Waiting for read-lock on file: Difference between revisions

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[[Category: CASA Basics]]
[[Category: CASA Basics]]
{{Getting Started Intro}}
{{Using CASA Hints Tips Tricks}}


You might come across an error that looks like this:
You might come across an error that looks like this:
Line 8: Line 8:
And no tasks will operate within CASA on the .ms file anymore. Quitting out and restarting CASA doesn't seem to help.  
And no tasks will operate within CASA on the .ms file anymore. Quitting out and restarting CASA doesn't seem to help.  


Right now, the suggested fix for this is to just delete the table.lock file in your .ms directory. Here is the '''pythonic''' way to get rid of table-lock files in the present directory and subdirectories. Use the following code with caution!
Right now, the suggested fix for this is to try a clearstat:
<source lang="python">
clearstat
</source>
Sometimes typing this multiple times can help make sure the table is really unlocked.
 
In extreme cases, you might have to just delete the table.lock file manually in your .ms directory. Here is the '''pythonic''' way to get rid of table-lock files in the present directory and subdirectories. Use the following code with caution!


<source lang="python">
<source lang="python">
Line 17: Line 23:
</source>
</source>


Last checked on CASA Version 3.0.0 (r9860).
 
== Which process is locking the file? ==
 
It is possible to find the process holding the lock with the following command:
 
<source lang="python">
  showtablelock tablename
</source>
 
If the table is locked, it tells which pid holds the lock. Thereafter ''ps'' can tell you exactly what process it is and you can decide if it needs to be ended or killed.
 
 
 
{{Checked 3.0.0}}
 


--[[User:Lchomiuk|Laura Chomiuk]] 20:03, 18 February 2010 (UTC)
--[[User:Lchomiuk|Laura Chomiuk]] 20:03, 18 February 2010 (UTC)

Revision as of 06:18, 29 November 2011

Hints, Tips, and Tricks

You might come across an error that looks like this:

2010-02-18 01:08:42 INFO listobs    Process 21666: waiting for read-lock on file .../Leo/leo1.ms/table.lock

And no tasks will operate within CASA on the .ms file anymore. Quitting out and restarting CASA doesn't seem to help.

Right now, the suggested fix for this is to try a clearstat:

clearstat

Sometimes typing this multiple times can help make sure the table is really unlocked.

In extreme cases, you might have to just delete the table.lock file manually in your .ms directory. Here is the pythonic way to get rid of table-lock files in the present directory and subdirectories. Use the following code with caution!

import os
for root, dirs, files in os.walk('./'):
    for name in files:
        if name == 'table.lock': os.remove(os.path.join(root,name))


Which process is locking the file?

It is possible to find the process holding the lock with the following command:

   showtablelock tablename

If the table is locked, it tells which pid holds the lock. Thereafter ps can tell you exactly what process it is and you can decide if it needs to be ended or killed.


Last checked on CASA Version 3.0.0 (r9860).


--Laura Chomiuk 20:03, 18 February 2010 (UTC)