From oak-issues-return-73601-archive-asf-public=cust-asf.ponee.io@jackrabbit.apache.org Mon Jul 15 09:38:06 2019 Return-Path: X-Original-To: archive-asf-public@cust-asf.ponee.io Delivered-To: archive-asf-public@cust-asf.ponee.io Received: from mail.apache.org (hermes.apache.org [207.244.88.153]) by mx-eu-01.ponee.io (Postfix) with SMTP id B3255180684 for ; Mon, 15 Jul 2019 11:38:05 +0200 (CEST) Received: (qmail 45898 invoked by uid 500); 15 Jul 2019 09:38:02 -0000 Mailing-List: contact oak-issues-help@jackrabbit.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: oak-dev@jackrabbit.apache.org Delivered-To: mailing list oak-issues@jackrabbit.apache.org Received: (qmail 45772 invoked by uid 99); 15 Jul 2019 09:38:02 -0000 Received: from mailrelay1-us-west.apache.org (HELO mailrelay1-us-west.apache.org) (209.188.14.139) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 15 Jul 2019 09:38:02 +0000 Received: from jira-lw-us.apache.org (unknown [207.244.88.139]) by mailrelay1-us-west.apache.org (ASF Mail Server at mailrelay1-us-west.apache.org) with ESMTP id 37D25E2EF6 for ; Mon, 15 Jul 2019 09:38:01 +0000 (UTC) Received: from jira-lw-us.apache.org (localhost [127.0.0.1]) by jira-lw-us.apache.org (ASF Mail Server at jira-lw-us.apache.org) with ESMTP id 9873726594 for ; Mon, 15 Jul 2019 09:38:00 +0000 (UTC) Date: Mon, 15 Jul 2019 09:38:00 +0000 (UTC) From: "Davide Giannella (JIRA)" To: oak-issues@jackrabbit.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Closed] (OAK-8351) Long running RGC remove and getmore operations MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ https://issues.apache.org/jira/browse/OAK-8351?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Davide Giannella closed OAK-8351. --------------------------------- bulk close 1.10.3 > Long running RGC remove and getmore operations > ---------------------------------------------- > > Key: OAK-8351 > URL: https://issues.apache.org/jira/browse/OAK-8351 > Project: Jackrabbit Oak > Issue Type: Bug > Components: mongomk > Affects Versions: 1.12.0 > Reporter: Stefan Egli > Assignee: Stefan Egli > Priority: Major > Fix For: 1.10.3, 1.16.0, 1.8.15 > > Attachments: OAK-8351-1.10.patch, OAK-8351-1.8.patch, OAK-8351-merged-1.8.patch, OAK-8351.patch > > > On a mongodb setup a long running revision garbage collection operation has been witnessed. The query was running for hours. Doing a {{planCacheSetFilter}}, which hinted mongodb to use a specific index, together with killing the running command resolved the situation. > The problem was that mongodb generated a query plan which scored high (2.0003) but included an index scan through the {{\_id_}} index (and the collection contained millions of documents). It also generated other, better, plans, but they all "only" had the same high score, so it seemed legitimate that mongodb would choose this one. > The reason why this, problematic, query plan resulted in a high score seems to be that it does indeed find 101 documents after entering the first "or" - but during query execution it would also enter the other "or" parts where it has chosen to do a {{\_id_}} index scan. > The query involved was: > {noformat} > { > "_sdType" : { > "$in" : [ > 50, > 60, > 70 > ] > }, > "$or" : [ > { > "_sdType" : 50 > }, > { > "_sdType" : 60 > }, > { > "_sdType" : 70, > "$or" : [ > { > "_id" : /.