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https://issues.apache.org/jira/browse/HDFS-16906?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDFS-16906:
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Labels: pull-request-available (was: )
> CryptoOutputStream::close leak when encrypted zones + quota exceptions
> ----------------------------------------------------------------------
>
> Key: HDFS-16906
> URL: https://issues.apache.org/jira/browse/HDFS-16906
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: dfsclient
> Affects Versions: 3.3.1, 3.3.2, 3.3.3, 3.3.4
> Reporter: Colm Dougan
> Assignee: Colm Dougan
> Priority: Critical
> Labels: pull-request-available
> Attachments: hadoop_cryto_stream_close_try_finally.diff
>
>
> {color:#172b4d}I would like to report an issue with a resource leak
> ({color}DFSOutputStream objects) when using the (java) hadoop-hdfs-client
> And specifically (at least in my case) when there is a combination of:
> * encrypted zones
> * quota space exceptions (DSQuotaExceededException)
> As you know, when encrypted zones are in play, when calling fs.create(path)
> in the hadoop-hdfs-client it will return a HdfsDataOutputStream stream object
> which wraps a CryptoOutputStream object which then wraps a DFSOutputStream
> object.
> Even though my code is correctly calling stream.close() on the above I can
> see from debugging that the underlying DFSOutputStream objects are being
> leaked.
> Specifically I see the DFSOutputStream objects being leaked in the
> filesBeingWritten map in DFSClient. (i.e. the DFSOutputStream objects remain
> in the map even though I've called close() on the stream object).
> I suspect this is due to a bug in CryptoOutputStream::close
> {code:java}
> @Override
>
> public synchronized void close() throws IOException {
>
> if (closed) {
>
> return;
>
> }
>
> try {
>
> flush();
>
> if (closeOutputStream) {
>
> super.close();
>
> codec.close();
>
> }
>
> freeBuffers();
>
> } finally {
>
> closed = true;
>
> }
>
> }{code}
> ... whereby if flush() throws (observed in my case when a
> DSQuotaExceededException exception is thrown due to quota exceeded) then the
> super.close() on the underlying DFSOutputStream is skipped.
> In my case I had a space quota set up on a given directory which is also in
> an encrypted zone and so each attempt to create and write to a file failed
> and leaked as above.
> I have attached a speculative patch
> ([^hadoop_cryto_stream_close_try_finally.diff]) which simply wraps the
> flush() in a try .. finally. The patch resolves the problem in my testing.
> Thanks.
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