hdfview 2.11 locks SWMR files

[help at hdfgroup.org]

Hi Jan,

You can use the h5clear -s utility to remove the flag.
I should have mentioned that!

-Barbara


On Fri, 16 Feb 2018, Kotanski, Jan wrote:

> Hi Barbara,
>
> Is there any way to rescue (i.e. unlock) the files broken by hdfview,
> e.g. a script which unlocks the file?
>
> If not we have to forbid our user to use the hdfview (or do not use SWMR).
> They don't know a priori if the file was created with SWMR or not.
> And if they cannot unlock broken files they loose their data.
>
> Best regards,
> Jan
>
> ----- Original Message -----
> From: help at hdfgroup.org
> To: "Jan Kotanski" <jan.kotanski at desy.de>
> Cc: debian-science-maintainers at lists.alioth.debian.org
> Sent: Friday, 16 February, 2018 16:49:46
> Subject: Re: hdfview 2.11 locks SWMR files
>
> Hi Jan,
>
> HDFView 2.11 is based on HDF5-1.8 with 32-bit object identifiers. SWMR is a new
> feature in HDF5-1.10 (which has 64-bit object identifiers).
>
> HDFView 3.0 (Beta) supports HDF5-1.10. However, even if you use it and select
> "File->Open", it gets a lock on the file and it modifies it. We are working on
> resolving this issue for the release version of HDFView 3.0 due out later this
> year (after HDF5-1.10.2).
>
> As a workaround, we believe you should be able to use HDFView 3.0 (Beta) to open
> the file if you select "File->Open Read-Only".
>
> -Barbara
>
> ========================================================
> Barbara Jones, The HDF Group Helpdesk, help at hdfgroup.org
> Support Services:  https://www.hdfgroup.org/solutions/
> ========================================================
>
> On Fri, 16 Feb 2018, Jan Kotanski wrote:
>
>> Dear HDFView Maintainers,
>>
>> I've just accounted problems in reading SWMR files with hdfview 2.11 on debian stretch.
>>
>> The hdfview 2.11 not only cannot read the SWMR files but it breaks them, i.e. set a lock inside the files,
>> and the files are no more readable.
>>
>> For example I create a file
>>
>>    http://www.desy.de/~jkotan/swmr/swmr.h5
>>
>> with:
>>
>>    http://www.desy.de/~jkotan/swmr/writer2dattr.py
>>
>> Normally, I can read it on stretch with:
>>
>>    http://www.desy.de/~jkotan/swmr/reader2d.py
>>
>>
>> But after I run:
>>
>> jkotan at stretch-jk:~/sources/lavue/nxstest$ hdfview swmr.h5
>>
>> I get:
>>
>> jkotan at stretch-jk:~/sources/lavue/nxstest$ python reader2d.py
>> Traceback (most recent call last):
>>  File "reader2d.py", line 4, in <module>
>>    f = h5py.File("swmr.h5", 'r', libver='latest', swmr=True)
>>  File "/usr/lib/python2.7/dist-packages/h5py/_hl/files.py", line 271, in __init__
>>    fid = make_fid(name, mode, userblock_size, fapl, swmr=swmr)
>>  File "/usr/lib/python2.7/dist-packages/h5py/_hl/files.py", line 101, in make_fid
>>    fid = h5f.open(name, flags, fapl=fapl)
>>  File "h5py/_objects.pyx", line 54, in h5py._objects.with_phil.wrapper (/build/h5py-b1xqNM/h5py-2.7.0/h5py/_objects.c:2842)
>>  File "h5py/_objects.pyx", line 55, in h5py._objects.with_phil.wrapper (/build/h5py-b1xqNM/h5py-2.7.0/h5py/_objects.c:2800)
>>  File "h5py/h5f.pyx", line 78, in h5py.h5f.open (/build/h5py-b1xqNM/h5py-2.7.0/h5py/h5f.c:2127)
>> IOError: Unable to open file (File is not already open for swmr writing)
>>
>>
>> Thus, the hdfview breaks the file and the SWMR file is not more readable.
>>
>>
>> Is it possible to provide backports for the hdfview package with the version which fix the above problem
>>   (hope the newer version, e.g. 3.0.0 fix this problem)?
>>
>>
>> Best regards,
>> Jan
>>
>
> --
>

--