*-1\/0/ > }, > { > "_id" : /[^-]*/, > "_path" : /.*-1\/0/ > } > ], > "_sdMaxRevTime" : { > "$lt" : NumberLong(1551843365) > } > }, > { > "_sdType" : 70, > "$or" : [ > { > "_id" : /.*-2\/0/ > }, > { > "_id" : /[^-]*/, > "_path" : /.*-2\/0/ > } > ], > "_sdMaxRevTime" : { > "$lt" : NumberLong(1550757370) > } > } > ], > "_sdMaxRevTime" : { > "$lt" : NumberLong(1551756965) > } > } > {noformat} > The problematic plan was: > {noformat} > { > "details" : { > "solution" : "(index-tagged expression tree: tree=Node\n---Node\n------Node\n---------Node\n------------Node\n---------------Leaf _id_, pos: 0, can combine? 1\n---------------Leaf \n------------Leaf _id_, pos: 0, can combine? 1\n---------Leaf \n---------Leaf \n------Node\n---------Node\n------------Node\n---------------Leaf _id_, pos: 0, can combine? 1\n---------------Leaf \n------------Leaf _id_, pos: 0, can combine? 1\n---------Leaf \n---------Leaf \n------Leaf _sdType_1__sdMaxRevTime_1, pos: 0, can combine? 1\n------Leaf _sdType_1__sdMaxRevTime_1, pos: 0, can combine? 1\n---Leaf Move to 2: _sdType_1__sdMaxRevTime_1, pos: 1, can combine? 1. Move to 3: _sdType_1__sdMaxRevTime_1, pos: 1, can combine? 1. \n---Leaf Move to 2: _sdType_1__sdMaxRevTime_1, pos: 0, can combine? 1. Move to 3: _sdType_1__sdMaxRevTime_1, pos: 0, can combine? 1. \n)" > }, > "reason" : { > "score" : 2.0003, > "stats" : { > "stage" : "FETCH", > "filter" : { > "$and" : [ > { > "_sdMaxRevTime" : { > "$lt" : NumberLong(1551410180) > } > }, > { > "_sdType" : { > "$in" : [ > 50, > 60, > 70 > ] > } > } > ] > }, > "nReturned" : 101, > "executionTimeMillisEstimate" : 0, > "works" : 101, > "advanced" : 101, > "needTime" : 0, > "needYield" : 0, > "saveState" : 3, > "restoreState" : 3, > "isEOF" : 0, > "invalidates" : 0, > "docsExamined" : 101, > "alreadyHasObj" : 0, > "inputStage" : { > "stage" : "OR", > "nReturned" : 101, > "executionTimeMillisEstimate" : 0, > "works" : 101, > "advanced" : 101, > "needTime" : 0, > "needYield" : 0, > "saveState" : 3, > "restoreState" : 3, > "isEOF" : 0, > "invalidates" : 0, > "dupsTested" : 101, > "dupsDropped" : 0, > "recordIdsForgotten" : 0, > "inputStages" : [ > { > "stage" : "IXSCAN", > "nReturned" : 101, > "executionTimeMillisEstimate" : 0, > "works" : 101, > "advanced" : 101, > "needTime" : 0, > "needYield" : 0, > "saveState" : 3, > "restoreState" : 3, > "isEOF" : 0, > "invalidates" : 0, > "keyPattern" : { > "_sdType" : 1, > "_sdMaxRevTime" : 1 > }, > "indexName" : "_sdType_1__sdMaxRevTime_1", > "isMultiKey" : false, > "multiKeyPaths" : { > "_sdType" : [ ], > "_sdMaxRevTime" : [ ] > }, > "isUnique" : false, > "isSparse" : true, > "isPartial" : false, > "indexVersion" : 2, > "direction" : "forward", > "indexBounds" : { > "_sdType" : [ > "[50, 50]" > ], > "_sdMaxRevTime" : [ > "[-inf.0, 1551410180)" > ] > }, > "keysExamined" : 101, > "seeks" : 1, > "dupsTested" : 0, > "dupsDropped" : 0, > "seenInvalidated" : 0 > }, > { > "stage" : "IXSCAN", > "nReturned" : 0, > "executionTimeMillisEstimate" : 0, > "works" : 0, > "advanced" : 0, > "needTime" : 0, > "needYield" : 0, > "saveState" : 3, > "restoreState" : 3, > "isEOF" : 0, > "invalidates" : 0, > "keyPattern" : { > "_sdType" : 1, > "_sdMaxRevTime" : 1 > }, > "indexName" : "_sdType_1__sdMaxRevTime_1", > "isMultiKey" : false, > "multiKeyPaths" : { > "_sdType" : [ ], > "_sdMaxRevTime" : [ ] > }, > "isUnique" : false, > "isSparse" : true, > "isPartial" : false, > "indexVersion" : 2, > "direction" : "forward", > "indexBounds" : { > "_sdType" : [ > "[60, 60]" > ], > "_sdMaxRevTime" : [ > "[-inf.0, 1551410180)" > ] > }, > "keysExamined" : 0, > "seeks" : 0, > "dupsTested" : 0, > "dupsDropped" : 0, > "seenInvalidated" : 0 > }, > { > "stage" : "FETCH", > "filter" : { > "$and" : [ > { > "_sdType" : { > "$eq" : 70 > } > }, > { > "_sdMaxRevTime" : { > "$lt" : NumberLong(1551496575) > } > } > ] > }, > "nReturned" : 0, > "executionTimeMillisEstimate" : 0, > "works" : 0, > "advanced" : 0, > "needTime" : 0, > "needYield" : 0, > "saveState" : 3, > "restoreState" : 3, > "isEOF" : 0, > "invalidates" : 0, > "docsExamined" : 0, > "alreadyHasObj" : 0, > "inputStage" : { > "stage" : "OR", > "nReturned" : 0, > "executionTimeMillisEstimate" : 0, > "works" : 0, > "advanced" : 0, > "needTime" : 0, > "needYield" : 0, > "saveState" : 3, > "restoreState" : 3, > "isEOF" : 0, > "invalidates" : 0, > "dupsTested" : 0, > "dupsDropped" : 0, > "recordIdsForgotten" : 0, > "inputStages" : [ > { > "stage" : "FETCH", > "filter" : { > "_path" : { > "$regex" : ".*-1/0" > } > }, > "nReturned" : 0, > "executionTimeMillisEstimate" : 0, > "works" : 0, > "advanced" : 0, > "needTime" : 0, > "needYield" : 0, > "saveState" : 3, > "restoreState" : 3, > "isEOF" : 0, > "invalidates" : 0, > "docsExamined" : 0, > "alreadyHasObj" : 0, > "inputStage" : { > "stage" : "IXSCAN", > "filter" : { > "_id" : { > "$regex" : "[^-]*" > } > }, > "nReturned" : 0, > "executionTimeMillisEstimate" : 0, > "works" : 0, > "advanced" : 0, > "needTime" : 0, > "needYield" : 0, > "saveState" : 3, > "restoreState" : 3, > "isEOF" : 0, > "invalidates" : 0, > "keyPattern" : { > "_id" : 1 > }, > "indexName" : "_id_", > "isMultiKey" : false, > "multiKeyPaths" : { > "_id" : [ ] > }, > "isUnique" : true, > "isSparse" : false, > "isPartial" : false, > "indexVersion" : 2, > "direction" : "forward", > "indexBounds" : { > "_id" : [ > "[\"\", {})", > "[/[^-]*/, /[^-]*/]" > ] > }, > "keysExamined" : 0, > "seeks" : 0, > "dupsTested" : 0, > "dupsDropped" : 0, > "seenInvalidated" : 0 > } > }, > { > "stage" : "IXSCAN", > "filter" : { > "$or" : [ > { > "_id" : { > "$regex" : ".*-1/0" > } > } > ] > }, > "nReturned" : 0, > "executionTimeMillisEstimate" : 0, > "works" : 0, > "advanced" : 0, > "needTime" : 0, > "needYield" : 0, > "saveState" : 3, > "restoreState" : 3, > "isEOF" : 0, > "invalidates" : 0, > "keyPattern" : { > "_id" : 1 > }, > "indexName" : "_id_", > "isMultiKey" : false, > "multiKeyPaths" : { > "_id" : [ ] > }, > "isUnique" : true, > "isSparse" : false, > "isPartial" : false, > "indexVersion" : 2, > "direction" : "forward", > "indexBounds" : { > "_id" : [ > "[\"\", {})", > "[/.*-1/0/, /.