[issue9205] Parent process hanging in multiprocessing if children terminate unexpectedly

2011-03-08 Thread Qiangning Hong 

Changes by Qiangning Hong :


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nosy: +hongqn

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[issue2277] MozillaCookieJar does not support Firefox3 cookie files

2008-06-20 Thread Qiangning Hong 

Changes by Qiangning Hong <[EMAIL PROTECTED]>:


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nosy: +hongqn

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[issue1722344] Thread shutdown exception in Thread.notify()

2009-01-26 Thread Qiangning Hong 

Changes by Qiangning Hong :


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nosy: +hongqn

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[issue4947] sys.stdout fails to use default encoding as advertised

2009-02-04 Thread Qiangning Hong 

Changes by Qiangning Hong :


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nosy: +hongqn

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[issue14562] urllib2 maybe blocks too long with small chunks

2012-04-15 Thread Qiangning Hong 

Changes by Qiangning Hong :


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nosy: +hongqn

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[issue19224] Make hash(None) consistent among processes

2013-10-10 Thread Qiangning Hong 

Changes by Qiangning Hong :


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keywords: +patch
Added file: http://bugs.python.org/file32043/hash_of_none.patch

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[issue19224] Make hash(None) consistent among processes

2013-10-10 Thread Qiangning Hong 

New submission from Qiangning Hong:

Integers, strings, and bool's hash are all consistent for processes of a same 
interpreter.  However, hash(None) differs.

$ python -c "print(hash(None))"
272931276
$ python -c "print(hash(None))"
277161420

It's wired and make difficulty for distributed systems partitioning data 
according hash of keys if the system wants the keys support None.

This patch makes hash(None) always return 0 to resolve that problem.  And it is 
used in DPark(Python clone of Spark, a MapReduce alike framework in Python, 
https://github.com/douban/dpark) to speed up portable hash (see line 
https://github.com/douban/dpark/blob/65a3ba857f11285667c61e2e134dacda44c13a2c/dpark/util.py#L47).

davies@gmail.com is the original author of this patch.  All credit goes to 
him.

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messages: 199439
nosy: hongqn
priority: normal
severity: normal
status: open
title: Make hash(None) consistent among processes

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[issue19224] Make hash(None) consistent among processes

2013-10-10 Thread Qiangning Hong 

Qiangning Hong added the comment:

Return 1315925605 now :)

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Added file: http://bugs.python.org/file32044/hash_of_none.patch

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