Details
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Bug
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Resolution: Cannot Reproduce
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Major - P3
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None
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2.1.1
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ALL
Description
Results of migration one chunk (default size: 64mb), collection with 180 million of rows
by {_id}: ~ 245 secs
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by {key}: ~ 570 secs
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by {key, _id}: ~1100 secs
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where
_id - ObjectId
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key - 32 chars - md5 hash
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Using next configuration
3.75 GB memory
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2 EC2 Compute Unit (1 virtual core with 2 EC2 Compute Unit)
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410 GB instance storage
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32-bit or 64-bit platform
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I/O Performance: Moderate
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API name: m1.medium
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Even in the best case it is slow (245 secs)
No concurrent read/write to database, just sharding
"removeshard" is also not so fast
Attach logs (iostat, mongostat, mongotop, vmstat, at some tests have mongo
{db,s}logs)
Related links:
https://groups.google.com/d/msg/mongodb-user/ziPjlJIS5_w/WMG3iZSuB6kJ
https://groups.google.com/d/msg/mongodb-user/R7XS1tDME8g/ucQR63ixmy0J