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From Flavio Pompermaier <pomperma...@okkam.it>
Subject Re: HDFS directory rename
Date Wed, 22 Jul 2015 11:10:08 GMT
I can detect if it's a dir but how can I detect if it's empty?

On Wed, Jul 22, 2015 at 12:49 PM, Fabian Hueske <fhueske@gmail.com> wrote:

> How about FileStatus[] FileSystem.listStatus()?
> FileStatus gives the length of a file, the path, whether it's a dir, etc.
>
> 2015-07-22 11:04 GMT+02:00 Flavio Pompermaier <pompermaier@okkam.it>:
>
>> Ok. What I still not able to do is to recursively remove empty dirs from
>> the source dir because there's no API for getChildrenCount() or
>> getChildren() for a given Path.
>> How can I do that?
>>
>> On Tue, Jul 21, 2015 at 3:13 PM, Stephan Ewen <sewen@apache.org> wrote:
>>
>>> I don't think there is a simpler way to do this.
>>>
>>> Flink follows the semantics of the Hadoop's HDFS file system there,
>>> which behaves that way, and the Java File class.
>>>
>>> But it seems your solution is working, even if it needs a few extra
>>> lines of code.
>>>
>>> On Fri, Jul 17, 2015 at 11:17 AM, Flavio Pompermaier <
>>> pompermaier@okkam.it> wrote:
>>>
>>>> Of course I move the folder before the job starts or ends :)
>>>> My job does some transformation on the row data and put the results in
>>>> another folder.
>>>> The next time the job is executed checks whether the output folder
>>>> exists and, if so, it moves such folder to an archive dir.
>>>> I wanted to use the Flink client because is FS independent, so I can
>>>> choose which FS to use at runtime.
>>>> At the moment what I do is:
>>>>
>>>> Path dataSourceArchivePath = new Path(rowChunksArchiveBaseDir,
>>>> dataSourceId);
>>>>
>>>> dataSourceArchivePath.getFileSystem().mkdirs(dataSourceArchivePath.getParent());
>>>> boolean moved =
>>>> dataSourceArchivePath.getFileSystem().rename(dataSourceDirPath,
>>>> dataSourceArchivePath.getParent());
>>>> LOG.info("Archiving {} to {} {}",
>>>> dataSourceDirPath,dataSourceArchivePath, moved ? "successful" : "failed");
>>>>
>>>> Moreover I still have to delete the empty subPaths of
>>>> the dataSourceArchivePath after the move but I can't do that because
>>>> there's no listChildren() on the Path object :(
>>>> I was looking for a simpler way to do this. Does it exists?
>>>>
>>>> On Fri, Jul 17, 2015 at 10:08 AM, <fhueske@gmail.com> wrote:
>>>>
>>>>>  Do you want to move the folder within a running job? This might
>>>>> cause a lot of problems, because you cannot (easily) control when a move
>>>>> command would be executed.
>>>>>
>>>>> Wouldn’t it be a better idea to do that after a job is finished and
>>>>> use the regular HDFS client?
>>>>>
>>>>> *From:* Flavio Pompermaier <pompermaier@okkam.it>
>>>>> *Sent:* ‎Friday‎, ‎17‎. ‎July‎, ‎2015 ‎10‎:‎02
>>>>> *To:* user@flink.apache.org
>>>>>
>>>>> Hi to all,
>>>>>
>>>>> in my Flink job I wanted to move a folder (containing other folders
>>>>> and files) to another location.
>>>>> For example, I wanted to move folder A to folder Y, where my HDFS
>>>>> looks like:
>>>>>
>>>>> myRootDir/X/a/aa/aaa/someFile1
>>>>> myRootDir/X/b/bb/bbb/someFile2
>>>>> myRootDir/Y
>>>>>
>>>>> I tried to use rename but it silently fails (rename just returns
>>>>> false) if the parent directory doesn't exists.
>>>>> Is there an easy way to do that with the Flink FS apis?
>>>>> If the rename() is intended to work that way, couldn't be useful a
>>>>> move() API..?
>>>>>
>>>>> Best,
>>>>> Flavio
>>>>>
>>>>>
>>>>
>>>>
>>>
>>
>


-- 

Flavio Pompermaier

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