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HDFS-9768. Reuse ObjectMapper instance in HDFS to improve the performance. Contributed by Lin Yiqun.

This commit is contained in:
Akira Ajisaka 2016-02-13 01:57:24 +09:00
parent 51fc7f5427
commit e6a7044b85
7 changed files with 31 additions and 23 deletions
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8
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/oauth2/ConfRefreshTokenBasedAccessTokenProvider.java
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@ -29,6 +29,7 @@
import org.apache.hadoop.util.Timer;
import org.apache.http.HttpStatus;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.ObjectReader;
import java.io.IOException;
import java.util.Map;
@ -54,6 +55,8 @@
@InterfaceStability.Evolving
public class ConfRefreshTokenBasedAccessTokenProvider
extends AccessTokenProvider {
private static final ObjectReader READER =
new ObjectMapper().reader(Map.class);
public static final String OAUTH_REFRESH_TOKEN_KEY
= "dfs.webhdfs.oauth2.refresh.token";
@ -126,10 +129,7 @@ void refresh() throws IOException {
+ responseBody.code() + ", text = " + responseBody.toString());
}
ObjectMapper mapper = new ObjectMapper();
Map<?, ?> response = mapper.reader(Map.class)
.readValue(responseBody.body().string());
Map<?, ?> response = READER.readValue(responseBody.body().string());
String newExpiresIn = response.get(EXPIRES_IN).toString();
accessTokenTimer.setExpiresIn(newExpiresIn);

8
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/oauth2/CredentialBasedAccessTokenProvider.java
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@ -29,6 +29,7 @@
import org.apache.hadoop.util.Timer;
import org.apache.http.HttpStatus;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.ObjectReader;
import java.io.IOException;
import java.util.Map;
@ -54,6 +55,9 @@
@InterfaceStability.Evolving
public abstract class CredentialBasedAccessTokenProvider
extends AccessTokenProvider {
private static final ObjectReader READER =
new ObjectMapper().reader(Map.class);
public static final String OAUTH_CREDENTIAL_KEY
= "dfs.webhdfs.oauth2.credential";
@ -119,9 +123,7 @@ void refresh() throws IOException {
+ responseBody.code() + ", text = " + responseBody.toString());
}
ObjectMapper mapper = new ObjectMapper();
Map<?, ?> response = mapper.reader(Map.class)
.readValue(responseBody.body().string());
Map<?, ?> response = READER.readValue(responseBody.body().string());
String newExpiresIn = response.get(EXPIRES_IN).toString();
timer.setExpiresIn(newExpiresIn);

3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -1978,6 +1978,9 @@ Release 2.8.0 - UNRELEASED
HDFS-9686. Remove useless boxing/unboxing code.
(Kousuke Saruta via aajisaka)
HDFS-9768. Reuse ObjectMapper instance in HDFS to improve the performance.
(Lin Yiqun via aajisaka)
BUG FIXES
HDFS-7501. TransactionsSinceLastCheckpoint can be negative on SBNs.

16
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
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@ -62,6 +62,8 @@
import org.apache.hadoop.util.Timer;
import org.codehaus.jackson.annotate.JsonProperty;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.ObjectReader;
import org.codehaus.jackson.map.ObjectWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ -80,6 +82,10 @@
public class FsVolumeImpl implements FsVolumeSpi {
public static final Logger LOG =
LoggerFactory.getLogger(FsVolumeImpl.class);
private static final ObjectWriter WRITER =
new ObjectMapper().writerWithDefaultPrettyPrinter();
private static final ObjectReader READER =
new ObjectMapper().reader(BlockIteratorState.class);
private final FsDatasetImpl dataset;
private final String storageID;
@ -708,10 +714,9 @@ public void rewind() {
public void save() throws IOException {
state.lastSavedMs = Time.now();
boolean success = false;
ObjectMapper mapper = new ObjectMapper();
try (BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(
new FileOutputStream(getTempSaveFile(), false), "UTF-8"))) {
mapper.writerWithDefaultPrettyPrinter().writeValue(writer, state);
WRITER.writeValue(writer, state);
success = true;
} finally {
if (!success) {
@ -725,17 +730,16 @@ public void save() throws IOException {
StandardCopyOption.ATOMIC_MOVE);
if (LOG.isTraceEnabled()) {
LOG.trace("save({}, {}): saved {}", storageID, bpid,
mapper.writerWithDefaultPrettyPrinter().writeValueAsString(state));
WRITER.writeValueAsString(state));
}
}
public void load() throws IOException {
ObjectMapper mapper = new ObjectMapper();
File file = getSaveFile();
this.state = mapper.reader(BlockIteratorState.class).readValue(file);
this.state = READER.readValue(file);
LOG.trace("load({}, {}): loaded iterator {} from {}: {}", storageID,
bpid, name, file.getAbsoluteFile(),
mapper.writerWithDefaultPrettyPrinter().writeValueAsString(state));
WRITER.writeValueAsString(state));
}
File getSaveFile() {

