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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-16699] degrading update performance</title>
                <link>https://jira.mongodb.org/browse/SERVER-16699</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I update large collection (~500gb snappy compressed data) on non-sharded environment. I split collection into chunks using splitVector, 32mb per chunk. Then I perform some analysis on each record and update each record (add one small field).  At the start everething is cool, performance comparable to TokuMX which I used earlier. But then performance degrades rapidly. You can find plots of some metrices attached. It is very strange that disk is not fully utilized, but cpu utilized at 100%.&lt;br/&gt;
My db hosted on ec2 r3.4xlarge machine.  Disks - 2 * 1TB ebs combined into raid0. &lt;/p&gt;</description>
                <environment></environment>
        <key id="176548">SERVER-16699</key>
            <summary>degrading update performance</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</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="bruce.lucas@mongodb.com">Bruce Lucas</assignee>
                                    <reporter username="dselivanov">Dmitriy Selivanov</reporter>
                        <labels>
                    </labels>
                <created>Wed, 31 Dec 2014 07:19:30 +0000</created>
                <updated>Mon, 23 Mar 2015 14:52:13 +0000</updated>
                            <resolved>Mon, 23 Mar 2015 14:52:13 +0000</resolved>
                                    <version>2.8.0-rc4</version>
                                    <fixVersion>3.0.0-rc6</fixVersion>
                                    <component>Storage</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="860854" author="ramon.fernandez" created="Mon, 23 Mar 2015 14:49:52 +0000"  >&lt;p&gt;No worries &amp;#8211; thanks for getting back to us &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dselivanov&quot; class=&quot;user-hover&quot; rel=&quot;dselivanov&quot;&gt;dselivanov&lt;/a&gt;. I&apos;m resolving this ticket then, please let us know if you run into any other issues.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="860573" author="dselivanov" created="Mon, 23 Mar 2015 06:48:54 +0000"  >&lt;p&gt;Hi. Starting from rc5 or rc6 I can&apos;t reproduce my issue. So I believe we can close this.&lt;br/&gt;
Sorry for delayed response.&lt;/p&gt;</comment>
                            <comment id="859591" author="ramon.fernandez" created="Fri, 20 Mar 2015 19:31:30 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dselivanov&quot; class=&quot;user-hover&quot; rel=&quot;dselivanov&quot;&gt;dselivanov&lt;/a&gt;, as you may have seen 3.0.0 was published earlier this month, followed by a 3.0.1 patch release earlier this week. Have you had a chance to re-test with either of these two versions?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="840712" author="ramon.fernandez" created="Mon, 2 Mar 2015 21:28:11 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dselivanov&quot; class=&quot;user-hover&quot; rel=&quot;dselivanov&quot;&gt;dselivanov&lt;/a&gt;, this is to let you know that we&apos;ve fixed a number of issues in the latest release candidates and we&apos;re working towards a 3.0.0 release, so you&apos;ll soon be able to test on the actual release.&lt;/p&gt;</comment>
                            <comment id="802608" author="dan@10gen.com" created="Mon, 12 Jan 2015 18:31:47 +0000"  >&lt;p&gt;Thanks Dmitry and welcome back.  We&apos;ll leave this issue open and look forward to an update.  Just as an FYI, we&apos;re planning on releasing the next release candidate late tomorrow.&lt;/p&gt;</comment>
                            <comment id="802162" author="dselivanov" created="Mon, 12 Jan 2015 09:02:50 +0000"  >&lt;p&gt;Hi Dan. Last time I executed my job in 12 threads (mongodb was on 16-core r3.4xlarge) and didn&apos;t noticed any problems with degrading performance and strange disk usage pattern. &lt;br/&gt;
Today is the first working after long christmas holidays in Russia, I will try to write reproducible example where this issue is represented.&lt;/p&gt;

&lt;p&gt;Logs (I think they are not very useful):&lt;br/&gt;
