Change ThreadPool and Worker class in thread_pool.py #628
Conversation
minio/thread_pool.py
Outdated
| def __init__(self, num_threads): | ||
| self.results_queue = queue() | ||
| self.exceptions_queue = queue() | ||
| self.tasks_queue = queue(num_threads) |
There was a problem hiding this comment.
@nnehdi you need to remove queue size restriction here.. otherwise multipart PUT won't work. The reason is that the code in this PR will fill tasks_queue with all tasks before starting to execute them.
There was a problem hiding this comment.
I've tested the existing code (without @vadmeste's suggested correction above) and verified that multi-part uploads fails when more than num_threads parts are involved in the multi-part upload. That is, when the tasks-queue size is limited with num_threads, 3 in our case, the multi-part upload hangs with files bigger than 15MB (3 x 5MB - multi-part size limit) since tasks_queue gets full after 3rd part is tasks_queue.put in and the tasks_queue.put action for the 4th part blocks the operation.
So, we should not limit the size of the tasks-queue :
self.tasks_queue = queue(num_threads) => self.tasks_queue = queue()
There was a problem hiding this comment.
@ebozduman @vadmeste I agree with you, I did not consider that. As @ebozduman said we should remove the limit of queue size because we put all chunks of a file before we start the Worker threads.
thank you, guys.
minio/thread_pool.py
Outdated
| self.results_queue = results_queue | ||
| self.exceptions_queue = exceptions_queue | ||
| self.daemon = True | ||
| self.daemon = False |
There was a problem hiding this comment.
Why do we turn off daemon mode, self.daemon = False ?
There was a problem hiding this comment.
It depends on your situation. In our use case, we want to close the thread immediately after the program stopped and it's not important for us to miss an uploading file. I change this flag to its previous value (True) but It's better to have a config that user can change this flag depends on their situation when using py-mino.
tnx
There was a problem hiding this comment.
@nnehdi,
Thank you very much for working on this fix.
Are you going to push these review comment changes, so that we can merge and close the PR?
Change Worker daemon field to True. remove queue self.task_queue size restriction in ThreadPool class. Fixes minio#595
minio/thread_pool.py
Outdated
| if not self.exceptions_queue.empty(): | ||
| raise self.exceptions_queue.get() | ||
|
|
||
|
|
There was a problem hiding this comment.
Could you also clean up these last 2 extra lines introduced?
minio/thread_pool.py
Outdated
| if not self.exceptions_queue.empty(): | ||
| raise self.exceptions_queue.get() | ||
|
|
||
|
|
There was a problem hiding this comment.
Could you also clean up these last 2 extra space lines introduced?
minio/thread_pool.py
Outdated
| def run(self): | ||
| fast_quit = False | ||
| while True: | ||
|
|
There was a problem hiding this comment.
We don't need this extra line.
minio/thread_pool.py
Outdated
| """ Return the result of all called tasks """ | ||
| return self.results_queue | ||
|
|
||
|
|
There was a problem hiding this comment.
We don't need this extra line.
Could you also squash when you are done.
6 participants
Fixes #595