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HADOOP-10079. log a warning message if group resolution takes too long (cmccabe) 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1538108 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Colin McCabe 2013-11-02 00:42:59 +00:00
parent 3b91b7dece
commit b7aca6bd90
4 changed files with 41 additions and 8 deletions
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3
hadoop-common-project/hadoop-common/CHANGES.txt
View File

@ -428,6 +428,9 @@ Release 2.2.1 - UNRELEASED
HADOOP-10046. Print a log message when SSL is enabled.
(David S. Wang via wang)
HADOOP-10079. log a warning message if group resolution takes too long.
(cmccabe)
OPTIMIZATIONS
BUG FIXES

8
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeysPublic.java
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@ -240,6 +240,14 @@ public class CommonConfigurationKeysPublic {
public static final String HADOOP_SECURITY_GROUPS_CACHE_SECS =
"hadoop.security.groups.cache.secs";
/** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
public static final long HADOOP_SECURITY_GROUPS_CACHE_SECS_DEFAULT =
300;
/** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
public static final String HADOOP_SECURITY_GROUPS_CACHE_WARN_AFTER_MS =
"hadoop.security.groups.cache.warn.after.ms";
public static final long HADOOP_SECURITY_GROUPS_CACHE_WARN_AFTER_MS_DEFAULT =
5000;
/** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
public static final String HADOOP_SECURITY_AUTHENTICATION =
"hadoop.security.authentication";
/** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */

27
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/Groups.java
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@ -50,6 +50,7 @@ public class Groups {
private final Map<String, CachedGroups> userToGroupsMap =
new ConcurrentHashMap<String, CachedGroups>();
private final long cacheTimeout;
private final long warningDeltaMs;
public Groups(Configuration conf) {
impl =
@ -60,11 +61,16 @@ public class Groups {
conf);
cacheTimeout =
conf.getLong(CommonConfigurationKeys.HADOOP_SECURITY_GROUPS_CACHE_SECS, 5*60) * 1000;
conf.getLong(CommonConfigurationKeys.HADOOP_SECURITY_GROUPS_CACHE_SECS,
CommonConfigurationKeys.HADOOP_SECURITY_GROUPS_CACHE_SECS_DEFAULT) * 1000;
warningDeltaMs =
conf.getLong(CommonConfigurationKeys.HADOOP_SECURITY_GROUPS_CACHE_WARN_AFTER_MS,
CommonConfigurationKeys.HADOOP_SECURITY_GROUPS_CACHE_WARN_AFTER_MS_DEFAULT);
if(LOG.isDebugEnabled())
LOG.debug("Group mapping impl=" + impl.getClass().getName() +
"; cacheTimeout=" + cacheTimeout);
"; cacheTimeout=" + cacheTimeout + "; warningDeltaMs=" +
warningDeltaMs);
}
/**
@ -76,9 +82,9 @@ public class Groups {
public List<String> getGroups(String user) throws IOException {
// Return cached value if available
CachedGroups groups = userToGroupsMap.get(user);
long now = Time.now();
long startMs = Time.monotonicNow();
// if cache has a value and it hasn't expired
if (groups != null && (groups.getTimestamp() + cacheTimeout > now)) {
if (groups != null && (groups.getTimestamp() + cacheTimeout > startMs)) {
if(LOG.isDebugEnabled()) {
LOG.debug("Returning cached groups for '" + user + "'");
}
@ -86,7 +92,14 @@ public class Groups {
}
// Create and cache user's groups
groups = new CachedGroups(impl.getGroups(user));
List<String> groupList = impl.getGroups(user);
long endMs = Time.monotonicNow();
long deltaMs = endMs - startMs ;
if (deltaMs > warningDeltaMs) {
LOG.warn("Potential performance problem: getGroups(user=" + user +") " +
"took " + deltaMs + " milliseconds.");
}
groups = new CachedGroups(groupList, endMs);
if (groups.getGroups().isEmpty()) {
throw new IOException("No groups found for user " + user);
}
@ -133,9 +146,9 @@ public class Groups {
/**
* Create and initialize group cache
*/
CachedGroups(List<String> groups) {
CachedGroups(List<String> groups, long timestamp) {
this.groups = groups;
this.timestamp = Time.now();
this.timestamp = timestamp;
}
/**

9
hadoop-common-project/hadoop-common/src/main/resources/core-default.xml
View File

@ -105,6 +105,15 @@
</description>
</property>
<property>
<name>hadoop.security.groups.cache.warn.after.ms</name>
<value>5000</value>
<description>
If looking up a single user to group takes longer than this amount of
milliseconds, we will log a warning message.
</description>
</property>
<property>
<name>hadoop.security.group.mapping.ldap.url</name>
<value></value>