[SERVER-52919] Wire compression not enabled for initial sync Created: 17/Nov/20 Updated: 29/Oct/23 Resolved: 19/Dec/20 |
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| Status: | Closed |
| Project: | Core Server |
| Component/s: | None |
| Affects Version/s: | 4.4.1, 4.2.10 |
| Fix Version/s: | 4.9.0, 4.2.12, 4.4.4 |
| Type: | Bug | Priority: | Major - P3 |
| Reporter: | Bruce Lucas (Inactive) | Assignee: | Amirsaman Memaripour |
| Resolution: | Fixed | Votes: | 2 |
| Labels: | sa-groomed | ||
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Attachments: |
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| Issue Links: |
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| Backwards Compatibility: | Fully Compatible | ||||||||||||||||||||
| Operating System: | ALL | ||||||||||||||||||||
| Backport Requested: |
v4.4, v4.2
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| Sprint: | Service arch 2020-12-28 | ||||||||||||||||||||
| Participants: | |||||||||||||||||||||
| Linked BF Score: | 0 | ||||||||||||||||||||
| Description |
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Initial sync for identical highly compressible data sets on 4.0, 4.2, 4.4:
Total bytes transferred ("InOctets") is much higher for 4.4 and 4.2 than 4.0, and snappy decompressor metrics show that compression is not being used. Impact on performance is not certain as I'm not sure whether this test is limited by network bandwidth, but if it is impacting performance, then
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| Comments |
| Comment by Ian Whalen (Inactive) [ 04/Jan/21 ] |
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Author: {'username': u'evrg-bot-webhook', 'name': u'Amirsaman Memaripour', 'email': u'amirsaman.memaripour@mongodb.com'}Message: |
| Comment by Ian Whalen (Inactive) [ 04/Jan/21 ] |
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Author: {'username': u'evrg-bot-webhook', 'name': u'Amirsaman Memaripour', 'email': u'amirsaman.memaripour@mongodb.com'}Message: (cherry picked from commit 762eb95cd160aab9bec295b1e46d3c9a8ab505e2) |
| Comment by Ian Whalen (Inactive) [ 04/Jan/21 ] |
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Author: {'username': u'evrg-bot-webhook', 'name': u'Amirsaman Memaripour', 'email': u'amirsaman.memaripour@mongodb.com'}Message: (cherry picked from commit 762eb95cd160aab9bec295b1e46d3c9a8ab505e2) |
| Comment by Suganthi Mani [ 19/Nov/20 ] |
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I think I know the reason why we are not compressing the initial sync data on 4.2+. It seems like a side-effect of initial sync using exhaust cursor. Since this a bug in exhaust cursor, even oplog fetcher (PM-1232 which landed in 4.4) is also affected. |