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https://issues.apache.org/jira/browse/HDFS-4222?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Suresh Srinivas resolved HDFS-4222.
-----------------------------------
Resolution: Fixed
Fix Version/s: 1.2.0
Hadoop Flags: Reviewed
I committed the patch to branch-1 as well. Thank you Xiaobo!
> NN is unresponsive and lose heartbeats of DNs when Hadoop is configured to
> use LDAP and LDAP has issues
> -------------------------------------------------------------------------------------------------------
>
> Key: HDFS-4222
> URL: https://issues.apache.org/jira/browse/HDFS-4222
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 1.0.0, 0.23.3, 2.0.0-alpha
> Reporter: Xiaobo Peng
> Assignee: Xiaobo Peng
> Priority: Minor
> Fix For: 1.2.0, 0.23.7, 2.0.4-beta
>
> Attachments: HDFS-4222.23.patch, hdfs-4222-branch-0.23.3.patch,
> HDFS-4222-branch-1.patch, HDFS-4222.patch, HDFS-4222.patch,
> hdfs-4222-release-1.0.3.patch
>
>
> For Hadoop clusters configured to access directory information by LDAP, the
> FSNamesystem calls on behave of DFS clients might hang due to LDAP issues
> (including LDAP access issues caused by networking issues) while holding the
> single lock of FSNamesystem. That will result in the NN unresponsive and loss
> of the heartbeats from DNs.
> The places LDAP got accessed by FSNamesystem calls are the instantiation of
> FSPermissionChecker, which could be moved out of the lock scope since the
> instantiation does not need the FSNamesystem lock. After the move, a DFS
> client hang will not affect other threads by hogging the single lock. This is
> especially helpful when we use separate RPC servers for ClientProtocol and
> DatanodeProtocol since the calls for DatanodeProtocol do not need to access
> LDAP. So even if DFS clients hang due to LDAP issues, the NN will still be
> able to process the requests (including heartbeats) from DNs.
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