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Type:
Improvement
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Resolution: Unresolved
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: None
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Query Execution
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This is going to be tricky due to the observed problem below.
Original Title
Failure to allocate Snapshot ID slot for FETCH above COLUMN_SCAN
Original Description
I've observed this kind of failure in some of the passthrough suites which execute the columnstore index tests in a sharded cluster:
[js_test:columnstore_eligibility] uncaught exception: Error: command failed: {
[js_test:columnstore_eligibility] "ok" : 0,
[js_test:columnstore_eligibility] "errmsg" : "Snapshot id slot is not defined",
[js_test:columnstore_eligibility] "code" : 5290701,
[js_test:columnstore_eligibility] "codeName" : "Location5290701",
[js_test:columnstore_eligibility] "$clusterTime" : {
[js_test:columnstore_eligibility] "clusterTime" : Timestamp(1651843587, 40),
[js_test:columnstore_eligibility] "signature" : {
[js_test:columnstore_eligibility] "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
[js_test:columnstore_eligibility] "keyId" : NumberLong(0)
[js_test:columnstore_eligibility] }
[js_test:columnstore_eligibility] },
[js_test:columnstore_eligibility] "operationTime" : Timestamp(1651843587, 40)
[js_test:columnstore_eligibility] } with original command request: {
[js_test:columnstore_eligibility] "aggregate" : "columnstore_eligibility",
[js_test:columnstore_eligibility] "pipeline" : [
[js_test:columnstore_eligibility] {
[js_test:columnstore_eligibility] "$group" : {
[js_test:columnstore_eligibility] "_id" : "$a"
[js_test:columnstore_eligibility] }
[js_test:columnstore_eligibility] }
[js_test:columnstore_eligibility] ],
[js_test:columnstore_eligibility] "explain" : true,
[js_test:columnstore_eligibility] "cursor" : {
[js_test:columnstore_eligibility]
[js_test:columnstore_eligibility] },
This kind of plan should be rare but is possible for now until we do SERVER-65466. It will also be possible if the columnstore index was hinted after SERVER-62985 is merged.
- depends on
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SERVER-62985 Change query planner to generate column index plans when hinted
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- Closed
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- is related to
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- Closed
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- Closed
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