5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -248,6 +248,7 @@
import org.apache.hadoop.hdfs.server.protocol.StorageReceivedDeletedBlocks;
import org.apache.hadoop.hdfs.server.protocol.StorageReport;
import org.apache.hadoop.hdfs.server.protocol.VolumeFailureSummary;
import org.apache.hadoop.hdfs.web.JsonUtil;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.ipc.CallerContext;
@ -275,7 +276,6 @@
import org.apache.log4j.Appender;
import org.apache.log4j.AsyncAppender;
import org.apache.log4j.Logger;
import org.codehaus.jackson.map.ObjectMapper;
import org.mortbay.util.ajax.JSON;
import com.google.common.annotations.VisibleForTesting;
@ -4557,9 +4557,8 @@ public String getTopUserOpCounts() {
Map<String, Object> topMap = new TreeMap<String, Object>();
topMap.put("windows", topWindows);
topMap.put("timestamp", DFSUtil.dateToIso8601String(now));
ObjectMapper mapper = new ObjectMapper();
try {
return mapper.writeValueAsString(topMap);
return JsonUtil.toJsonString(topMap);
} catch (IOException e) {
LOG.warn("Failed to fetch TopUser metrics", e);
}

10
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/FSImageLoader.java
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@ -54,7 +54,6 @@
import org.apache.hadoop.hdfs.web.resources.XAttrEncodingParam;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.util.LimitInputStream;
import org.codehaus.jackson.map.ObjectMapper;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
@ -263,10 +262,9 @@ static String[] loadStringTable(InputStream in) throws
* @throws IOException if failed to serialize fileStatus to JSON.
*/
String getFileStatus(String path) throws IOException {
ObjectMapper mapper = new ObjectMapper();
FsImageProto.INodeSection.INode inode = fromINodeId(lookup(path));
return "{\"FileStatus\":\n"
+ mapper.writeValueAsString(getFileStatus(inode, false)) + "\n}\n";
+ JsonUtil.toJsonString(getFileStatus(inode, false)) + "\n}\n";
}
/**
@ -277,7 +275,6 @@ String getFileStatus(String path) throws IOException {
*/
String listStatus(String path) throws IOException {
StringBuilder sb = new StringBuilder();
ObjectMapper mapper = new ObjectMapper();
List<Map<String, Object>> fileStatusList = getFileStatusList(path);
sb.append("{\"FileStatuses\":{\"FileStatus\":[\n");
int i = 0;
@ -285,7 +282,7 @@ String listStatus(String path) throws IOException {
if (i++ != 0) {
sb.append(',');
}
sb.append(mapper.writeValueAsString(fileStatusMap));
sb.append(JsonUtil.toJsonString(fileStatusMap));
}
sb.append("\n]}}\n");
return sb.toString();
@ -318,9 +315,8 @@ private List<Map<String, Object>> getFileStatusList(String path)
* @throws IOException if failed to serialize ContentSummary to JSON.
*/
String getContentSummary(String path) throws IOException {
ObjectMapper mapper = new ObjectMapper();
return "{\"ContentSummary\":\n"
+ mapper.writeValueAsString(getContentSummaryMap(path)) + "\n}\n";
+ JsonUtil.toJsonString(getContentSummaryMap(path)) + "\n}\n";
}
private Map<String, Object> getContentSummaryMap(String path)

4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/JsonUtil.java
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@ -389,4 +389,8 @@ public static String toJsonString(final List<XAttr> xAttrs)
return MAPPER.writeValueAsString(finalMap);
}
public static String toJsonString(Object obj) throws IOException {
return MAPPER.writeValueAsString(obj);
}
}