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https://issues.apache.org/jira/browse/HADOOP-15322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16403531#comment-16403531
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Ganesh commented on HADOOP-15322:
---------------------------------
Looking through the code:
..
String LDAP_CONFIG_PREFIX = "hadoop.security.group.mapping.ldap";
String BASE_DN_KEY = LDAP_CONFIG_PREFIX + ".base";
baseDN = conf.get(BASE_DN_KEY, BASE_DN_DEFAULT);
..
and this baseDN is used in search for posixAccount and posixGroup .
..
NamingEnumeration<SearchResult> results = ctx.search(baseDN,
userSearchFilter,
new Object[]{user},
SEARCH_CONTROLS);
..
groupResults =
ctx.search(baseDN,
"(&"+ groupSearchFilter + "(|(" + posixGidAttr + "={0})" +
"(" + groupMemberAttr + "={1})))",
new Object[] { gidNumber, uidNumber },
SEARCH_CONTROLS);
Because the same baseDN is used in the the search, we are forced to set the
search base of the ldap tree from dc=XX,dc=YY,dc=ZZ. This is generally not a
problem. But most ldap servers have a limit on the number of entries returned
in the search result(usually 2K to 10K) as a measure to prevent DDoS.
If we can add 2 keys something like
{code}
hadoop.security.group.mapping.ldap.base.user
hadoop.security.group.mapping.ldap.base.group
{code}
Then we could use valueof 'hadoop.security.group.mapping.ldap.base.user' to
search posixAccount and
use valueof 'hadoop.security.group.mapping.ldap.base.group' to search for
posixGroup and avoid searching a larger tree rooted from dc=XX,dc=YY,dc=ZZ .
This would also help minimize the number of entries returned in the search
result.
(ofcourse another option is to use paged search result support)
> LDAPGroupMapping search tree base improvement
> ---------------------------------------------
>
> Key: HADOOP-15322
> URL: https://issues.apache.org/jira/browse/HADOOP-15322
> Project: Hadoop Common
> Issue Type: Improvement
> Components: common
> Affects Versions: 2.7.4
> Reporter: Ganesh
> Priority: Major
> Fix For: 2.7.6
>
>
> Currently the same ldap base is used for searching posixAccount and
> posixGroup. This request is to make a separate base for each container (ie
> posixAccount and posixGroup container)
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