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Posted to oak-issues@jackrabbit.apache.org by "Marcel Reutegger (JIRA)" <ji...@apache.org> on 2018/12/13 10:46:00 UTC
[jira] [Resolved] (OAK-7959) MongoDocumentStore causes scan of
entire nodes collection on startup
[ https://issues.apache.org/jira/browse/OAK-7959?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Marcel Reutegger resolved OAK-7959.
-----------------------------------
Resolution: Fixed
Fix Version/s: 1.10
Fixed in trunk: http://svn.apache.org/r1848837
> MongoDocumentStore causes scan of entire nodes collection on startup
> --------------------------------------------------------------------
>
> Key: OAK-7959
> URL: https://issues.apache.org/jira/browse/OAK-7959
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: mongomk
> Affects Versions: 1.9.10, 1.9.11, 1.9.12, 1.9.13
> Reporter: Marcel Reutegger
> Assignee: Marcel Reutegger
> Priority: Minor
> Fix For: 1.10
>
>
> This is a regression introduced with OAK-7645 when the MongoDB Java driver was updated to 3.8.
> With the switch to the new driver, the use of a deprecated method {{count()}} was replaced with {{countDocuments()}}. The method {{countDocument()}} behaves differently and performs an aggregation command over all documents in the collection. The MongoDB log would then show something like:
> {noformat}
> 2018-12-12T18:40:53.672+0100 I COMMAND [conn6063] command oak.nodes command: aggregate { aggregate: "nodes", readConcern: { level: "local" }, pipeline: [ { $match: {} }, { $group: { _id: null, n: { $sum: 1 } } } ], cursor: {}, $db: "oak", $readPreference: { mode: "primaryPreferred" } } planSummary: COLLSCAN keysExamined:0 docsExamined:4038809 cursorExhausted:1 numYields:31584 nreturned:1 reslen:127 locks:{ Global: { acquireCount: { r: 31586 } }, Database: { acquireCount: { r: 31586 } }, Collection: { acquireCount: { r: 31586 } } } protocol:op_msg 1642ms
> {noformat}
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