*-1/0/]" > ] > }, > "keysExamined" : 0, > "seeks" : 0, > "dupsTested" : 0, > "dupsDropped" : 0, > "seenInvalidated" : 0 > } > ] > } > }, > { > "stage" : "FETCH", > "filter" : { > "$and" : [ > { > "_sdType" : { > "$eq" : 70 > } > }, > { > "_sdMaxRevTime" : { > "$lt" : NumberLong(1550757370) > } > } > ] > }, > "nReturned" : 0, > "executionTimeMillisEstimate" : 0, > "works" : 0, > "advanced" : 0, > "needTime" : 0, > "needYield" : 0, > "saveState" : 3, > "restoreState" : 3, > "isEOF" : 0, > "invalidates" : 0, > "docsExamined" : 0, > "alreadyHasObj" : 0, > "inputStage" : { > "stage" : "OR", > "nReturned" : 0, > "executionTimeMillisEstimate" : 0, > "works" : 0, > "advanced" : 0, > "needTime" : 0, > "needYield" : 0, > "saveState" : 3, > "restoreState" : 3, > "isEOF" : 0, > "invalidates" : 0, > "dupsTested" : 0, > "dupsDropped" : 0, > "recordIdsForgotten" : 0, > "inputStages" : [ > { > "stage" : "FETCH", > "filter" : { > "_path" : { > "$regex" : ".*-2/0" > } > }, > "nReturned" : 0, > "executionTimeMillisEstimate" : 0, > "works" : 0, > "advanced" : 0, > "needTime" : 0, > "needYield" : 0, > "saveState" : 3, > "restoreState" : 3, > "isEOF" : 0, > "invalidates" : 0, > "docsExamined" : 0, > "alreadyHasObj" : 0, > "inputStage" : { > "stage" : "IXSCAN", > "filter" : { > "_id" : { > "$regex" : "[^-]*" > } > }, > "nReturned" : 0, > "executionTimeMillisEstimate" : 0, > "works" : 0, > "advanced" : 0, > "needTime" : 0, > "needYield" : 0, > "saveState" : 3, > "restoreState" : 3, > "isEOF" : 0, > "invalidates" : 0, > "keyPattern" : { > "_id" : 1 > }, > "indexName" : "_id_", > "isMultiKey" : false, > "multiKeyPaths" : { > "_id" : [ ] > }, > "isUnique" : true, > "isSparse" : false, > "isPartial" : false, > "indexVersion" : 2, > "direction" : "forward", > "indexBounds" : { > "_id" : [ > "[\"\", {})", > "[/[^-]*/, /[^-]*/]" > ] > }, > "keysExamined" : 0, > "seeks" : 0, > "dupsTested" : 0, > "dupsDropped" : 0, > "seenInvalidated" : 0 > } > }, > { > "stage" : "IXSCAN", > "filter" : { > "$or" : [ > { > "_id" : { > "$regex" : ".*-2/0" > } > } > ] > }, > "nReturned" : 0, > "executionTimeMillisEstimate" : 0, > "works" : 0, > "advanced" : 0, > "needTime" : 0, > "needYield" : 0, > "saveState" : 3, > "restoreState" : 3, > "isEOF" : 0, > "invalidates" : 0, > "keyPattern" : { > "_id" : 1 > }, > "indexName" : "_id_", > "isMultiKey" : false, > "multiKeyPaths" : { > "_id" : [ ] > }, > "isUnique" : true, > "isSparse" : false, > "isPartial" : false, > "indexVersion" : 2, > "direction" : "forward", > "indexBounds" : { > "_id" : [ > "[\"\", {})", > "[/.*-2/0/, /.*-2/0/]" > ] > }, > "keysExamined" : 0, > "seeks" : 0, > "dupsTested" : 0, > "dupsDropped" : 0, > "seenInvalidated" : 0 > } > ] > } > } > ] > } > } > }, > "feedback" : { > "nfeedback" : 18, > "scores" : [ > { > "score" : 2.0003 > }, > { > "score" : 2.0003 > }, > { > "score" : 2.0003 > }, > { > "score" : 2.0003 > }, > { > "score" : 2.0003 > }, > { > "score" : 2.0003 > }, > { > "score" : 2.0003 > }, > { > "score" : 2.0003 > }, > { > "score" : 2.0003 > }, > { > "score" : 2.0003 > }, > { > "score" : 2.0003 > }, > { > "score" : 2.0003 > }, > { > "score" : 2.0003 > }, > { > "score" : 2.0003 > }, > { > "score" : 2.0003 > }, > { > "score" : 2.0003 > }, > { > "score" : 2.0003 > }, > { > "score" : 2.0003 > } > ] > }, > "filterSet" : false > } > {noformat} > Note that this was primarily caused by [SERVER-20616|https://jira.mongodb.org/browse/SERVER-20616] and that [SERVER-42090|https://jira.mongodb.org/browse/SERVER-42090] and [SERVER-24396|https://jira.mongodb.org/browse/SERVER-24396] would also have been helpful preventing this. -- This message was sent by Atlassian JIRA (v7.6.14#76016)