&lt;a href=&quot;https://s3-eu-west-1.amazonaws.com/scorr-misc/tmp/mdb/cs.log.gz&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://s3-eu-west-1.amazonaws.com/scorr-misc/tmp/mdb/cs.log.gz&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://s3-eu-west-1.amazonaws.com/scorr-misc/tmp/mdb/iostat.log.gz&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://s3-eu-west-1.amazonaws.com/scorr-misc/tmp/mdb/iostat.log.gz&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://s3-eu-west-1.amazonaws.com/scorr-misc/tmp/mdb/ss.log.gz&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://s3-eu-west-1.amazonaws.com/scorr-misc/tmp/mdb/ss.log.gz&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://s3-eu-west-1.amazonaws.com/scorr-misc/tmp/mdb/sysmon.log.gz&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://s3-eu-west-1.amazonaws.com/scorr-misc/tmp/mdb/sysmon.log.gz&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="801951" author="dan@10gen.com" created="Sun, 11 Jan 2015 19:44:45 +0000"  >&lt;p&gt;Hi Dmitry, any update on this issue?&lt;br/&gt;
Thanks, Dan&lt;/p&gt;</comment>
                            <comment id="796325" author="bruce.lucas@10gen.com" created="Fri, 2 Jan 2015 20:01:42 +0000"  >&lt;p&gt;Hi Dmitriy,&lt;/p&gt;

&lt;p&gt;Understood that setting up a repro might be complicated. Would you be willing to do another run, comparable to the one that you showed us the graphs for, while collecting some additional statistics? Please start mongod as you normally do, then start up the following monitoring on the same machine:&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;mongo --eval &quot;while(true) {print(JSON.stringify(db.serverStatus())); sleep(1000)}&quot; &amp;gt;ss.log &amp;amp;&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;mongo mydb --eval &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;    while(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;        s = db.normalized_profiles.stats();&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;        s.time = new Date();&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;        print(JSON.stringify(s));&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;        sleep(1000)&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; &amp;gt;cs.log &amp;amp;&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;iostat -t -x 1 &amp;gt;iostat.log &amp;amp;&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;   margin-bottom: 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;python sysmon.py 1 &amp;gt;sysmon.log &amp;amp;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;I&apos;ve attached sysmon.py to the ticket.&lt;/p&gt;

&lt;p&gt;Then please attach the resulting output files, together with mongod log file covering that timeframe. If you have any concern about sharing that data on this public ticket let me know and I will provide a private channel. Also if you can attach graphs comparable to the above that will be helpful; even better if possible would be a machine-readable file containing the stats that are graphed there for analysis by our tools.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Bruce&lt;/p&gt;</comment>
                            <comment id="795854" author="dselivanov" created="Wed, 31 Dec 2014 19:02:25 +0000"  >&lt;p&gt;1. systemLog:&lt;br/&gt;
   destination: file&lt;br/&gt;
   path: &quot;/storage/logs/mongodb.log&quot;&lt;br/&gt;
   logAppend: true&lt;br/&gt;
storage:&lt;br/&gt;
   dbPath: &quot;/storage/data&quot;&lt;br/&gt;
   engine: &quot;wiredTiger&quot;&lt;br/&gt;
   journal:&lt;br/&gt;
      enabled: false&lt;br/&gt;
   indexBuildRetry: false&lt;br/&gt;
net:&lt;br/&gt;
   port: 27017&lt;br/&gt;
2. I can share, program is R script. But I think it will be hard to understand underlying logic. It used *&lt;b&gt;rmongodb&lt;/b&gt;* (&lt;a href=&quot;https://github.com/mongosoup/rmongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongosoup/rmongodb&lt;/a&gt;) package (I&apos;m maintainer of this package), which is based on *&lt;b&gt;mongo-c-driver 0.8.0&lt;/b&gt;* (&lt;a href=&quot;https://github.com/mongodb/mongo-c-driver-legacy&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver-legacy&lt;/a&gt;).  Average size of document is 5124 bytes. Also I noticed one more strange thing. I have server mongod machine with 16 cores. If I run my script in 32 threads (from another client machine), updates are slow ~ 600-700 sec per 32mb chunk. db cpu fully utilized and disk almost all not utilizes. If I reduce threads to 16, one chunk update takes ~170 sec and disk utilized at ~30%.&lt;/p&gt;

&lt;p&gt;Here is stats of my collection:&lt;br/&gt;
/* 0 */&lt;br/&gt;
{&lt;br/&gt;
    &quot;ns&quot; : &quot;mydb.normalized_profiles&quot;,&lt;br/&gt;
    &quot;count&quot; : 214327259,&lt;br/&gt;
    &quot;size&quot; : 1098340528552,&lt;br/&gt;
    &quot;avgObjSize&quot; : 5124,&lt;br/&gt;
