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https://issues.apache.org/jira/browse/HDFS-12748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16875343#comment-16875343
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Weiwei Yang commented on HDFS-12748:
------------------------------------
Hi [~xkrogen]
Thanks for helping to review this, and sorry about the late response. I got
pinged internally and users are running into this issue too. Let's work
together to get this fixed.
Your comments make sense to me, I have fixed both of them in v4 patch except
the first
{quote}I think rather than having a possibility of a null configuration and
thus requiring a null check, it would be simpler to just supply a default conf
object like what is done now.
{quote}
Are you suggesting we should have the null check before calling
{{DFSUtilClient#getHomeDirectory}}? Why that is simpler?
Thanks
> 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
> Attachments: HDFS-12748.001.patch, HDFS-12748.002.patch,
> HDFS-12748.003.patch, HDFS-12748.004.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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