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https://issues.apache.org/jira/browse/HDFS-7597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15343202#comment-15343202
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Hudson commented on HDFS-7597:
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SUCCESS: Integrated in Hadoop-trunk-Commit #9998 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/9998/])
HDFS-7597. DelegationTokenIdentifier should cache the TokenIdentifier to
(aajisaka: rev d433b16ce6d74f1a44bc29446c74b1cb5f8a10fa)
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/web/webhdfs/DataNodeUGIProvider.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/common/TestJspHelper.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/security/TestDelegationToken.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/web/webhdfs/TestDataNodeUGIProvider.java
*
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/security/token/delegation/DelegationTokenIdentifier.java
> DelegationTokenIdentifier should cache the TokenIdentifier to UGI mapping
> -------------------------------------------------------------------------
>
> Key: HDFS-7597
> URL: https://issues.apache.org/jira/browse/HDFS-7597
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: webhdfs
> Affects Versions: 2.0.0-alpha
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Priority: Critical
> Fix For: 2.8.0
>
> Attachments: HDFS-7597.01.patch, HDFS-7597.patch, HDFS-7597.patch,
> HDFS-7597.patch
>
>
> Webhdfs seeks involve closing the current connection, and reissuing a new
> open request with the new offset. The RPC layer caches connections so the DN
> keeps a lingering connection open to the NN. Connection caching is in part
> based on UGI. Although the client used the same token for the new offset
> request, the UGI is different which forces the DN to open another unnecessary
> connection to the NN.
> A job that performs many seeks will easily crash the NN due to fd exhaustion.
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