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Type:
Improvement
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Resolution: Unresolved
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Priority:
Major - P3
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None
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Affects Version/s: None
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Component/s: None
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Labels:
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Query Execution
The logv2 format each log entry as a single line JSON object. When the log entry is supposed to be a multi-line message, they are not human readable. Maybe we can use the old log format here.
Sample error log by query_planner_test_fixture.cpp
{"t":{"$date":"2020-04-28T11:04:35.204Z"},"s":"E", "c":"TEST", "id":23070, "ctx":"main","msg":"Throwing exception","attr":{"exception":"expected 1 matches for solution {fetch: {node: {mergeSort: {nodes: [{fetch: {filter: {b: 1}, node: {ixscan: {pattern: {a: 1}, dir: 1}}}}, {ixscan: {pattern: {a: 1}, dir: 1}}]}}}} but got 0 instead. all solutions generated: \nFETCH\n---fetched = 1\n---sortedByDiskLoc = 0\n---providedSorts = {baseSortPattern: { a: -1 }, ignoredFields: []}\n---Child:\n------MERGE_SORT\n---------fetched = 0\n---------sortedByDiskLoc = 0\n---------providedSorts = {baseSortPattern: { a: -1 }, ignoredFields: []}\n---------Child 0:\n------------FETCH\n---------------filter:\n b $eq 1\n---------------fetched = 1\n---------------sortedByDiskLoc = 1\n---------------providedSorts = {baseSortPattern: {}, ignoredFields: [a]}\n---------------Child:\n------------------IXSCAN\n---------------------indexName = hari_king_of_the_stove\nkeyPattern = { a: 1 }\n---------------------direction = 1\n---------------------bounds = field #0['a']: [1, 1]\n---------------------fetched = 0\n---------------------sortedByDiskLoc = 1\n---------------------providedSorts = {baseSortPattern: {}, ignoredFields: [a]}\n\n---------Child 1:\n------------IXSCAN\n---------------indexName = hari_king_of_the_stove\nkeyPattern = { a: 1 }\n---------------direction = -1\n---------------bounds = field #0['a']: (0, -inf.0]\n---------------fetched = 0\n---------------sortedByDiskLoc = 0\n---------------providedSorts = {baseSortPattern: { a: -1 }, ignoredFields: []}\n\n\nSORT\n---type = SIMPLE\n---pattern = { a: -1 }\n---limit = 0\n---fetched = 1\n---sortedByDiskLoc = 0\n---providedSorts = {baseSortPattern: {}, ignoredFields: []}\n---Child:\n------COLLSCAN\n---------ns = test.collection\n---------filter = $or\n $and\n a $eq 1\n b $eq 1\n a $lt 0\n---------fetched = 1\n---------sortedByDiskLoc = 0\n---------providedSorts = {baseSortPattern: {}, ignoredFields: []}\n\n @src/mongo/db/query/query_planner_test_fixture.cpp:521"}}
{"t":{"$date":"2020-04-28T11:04:35.205Z"},"s":"I", "c":"TEST", "id":4680100, "ctx":"main","msg":"FAIL","attr":{"test":"MergeSortReverseScans","type":"TestAssertionFailureException","error":"expected 1 matches for solution {fetch: {node: {mergeSort: {nodes: [{fetch: {filter: {b: 1}, node: {ixscan: {pattern: {a: 1}, dir: 1}}}}, {ixscan: {pattern: {a: 1}, dir: 1}}]}}}} but got 0 instead. all solutions generated: \nFETCH\n---fetched = 1\n---sortedByDiskLoc = 0\n---providedSorts = {baseSortPattern: { a: -1 }, ignoredFields: []}\n---Child:\n------MERGE_SORT\n---------fetched = 0\n---------sortedByDiskLoc = 0\n---------providedSorts = {baseSortPattern: { a: -1 }, ignoredFields: []}\n---------Child 0:\n------------FETCH\n---------------filter:\n b $eq 1\n---------------fetched = 1\n---------------sortedByDiskLoc = 1\n---------------providedSorts = {baseSortPattern: {}, ignoredFields: [a]}\n---------------Child:\n------------------IXSCAN\n---------------------indexName = hari_king_of_the_stove\nkeyPattern = { a: 1 }\n---------------------direction = 1\n---------------------bounds = field #0['a']: [1, 1]\n---------------------fetched = 0\n---------------------sortedByDiskLoc = 1\n---------------------providedSorts = {baseSortPattern: {}, ignoredFields: [a]}\n\n---------Child 1:\n------------IXSCAN\n---------------indexName = hari_king_of_the_stove\nkeyPattern = { a: 1 }\n---------------direction = -1\n---------------bounds = field #0['a']: (0, -inf.0]\n---------------fetched = 0\n---------------sortedByDiskLoc = 0\n---------------providedSorts = {baseSortPattern: { a: -1 }, ignoredFields: []}\n\n\nSORT\n---type = SIMPLE\n---pattern = { a: -1 }\n---limit = 0\n---fetched = 1\n---sortedByDiskLoc = 0\n---providedSorts = {baseSortPattern: {}, ignoredFields: []}\n---Child:\n------COLLSCAN\n---------ns = test.collection\n---------filter = $or\n $and\n a $eq 1\n b $eq 1\n a $lt 0\n---------fetched = 1\n---------sortedByDiskLoc = 0\n---------providedSorts = {baseSortPattern: {}, ignoredFields: []}\n\n @src/mongo/db/query/query_planner_test_fixture.cpp:521","extra":"BACKTRACE: {\"backtrace\":[{\"a\":\"7F3468AD12E6\",\"b\":\"7F346851D000\",\"o\":\"5B42E6\",\"s\":\"_ZN5mongo18stack_trace_detail12_GLOBAL__N_122LibunwindStepIte