[SERVER-27446] operation_latency_histogram.js fails in initial sync passthrough due to reads performed by the repl system Created: 16/Dec/16 Updated: 05/Apr/17 Resolved: 16/Dec/16 |
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| Status: | Closed |
| Project: | Core Server |
| Component/s: | Querying, Replication |
| Affects Version/s: | None |
| Fix Version/s: | 3.4.2, 3.5.2 |
| Type: | Bug | Priority: | Major - P3 |
| Reporter: | David Storch | Assignee: | David Storch |
| Resolution: | Done | Votes: | 0 |
| Labels: | None | ||
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Issue Links: |
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| Backwards Compatibility: | Fully Compatible | ||||||||||||||||
| Operating System: | ALL | ||||||||||||||||
| Backport Requested: |
v3.4
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| Sprint: | Query 2017-01-23 | ||||||||||||||||
| Participants: | |||||||||||||||||
| Linked BF Score: | 0 | ||||||||||||||||
| Description |
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The operation_latency_histogram.js integration test makes assertions about the number of read and write operations performed against a particular collection in order to test the new latencyStats() feature available in version 3.4. In particular, it writes to a collection and ensures the latency stats reflect the correct count of write operations, but that the number of read operations has not changed (aside from the read done to retrieve the latency stats themselves). The assumption that the number of read operations has not changed, however, is invalid in our initial sync passthrough suite, core_small_oplog_rs_initsync. When an initial sync occurs during the execution of the test, the downstream node will issue a find command against its sync source in order to clone the data. From the sync source's perspective, this read looks just like any user-issued find, and it will be counted by the operation latency histogram. This causes the read count to be higher than expected by the test. |
| Comments |
| Comment by Githook User [ 21/Dec/16 ] |
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Author: {u'username': u'dstorch', u'name': u'David Storch', u'email': u'david.storch@10gen.com'}Message: (cherry picked from commit 530418b23c4c9d45cde993853967fe1b7b636c47) |
| Comment by Githook User [ 16/Dec/16 ] |
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Author: {u'username': u'dstorch', u'name': u'David Storch', u'email': u'david.storch@10gen.com'}Message: |