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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[SERVER-15334] Map/Reduce jobs stall when database is taking writes</title>
                <link>https://jira.mongodb.org/browse/SERVER-15334</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Because of a race condition in my code, I can delete a set of docs over which I am in the middle of running a map/reduce job (precise details below, I don&apos;t believe they are relevant). The map/reduce query is indexed.&lt;/p&gt;

&lt;p&gt;My expectation is that the map/reduce job would just &quot;ignore&quot; records that were deleted.&lt;/p&gt;

&lt;p&gt;Instead something odder seems to happen - the jobs last for way longer than they should and we see performance degradation&lt;/p&gt;

&lt;p&gt;For example, here&apos;s a db.currentOp:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        &quot;opid&quot; : &quot;replica_set1:406504931&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        &quot;active&quot; : true,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        &quot;secs_running&quot; : 560,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        &quot;op&quot; : &quot;query&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        &quot;ns&quot; : &quot;doc_metadata.metadata&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        &quot;query&quot; : {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                                &quot;$msg&quot; : &quot;query not recording (too large)&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        },&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        &quot;client_s&quot; : &quot;10.10.90.42:41453&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        &quot;desc&quot; : &quot;conn881377&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        &quot;threadId&quot; : &quot;0x6790e940&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        &quot;connectionId&quot; : 881377,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        &quot;locks&quot; : {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                                &quot;^doc_metadata&quot; : &quot;R&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        },&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        &quot;waitingForLock&quot; : true,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                        &quot;msg&quot; : &quot;m/r: (1/3) emit phase M/R: (1/3) Emit Progress: 2899/1 289900%&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                                &quot;done&quot; : 2899,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                                &quot;total&quot; : 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Check out the Emit Progress...&lt;/p&gt;

&lt;p&gt;There were a few of these, they all ran for 20 minutes or so (the number of docs being deleted was small - in the few thousand range), before eventually cleaning themselves up. &lt;/p&gt;

&lt;p&gt;Bonus worry: I have a similar case in which I run a map/reduce over the entire collection (several 10s of millions of documents), to which documents &lt;br/&gt;
are continually being added or removed - should I worry, or is this an edge case that happens when a high % of the query set is removed....&lt;/p&gt;


&lt;p&gt;(Details:&lt;br/&gt;
Thread 1: 1a) update a bunch of docs to have field:DELETE_ME&lt;br/&gt;
Thread 1:  2a) run a map/reduce job to count some of their attributes prior to deletion&lt;br/&gt;
Thread 2: 1b) update a bunch more docs to have field:DELETE_ME&lt;br/&gt;
Thread 2:  2b) run a map/reduce job to count some of their attributes prior to deletion&lt;br/&gt;
Thread 1: 3a) Remove all docs with field:DELETE ME&lt;br/&gt;
Thread 2: 3b) Remove all docs with field:DELETE ME&lt;br/&gt;
)&lt;/p&gt;


</description>
                <environment></environment>
        <key id="159211">SERVER-15334</key>
            <summary>Map/Reduce jobs stall when database is taking writes</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</assignee>
                                    <reporter username="apiggott@ikanow.com">Alex Piggott</reporter>
                        <labels>
                            <label>map_reduce</label>
                            <label>mapreduce</label>
                    </labels>
                <created>Fri, 19 Sep 2014 17:08:31 +0000</created>
                <updated>Wed, 1 Apr 2015 19:17:48 +0000</updated>
                            <resolved>Wed, 1 Apr 2015 19:13:51 +0000</resolved>
                                    <version>2.4.10</version>
                                                    <component>MapReduce</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="870583" author="apiggott@ikanow.com" created="Wed, 1 Apr 2015 19:17:48 +0000"  >&lt;p&gt;Thanks for the update! &lt;/p&gt;

&lt;p&gt;I haven&apos;t seen it, or at least noticed it, since I put some workarounds in to minimize the probability of the bulk delete/MR happening at the same time - so I mainly wanted to make sure you were aware it was happening and could look at fixing it in a later version - sounds like mission accomplished! &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="870572" author="ramon.fernandez" created="Wed, 1 Apr 2015 19:12:46 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=apiggott%40ikanow.com&quot; class=&quot;user-hover&quot; rel=&quot;apiggott@ikanow.com&quot;&gt;apiggott@ikanow.com&lt;/a&gt;, it seems we let this ticket fall through the cracks &amp;#8211; very sorry about that.&lt;/p&gt;

&lt;p&gt;After testing on my end I think the root of the issue is the following: the total emit work is calculated at the beginning of the job, but if more documents are inserted before the job completes the percentage will go above 100%. I&apos;m also able to see apparent performance problem: if documents are being inserted the write lock will prevent readers from making progress, so the mapReduce job will appear to be stuck.&lt;/p&gt;

&lt;p&gt;Note that newer versions of MongoDB have finer locking granularity, so if you need to be able to write to one collection while doing a mapReduce on another you may want to consider upgrading to MongoDB 3.0.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="764543" author="apiggott@ikanow.com" created="Fri, 14 Nov 2014 17:18:44 +0000"  >&lt;p&gt;Anyone planning to look at this? I&apos;ve personally worked around it, but it seems like there&apos;s a reasonably serious bug that doesn&apos;t require a particularly outlandish scenario to occur...&lt;/p&gt;</comment>
                            <comment id="723184" author="apiggott@ikanow.com" created="Fri, 19 Sep 2014 17:22:21 +0000"  >&lt;p&gt;Here are the map/reduce jobs being run&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/IKANOW/Infinit.e/blob/master/core/infinit.e.processing.generic.library/src/com/ikanow/infinit/e/processing/generic/aggregation/AggregationUtils_scriptlets.xml&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/IKANOW/Infinit.e/blob/master/core/infinit.e.processing.generic.library/src/com/ikanow/infinit/e/processing/generic/aggregation/AggregationUtils_scriptlets.xml&lt;/a&gt;&lt;/p&gt;


&lt;p&gt;via:&lt;br/&gt;
BasicDBObject mrQuery = new BasicDBObject(DocumentPojo.url_, uuid);&lt;br/&gt;
DbManager.getDocument().getMetadata().mapReduce(mapScript, reduceScript, outCollection, OutputType.REPLACE, mrQuery);&lt;/p&gt;

&lt;p&gt;Hmm so one other race condition potential is that I have multiple jobs running against the same output collection (and as mentioned above with the same query) - I couldn&apos;t find anything in the documentation that explicitly state that would be a problem&lt;/p&gt;</comment>
                            <comment id="723176" author="apiggott@ikanow.com" created="Fri, 19 Sep 2014 17:11:58 +0000"  >&lt;p&gt;Someone else reported something similar on stack overflow: &lt;a href=&quot;http://stackoverflow.com/questions/24312785/mongodb-mapreduce-causes-error-error-during-query&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://stackoverflow.com/questions/24312785/mongodb-mapreduce-causes-error-error-during-query&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="723172" author="apiggott@ikanow.com" created="Fri, 19 Sep 2014 17:09:16 +0000"  >&lt;p&gt;title should read &quot;degrade performance&quot; not &quot;kill performance&quot;, sorry got carried away!&lt;/p&gt;</comment>
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