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https://issues.apache.org/jira/browse/HDFS-12748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16878548#comment-16878548
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Hudson commented on HDFS-12748:
-------------------------------
FAILURE: Integrated in Jenkins build Hadoop-trunk-Commit #16861 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/16861/])
HDFS-12748. NameNode memory leak when accessing webhdfs (wwei: rev
729cb3aefe71d7f728c7edea78ce7f268a1fdecb)
* (edit)
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSUtilClient.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/web/resources/NamenodeWebHdfsMethods.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java
> NameNode memory leak when accessing webhdfs GETHOMEDIRECTORY
> ------------------------------------------------------------
>
> Key: HDFS-12748
> URL: https://issues.apache.org/jira/browse/HDFS-12748
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs
> Affects Versions: 2.8.2
> Reporter: Jiandan Yang
> Assignee: Weiwei Yang
> Priority: Major
> Fix For: 3.3.0
>
> Attachments: HDFS-12748.001.patch, HDFS-12748.002.patch,
> HDFS-12748.003.patch, HDFS-12748.004.patch, HDFS-12748.005.patch
>
>
> In our production environment, the standby NN often do fullgc, through mat we
> found the largest object is FileSystem$Cache, which contains 7,844,890
> DistributedFileSystem.
> By view hierarchy of method FileSystem.get() , I found only
> NamenodeWebHdfsMethods#get call FileSystem.get(). I don't know why creating
> different DistributedFileSystem every time instead of get a FileSystem from
> cache.
> {code:java}
> case GETHOMEDIRECTORY: {
> final String js = JsonUtil.toJsonString("Path",
> FileSystem.get(conf != null ? conf : new Configuration())
> .getHomeDirectory().toUri().getPath());
> return Response.ok(js).type(MediaType.APPLICATION_JSON).build();
> }
> {code}
> When we close FileSystem when GETHOMEDIRECTORY, NN don't do fullgc.
> {code:java}
> case GETHOMEDIRECTORY: {
> FileSystem fs = null;
> try {
> fs = FileSystem.get(conf != null ? conf : new Configuration());
> final String js = JsonUtil.toJsonString("Path",
> fs.getHomeDirectory().toUri().getPath());
> return Response.ok(js).type(MediaType.APPLICATION_JSON).build();
> } finally {
> if (fs != null) {
> fs.close();
> }
> }
> }
> {code}
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