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https://issues.apache.org/jira/browse/HADOOP-13264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15328453#comment-15328453
]
Arpit Agarwal commented on HADOOP-13264:
----------------------------------------
Test code from [~sebyonthenet] (moving from description)
{code}
Here is a test program:
public static void main(String args[]) throws Exception
{
final Configuration conf = new Configuration();
conf.addResource(new FileInputStream(new
File("core-site.xml")));
conf.addResource(new FileInputStream(new
File("hdfs-site.xml")));
final DistributedFileSystem newFileSystem =
(DistributedFileSystem)FileSystem.get(conf);
OutputStream outputStream = null;
try
{
outputStream = newFileSystem.create(new
Path("/user/ssmogos", "test1"));
outputStream.write("test".getBytes());
}
catch (IOException e)
{
e.printStackTrace();//don't care about this
}
finally
{
try
{
if (outputStream != null)
outputStream.close();//now this one
will fail to close the stream
}
catch (IOException e)
{
e.printStackTrace();//this will list the thrown
exception from DFSOutputStream->flushInternal->checkClosed
//TODO the
DFSOutputStream#close->dfsClient.endFileLease(fileId) is never getting closed
}
}
Field field =
DFSClient.class.getDeclaredField("filesBeingWritten");
field.setAccessible(true);
System.out.print("THIS SHOULD BE EMPTY: " +
field.get(newFileSystem.getClient()));
{code}
> Hadoop HDFS - DFSOutputStream close method fails to clean up resources in
> case no hdfs datanodes are accessible
> ----------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-13264
> URL: https://issues.apache.org/jira/browse/HADOOP-13264
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.7.2
> Reporter: Seb Mo
>
> Using:
> hadoop-hdfs\2.7.2\hadoop-hdfs-2.7.2-sources.jar!\org\apache\hadoop\hdfs\DFSOutputStream.java
> Close method fails when the client can't connect to any data nodes. When
> re-using the same DistributedFileSystem in the same JVM, if all the datanodes
> can't be accessed, then this causes a memory leak as the
> DFSClient#filesBeingWritten map is never cleared after that.
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