, final jcifs.SID[] sids) throws IOException {

import java.util.Properties;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import jcifs.CIFSContext;
import jcifs.config.PropertyConfiguration;
import jcifs.context.BaseContext;
import jcifs.smb.SmbTransportInternal;

/**
 * Integration tests for RDMA functionality.
 *
 * This class contains both unit tests (that always run) and integration tests

        System.out.println("Buffer Cache Stats: " + stats);
    }

    /**
     * Test encryption context performance without synchronization bottlenecks
     */
    @Test
    public void testEncryptionContextPerformance() throws Exception {
        // Create mock encryption context for testing (simplified)
        // Note: This tests the atomic operations without actual encryption

        int threadCount = 8;

import java.util.function.IntConsumer;
import java.util.stream.IntStream;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/** Test Java8 map.compute in concurrent cache context. */
@NullUnmarked
public class LocalCacheMapComputeTest extends TestCase {
  final int count = 10000;
  final String delimiter = "-";
  final String key = "key";
  Cache<String, String> cache;

  // helper

    private final SmbPipeHandleInternal handle;

    /**
     * Creates a DCERPC pipe handle for named pipe communication
     * @param url the DCERPC URL specifying the endpoint
     * @param tc the CIFS context for connection configuration
     * @param unshared whether to use an exclusive connection
     * @throws DcerpcException if DCERPC initialization fails
     * @throws MalformedURLException if the URL is malformed
     */

     * is queried frequently and exceptions would be rather costly to
     * throw on a regular basis here.
     *
     * @param host the hostname to resolve
     * @param tc the CIFS context
     * @return resolved name, null if not found
     */
    public synchronized NbtAddress getByName(final String host, final CIFSContext tc) {
        return getByName(new Name(tc.getConfig(), host, 0x20, null), tc);
    }

```Python
with open("./somefile.txt") as f:
    contents = f.read()
    print(contents)
```

내부적으로 `open("./somefile.txt")` 는 "컨텍스트 관리자(Context Manager)"라고 불리는 객체를 생성합니다.

`with` 블록이 끝나면, 예외가 발생했더라도 파일을 닫도록 보장합니다.

`yield`가 있는 의존성을 생성하면 **FastAPI**는 내부적으로 이를 위한 컨텍스트 매니저를 생성하고 다른 관련 도구들과 결합합니다.

set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Des-foreground=yes
set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dfess.home="%FESS_HOME%"
set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dfess.es.dir="%SEARCH_ENGINE_HOME%"
set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dfess.context.path=/
set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dfess.port=8080
set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dfess.webapp.path=%FESS_HOME%\app
set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dfess.temp.path=%FESS_HOME%\temp