    &quot;storageSize&quot; : 573728669696,&lt;br/&gt;
    &quot;capped&quot; : false,&lt;br/&gt;
    &quot;wiredTiger&quot; : {&lt;br/&gt;
        &quot;metadata&quot; : {},&lt;br/&gt;
        &quot;creationString&quot; : &quot;allocation_size=4KB,app_metadata=(),block_allocation=best,block_compressor=snappy,cache_resident=0,checkpoint=(WiredTigerCheckpoint.20532=(addr=\&quot;01e408289e6681e424dc5c47e407afe8c6cf93e4435dea58e407afca0bcf0be410adb561808080e58594e49fc0e56b93718fc0\&quot;,order=20532,time=1420051642,size=462035202048,write_gen=573841289)),checkpoint_lsn=(48018,59367168),checksum=uncompressed,collator=,columns=,dictionary=0,format=btree,huffman_key=,huffman_value=,id=6,internal_item_max=0,internal_key_truncate=,internal_page_max=4KB,key_format=q,key_gap=10,leaf_item_max=0,leaf_page_max=32KB,memory_page_max=100m,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=0,prefix_compression_min=4,split_pct=75,value_format=u,version=(major=1,minor=1)&quot;,&lt;br/&gt;
        &quot;type&quot; : &quot;file&quot;,&lt;br/&gt;
        &quot;uri&quot; : &quot;statistics:table:collection-0-3607676398058767653&quot;,&lt;br/&gt;
        &quot;LSM&quot; : &lt;/p&gt;
{
            &quot;bloom filters in the LSM tree&quot; : 0,
            &quot;bloom filter false positives&quot; : 0,
            &quot;bloom filter hits&quot; : 0,
            &quot;bloom filter misses&quot; : 0,
            &quot;bloom filter pages evicted from cache&quot; : 0,
            &quot;bloom filter pages read into cache&quot; : 0,
            &quot;total size of bloom filters&quot; : 0,
            &quot;sleep for LSM checkpoint throttle&quot; : 0,
            &quot;chunks in the LSM tree&quot; : 0,
            &quot;highest merge generation in the LSM tree&quot; : 0,
            &quot;queries that could have benefited from a Bloom filter that did not exist&quot; : 0,
            &quot;sleep for LSM merge throttle&quot; : 0
        }
&lt;p&gt;,&lt;br/&gt;
        &quot;block-manager&quot; : &lt;/p&gt;
{
            &quot;file allocation unit size&quot; : 4096,
            &quot;blocks allocated&quot; : 69485067,
            &quot;checkpoint size&quot; : 462035202048,
            &quot;allocations requiring file extension&quot; : 0,
            &quot;blocks freed&quot; : 69346343,
            &quot;file magic number&quot; : 120897,
            &quot;file major version number&quot; : 1,
            &quot;minor version number&quot; : 0,
            &quot;file bytes available for reuse&quot; : 111722827776,
            &quot;file size in bytes&quot; : 573728669696
        }
&lt;p&gt;,&lt;br/&gt;
        &quot;btree&quot; : &lt;/p&gt;
{
            &quot;column-store variable-size deleted values&quot; : 0,
            &quot;column-store fixed-size leaf pages&quot; : 0,
            &quot;column-store internal pages&quot; : 0,
            &quot;column-store variable-size leaf pages&quot; : 0,
            &quot;pages rewritten by compaction&quot; : 0,
            &quot;number of key/value pairs&quot; : 0,
            &quot;fixed-record size&quot; : 0,
            &quot;maximum tree depth&quot; : 9766,
            &quot;maximum internal page key size&quot; : 307,
            &quot;maximum internal page size&quot; : 4096,
            &quot;maximum leaf page key size&quot; : 2457,
            &quot;maximum leaf page size&quot; : 32768,
            &quot;maximum leaf page value size&quot; : 12288,
            &quot;overflow pages&quot; : 0,
            &quot;row-store internal pages&quot; : 0,
            &quot;row-store leaf pages&quot; : 0
        }
&lt;p&gt;,&lt;br/&gt;
        &quot;cache&quot; : &lt;/p&gt;
{
            &quot;bytes read into cache&quot; : NumberLong(1540641708376),
            &quot;bytes written from cache&quot; : 965856098800,
            &quot;checkpoint blocked page eviction&quot; : 975677,
            &quot;unmodified pages evicted&quot; : 11021536,
            &quot;modified pages evicted&quot; : 31604075,
            &quot;data source pages selected for eviction unable to be evicted&quot; : 1114534,
            &quot;hazard pointer blocked page eviction&quot; : 16036,
            &quot;internal pages evicted&quot; : 35,
            &quot;in-memory page splits&quot; : 0,
            &quot;overflow values cached in memory&quot; : 393138,
            &quot;pages read into cache&quot; : 69265263,
            &quot;overflow pages read into cache&quot; : 25016375,
            &quot;pages written from cache&quot; : 69484368
        }
&lt;p&gt;,&lt;br/&gt;
        &quot;compression&quot; : &lt;/p&gt;
{
