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Posted to hdfs-issues@hadoop.apache.org by "Manoj Govindassamy (JIRA)" <ji...@apache.org> on 2017/04/28 18:48:04 UTC
[jira] [Updated] (HDFS-11718) DFSStripedOutputStream hsync/hflush
should not throw UnsupportedOperationException
[ https://issues.apache.org/jira/browse/HDFS-11718?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Manoj Govindassamy updated HDFS-11718:
--------------------------------------
Description:
This is a clone bug of HDFS-11644 to provide a quick fix while a proper fix is being discussed and developed. The quick fix here would be to just turn {{DFSStripedOutputStream#hsync()/hflush()}} as a no-op instead of throwing UnsupportedOperationException.
@Override
public void hflush() {
throw new UnsupportedOperationException();
}
@Override
public void hsync() {
throw new UnsupportedOperationException();
}
For more details please refer to the comments in HDFS-11644.
was:
FSDataOutputStream#hsync checks if a stream implements Syncable, and if so, calls hsync. Otherwise, it just calls flush. This is used, for instance, by YARN's FileSystemTimelineWriter.
DFSStripedOutputStream extends DFSOutputStream, which implements Syncable. However, DFSStripedOS throws a runtime exception when the Syncable methods are called.
We should refactor the inheritance structure so DFSStripedOS does not implement Syncable.
> DFSStripedOutputStream hsync/hflush should not throw UnsupportedOperationException
> ----------------------------------------------------------------------------------
>
> Key: HDFS-11718
> URL: https://issues.apache.org/jira/browse/HDFS-11718
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: erasure-coding
> Affects Versions: 3.0.0-alpha1
> Reporter: Manoj Govindassamy
> Assignee: Manoj Govindassamy
> Priority: Blocker
> Labels: hdfs-ec-3.0-must-do
>
> This is a clone bug of HDFS-11644 to provide a quick fix while a proper fix is being discussed and developed. The quick fix here would be to just turn {{DFSStripedOutputStream#hsync()/hflush()}} as a no-op instead of throwing UnsupportedOperationException.
> @Override
> public void hflush() {
> throw new UnsupportedOperationException();
> }
> @Override
> public void hsync() {
> throw new UnsupportedOperationException();
> }
> For more details please refer to the comments in HDFS-11644.
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