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HDFS-16323. DatanodeHttpServer doesn't require handler state map while retrieving filter handlers (#3659) 

(cherry picked from commit 646c470e5d)
This commit is contained in:
Viraj Jasani 2021-11-17 18:47:09 +05:30 committed by Takanobu Asanuma
parent e1267608ec
commit 4e77f772fc
1 changed files with 2 additions and 6 deletions
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8
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/DatanodeHttpServer.java
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@ -64,7 +64,6 @@ import java.nio.channels.ServerSocketChannel;
import java.security.GeneralSecurityException; import java.security.GeneralSecurityException;
import java.util.Enumeration; import java.util.Enumeration;
import java.util.Map; import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_ADMIN; import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_ADMIN;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_HTTPS_ADDRESS_DEFAULT; import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_HTTPS_ADDRESS_DEFAULT;
@ -77,8 +76,6 @@ import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_HTTP_INTERNAL_PR
*/ */
public class DatanodeHttpServer implements Closeable { public class DatanodeHttpServer implements Closeable {
static final Logger LOG = LoggerFactory.getLogger(DatanodeHttpServer.class); static final Logger LOG = LoggerFactory.getLogger(DatanodeHttpServer.class);
private static final ConcurrentHashMap<Class<?>, Object> HANDLER_STATE
= new ConcurrentHashMap<Class<?>, Object>() {};
// HttpServer threads are only used for the web UI and basic servlets, so // HttpServer threads are only used for the web UI and basic servlets, so
// set them to the minimum possible // set them to the minimum possible
private static final int HTTP_SELECTOR_THREADS = 1; private static final int HTTP_SELECTOR_THREADS = 1;
@ -281,11 +278,10 @@ public class DatanodeHttpServer implements Closeable {
try { try {
Method initializeState = classes[i].getDeclaredMethod("initializeState", Method initializeState = classes[i].getDeclaredMethod("initializeState",
Configuration.class); Configuration.class);
Constructor constructor = Constructor<?> constructor =
classes[i].getDeclaredConstructor(initializeState.getReturnType()); classes[i].getDeclaredConstructor(initializeState.getReturnType());
handlers[i] = (ChannelHandler) constructor.newInstance( handlers[i] = (ChannelHandler) constructor.newInstance(
HANDLER_STATE.getOrDefault(classes[i], initializeState.invoke(null, configuration));
initializeState.invoke(null, configuration)));
} catch (NoSuchMethodException | InvocationTargetException } catch (NoSuchMethodException | InvocationTargetException
| IllegalAccessException | InstantiationException | IllegalAccessException | InstantiationException
| IllegalArgumentException e) { | IllegalArgumentException e) {