            &quot;raw compression call failed, no additional data available&quot; : 0,
            &quot;raw compression call failed, additional data available&quot; : 0,
            &quot;raw compression call succeeded&quot; : 0,
            &quot;compressed pages read&quot; : 68346447,
            &quot;compressed pages written&quot; : 43253057,
            &quot;page written failed to compress&quot; : 46,
            &quot;page written was too small to compress&quot; : 26230866
        }
&lt;p&gt;,&lt;br/&gt;
        &quot;cursor&quot; : &lt;/p&gt;
{
            &quot;create calls&quot; : 295,
            &quot;insert calls&quot; : 0,
            &quot;bulk-loaded cursor-insert calls&quot; : 0,
            &quot;cursor-insert key and value bytes inserted&quot; : 0,
            &quot;next calls&quot; : 0,
            &quot;prev calls&quot; : 1,
            &quot;remove calls&quot; : 0,
            &quot;cursor-remove key bytes removed&quot; : 0,
            &quot;reset calls&quot; : 142065177,
            &quot;search calls&quot; : 142031422,
            &quot;search near calls&quot; : 0,
            &quot;update calls&quot; : 35235635,
            &quot;cursor-update value bytes updated&quot; : 258994311365
        }
&lt;p&gt;,&lt;br/&gt;
        &quot;reconciliation&quot; : &lt;/p&gt;
{
            &quot;dictionary matches&quot; : 0,
            &quot;internal page multi-block writes&quot; : 2885,
            &quot;leaf page multi-block writes&quot; : 33605,
            &quot;maximum blocks required for a page&quot; : 3,
            &quot;internal-page overflow keys&quot; : 0,
            &quot;leaf-page overflow keys&quot; : 0,
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&lt;p&gt;,&lt;br/&gt;
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&lt;p&gt;,&lt;br/&gt;
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{
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&lt;p&gt;    },&lt;br/&gt;
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{ \&quot;_id\&quot; : 1 }
&lt;p&gt;, \&quot;name\&quot; : \&quot;&lt;em&gt;id&lt;/em&gt;\&quot;, \&quot;ns\&quot; : \&quot;mydb.normalized_profiles\&quot; }&quot;&lt;br/&gt;
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&lt;p&gt;, \&quot;name\&quot; : \&quot;&lt;em&gt;id&lt;/em&gt;\&quot;, \&quot;ns\&quot; : \&quot;mydb.normalized_profiles\&quot; }),block_allocation=best,block_compressor=,cache_resident=0,checkpoint=(WiredTigerCheckpoint.2=(addr=\&quot;01e30a80b981e453055a68e30a80ba81e45b113e14808080808080e4aa0f9fc0e4aa0f7fc0\&quot;,order=2,time=1419582444,size=2853150720,write_gen=233845)),checkpoint_lsn=(33753,92672),checksum=uncompressed,collator=mongo_index,columns=,dictionary=0,format=btree,huffman_key=,huffman_value=,id=77,internal_item_max=0,internal_key_max=0,internal_key_truncate=,internal_page_max=4KB,key_format=u,key_gap=10,leaf_item_max=0,leaf_key_max=0,leaf_page_max=16k,leaf_value_max=0,memory_page_max=5MB,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=,prefix_compression_min=4,split_pct=75,value_format=u,version=(major=1,minor=1)&quot;,&lt;br/&gt;
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&lt;p&gt;,&lt;br/&gt;
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&lt;p&gt;,&lt;br/&gt;
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&lt;p&gt;,&lt;br/&gt;
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&lt;p&gt;,&lt;br/&gt;
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&lt;p&gt;,&lt;br/&gt;
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&lt;p&gt;,&lt;br/&gt;
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&lt;p&gt;,&lt;br/&gt;
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&lt;p&gt;,&lt;br/&gt;
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&lt;p&gt;        },&lt;br/&gt;
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{ \&quot;source\&quot; : 1, \&quot;sourceId\&quot; : 1 }
&lt;p&gt;, \&quot;name\&quot; : \&quot;source_1_sourceId_1\&quot;, \&quot;ns\&quot; : \&quot;mydb.normalized_profiles\&quot;, \&quot;background\&quot; : true }&quot;&lt;br/&gt;
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{ \&quot;source\&quot; : 1, \&quot;sourceId\&quot; : 1 }
&lt;p&gt;, \&quot;name\&quot; : \&quot;source_1_sourceId_1\&quot;, \&quot;ns\&quot; : \&quot;mydb.normalized_profiles\&quot;, \&quot;background\&quot; : true }),block_allocation=best,block_compressor=,cache_resident=0,checkpoint=(WiredTigerCheckpoint.3=(addr=\&quot;01e3104c4281e451bf4d34e3104c4381e4cab0e7cce3104c4481e4de2d9e7d808080e50106c83fc0e50106c76fc0\&quot;,order=3,time=1419672432,size=4408709120,write_gen=362485)),checkpoint_lsn=(33800,547072),checksum=uncompressed,collator=mongo_index,columns=,dictionary=0,format=btree,huffman_key=,huffman_value=,id=78,internal_item_max=0,internal_key_max=0,internal_key_truncate=,internal_page_max=4KB,key_format=u,key_gap=10,leaf_item_max=0,leaf_key_max=0,leaf_page_max=16k,leaf_value_max=0,memory_page_max=5MB,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=,prefix_compression_min=4,split_pct=75,value_format=u,version=(major=1,minor=1)&quot;,&lt;br/&gt;
