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HBASE-29775 Allow inspecting log levels in Master UI in read-only mode #7540

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HBASE-29775 Allow inspecting log levels in Master UI in read-only mode #7540

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03444e5
HBASE-29775 Allow inspecting log levels in Master UI in read-only mode
jinhyukify Dec 12, 2025
aad663f
HBASE-29775 Refactor LogLevel CLI to separate response fetching from …
jinhyukify Dec 26, 2025
91167a0
HBASE-29775 Add tests for LogLevel readonly master UI mode
jinhyukify Dec 26, 2025
6b03852
HBASE-29775 Propagate IOException instead of catching it
jinhyukify Dec 28, 2025
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47 changes: 29 additions & 18 deletions hbase-http/src/main/java/org/apache/hadoop/hbase/http/log/LogLevel.java
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@
import java.nio.charset.StandardCharsets;
import java.util.Objects;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSocketFactory;
import javax.servlet.ServletException;
Expand Down Expand Up @@ -60,6 +61,7 @@ public final class LogLevel {
public static final String PROTOCOL_HTTPS = "https";

public static final String READONLY_LOGGERS_CONF_KEY = "hbase.ui.logLevels.readonly.loggers";
public static final String MASTER_UI_READONLY_CONF_KEY = "hbase.master.ui.readonly";

/**
* A command line implementation
Expand Down Expand Up @@ -213,7 +215,11 @@ private int parseProtocolArgs(String[] args, int index) throws HadoopIllegalArgu
* @throws Exception if unable to connect
*/
private void doGetLevel() throws Exception {
process(protocol + "://" + hostName + "/logLevel?log=" + className);
System.out.println(fetchGetLevelResponse());
}

String fetchGetLevelResponse() throws Exception {
return fetchResponse(protocol + "://" + hostName + "/logLevel?log=" + className);
Comment on lines +218 to +222
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@jinhyukify jinhyukify Dec 27, 2025

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The previous implementation printed results only to standard output, making it hard to write tests. I refactored the code slightly to separate the logic.

}

/**
Expand All @@ -222,7 +228,12 @@ private void doGetLevel() throws Exception {
* @throws Exception if unable to connect
*/
private void doSetLevel() throws Exception {
process(protocol + "://" + hostName + "/logLevel?log=" + className + "&level=" + level);
System.out.println(fetchSetLevelResponse());
}

String fetchSetLevelResponse() throws Exception {
return fetchResponse(
protocol + "://" + hostName + "/logLevel?log=" + className + "&level=" + level);
}

/**
Expand Down Expand Up @@ -256,11 +267,12 @@ private HttpURLConnection connect(URL url) throws Exception {
}

/**
* Configures the client to send HTTP request to the URL. Supports SPENGO for authentication.
* Send HTTP request and fetch response.
* @param urlString URL and query string to the daemon's web UI
* @return the response from the daemon
* @throws Exception if unable to connect
*/
private void process(String urlString) throws Exception {
private String fetchResponse(String urlString) throws Exception {
URL url = new URL(urlString);
System.out.println("Connecting to " + url);

Expand All @@ -272,16 +284,14 @@ private void process(String urlString) throws Exception {
// disallowed in configuration" in Jetty 9
LogLevelExceptionUtils.validateResponse(connection, 200);

// read from the servlet

try (
InputStreamReader streamReader =
new InputStreamReader(connection.getInputStream(), StandardCharsets.UTF_8);
BufferedReader bufferedReader = new BufferedReader(streamReader)) {
bufferedReader.lines().filter(Objects::nonNull).filter(line -> line.startsWith(MARKER))
.forEach(line -> System.out.println(TAG.matcher(line).replaceAll("")));
} catch (IOException ioe) {
System.err.println("" + ioe);

return bufferedReader.lines().filter(Objects::nonNull)
.filter(line -> line.startsWith(MARKER)).map(line -> TAG.matcher(line).replaceAll(""))
.collect(Collectors.joining("\n"));
}
}
}
Expand All @@ -303,14 +313,6 @@ public void doGet(HttpServletRequest request, HttpServletResponse response)
if (!HttpServer.hasAdministratorAccess(getServletContext(), request, response)) {
return;
}
// Disallow modification of the LogLevel if explicitly set to readonly
Configuration conf =
(Configuration) getServletContext().getAttribute(HttpServer.CONF_CONTEXT_ATTRIBUTE);
if (conf.getBoolean("hbase.master.ui.readonly", false)) {
sendError(response, HttpServletResponse.SC_FORBIDDEN,
"Modification of HBase via the UI is disallowed in configuration.");
return;
}
response.setContentType("text/html");
PrintWriter out;
try {
Expand All @@ -326,6 +328,8 @@ public void doGet(HttpServletRequest request, HttpServletResponse response)
String logName = ServletUtil.getParameter(request, "log");
String level = ServletUtil.getParameter(request, "level");

Configuration conf =
(Configuration) getServletContext().getAttribute(HttpServer.CONF_CONTEXT_ATTRIBUTE);
String[] readOnlyLogLevels = conf.getStrings(READONLY_LOGGERS_CONF_KEY);

if (logName != null) {
Expand All @@ -335,6 +339,13 @@ public void doGet(HttpServletRequest request, HttpServletResponse response)
Logger log = LoggerFactory.getLogger(logName);
out.println(MARKER + "Log Class: <b>" + log.getClass().getName() + "</b><br />");
if (level != null) {
// Disallow modification of the LogLevel if explicitly set to readonly
if (conf.getBoolean(MASTER_UI_READONLY_CONF_KEY, false)) {
sendError(response, HttpServletResponse.SC_FORBIDDEN,
"Modification of HBase via the UI is disallowed in configuration.");
return;
}

if (!isLogLevelChangeAllowed(logName, readOnlyLogLevels)) {
sendError(response, HttpServletResponse.SC_PRECONDITION_FAILED,
"Modification of logger " + logName + " is disallowed in configuration.");
Expand Down
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