            &quot;type&quot; : &quot;file&quot;,&lt;br/&gt;
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&lt;p&gt;,&lt;br/&gt;
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                &quot;file size in bytes&quot; : 4408762368
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&lt;p&gt;,&lt;br/&gt;
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&lt;p&gt;,&lt;br/&gt;
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&lt;p&gt;,&lt;br/&gt;
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                &quot;page written was too small to compress&quot; : 0
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&lt;p&gt;,&lt;br/&gt;
            &quot;cursor&quot; : &lt;/p&gt;
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&lt;p&gt;,&lt;br/&gt;
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&lt;p&gt;,&lt;br/&gt;
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&lt;p&gt;,&lt;br/&gt;
            &quot;transaction&quot; : &lt;/p&gt;
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&lt;p&gt;        },&lt;br/&gt;
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{ \&quot;email.data.value\&quot; : 1 }
&lt;p&gt;, \&quot;name\&quot; : \&quot;email.data.value_1\&quot;, \&quot;ns\&quot; : \&quot;mydb.normalized_profiles\&quot; }&quot;&lt;br/&gt;
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            &quot;creationString&quot; : &quot;allocation_size=4KB,app_metadata=(formatVersion=1,infoObj={ \&quot;v\&quot; : 1, \&quot;key\&quot; : &lt;/p&gt;
{ \&quot;email.data.value\&quot; : 1 }
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            &quot;type&quot; : &quot;file&quot;,&lt;br/&gt;
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                &quot;bloom filters in the LSM tree&quot; : 0,
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                &quot;queries that could have benefited from a Bloom filter that did not exist&quot; : 0,
                &quot;sleep for LSM merge throttle&quot; : 0
            }
&lt;p&gt;,&lt;br/&gt;
            &quot;block-manager&quot; : &lt;/p&gt;
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                &quot;file size in bytes&quot; : 3923267584
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&lt;p&gt;,&lt;br/&gt;
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&lt;p&gt;,&lt;br/&gt;
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&lt;p&gt;,&lt;br/&gt;
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                &quot;page written failed to compress&quot; : 0,
                &quot;page written was too small to compress&quot; : 0
            }
&lt;p&gt;,&lt;br/&gt;
            &quot;cursor&quot; : &lt;/p&gt;
{
                &quot;create calls&quot; : 0,
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                &quot;cursor-insert key and value bytes inserted&quot; : 0,
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                &quot;cursor-update value bytes updated&quot; : 0
            }
&lt;p&gt;,&lt;br/&gt;
            &quot;reconciliation&quot; : &lt;/p&gt;
{
                &quot;dictionary matches&quot; : 0,
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                &quot;leaf page key bytes discarded using prefix compression&quot; : 0,
                &quot;internal page key bytes discarded using suffix compression&quot; : 0
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&lt;p&gt;,&lt;br/&gt;
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&lt;p&gt;        }&lt;br/&gt;
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}&lt;/p&gt;</comment>
                            <comment id="795761" author="dan@10gen.com" created="Wed, 31 Dec 2014 15:31:24 +0000"  >&lt;p&gt;Thanks for the report Dmitriy.  Can you provide a few more details on your case?&lt;/p&gt;

&lt;p&gt;1. mongod startup configuration&lt;br/&gt;
2. are you able to share your test program?  if not, can you tell me the driver and version you&apos;re using as well as the average document size?&lt;/p&gt;

&lt;p&gt;Thanks&lt;br/&gt;
Dan&lt;/p&gt;</comment>
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