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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>
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<item>
            <title>[SERVER-40337] Remove oldestOpenUnpreparedReadTimestamp</title>
                <link>https://jira.mongodb.org/browse/SERVER-40337</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;serverStatus&lt;/tt&gt; metric &lt;tt&gt;oldestOpenUnpreparedReadTimestamp&lt;/tt&gt; is named to represent the oldest read timestamp of any unprepared transaction. However, as described in &lt;a href=&quot;https://jira.mongodb.org/browse/WT-4154&quot; title=&quot;Surface the oldest read timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-4154&quot;&gt;&lt;del&gt;WT-4154&lt;/del&gt;&lt;/a&gt;, this value is the &lt;tt&gt;oldest_active_reader&lt;/tt&gt;, which is the minimum read timestamp of all active readers. Timestamped reads can occur without multi-document transactions, e.g. all secondary reads, so this value exists even when the server has no open, unprepared transactions. We will remove this &lt;tt&gt;serverStatus&lt;/tt&gt; metrics, and the oldest active read timestamp will be added to WT statistics in&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/WT-4704&quot; title=&quot;Add statistic tracking oldest active read timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-4704&quot;&gt;&lt;del&gt;WT-4704&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="723169">SERVER-40337</key>
            <summary>Remove oldestOpenUnpreparedReadTimestamp</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="13201">Fixed</resolution>
                                        <assignee username="lingzhi.deng@mongodb.com">Lingzhi Deng</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                            <label>prepare_diagnostics</label>
                    </labels>
                <created>Tue, 26 Mar 2019 13:55:34 +0000</created>
                <updated>Sun, 29 Oct 2023 22:22:37 +0000</updated>
                            <resolved>Tue, 9 Apr 2019 16:53:23 +0000</resolved>
                                                    <fixVersion>4.1.10</fixVersion>
                                    <component>Replication</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2206836" author="lingzhi.deng" created="Tue, 9 Apr 2019 16:53:23 +0000"  >&lt;p&gt;Documentation changes: remove &lt;a href=&quot;https://docs.mongodb.com/master/reference/command/serverStatus/#serverstatus.transactions.oldestOpenUnpreparedReadTimestamp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;transactions.oldestOpenUnpreparedReadTimestamp&lt;/a&gt; from &lt;tt&gt;serverStatus&lt;/tt&gt;.&lt;/p&gt;</comment>
                            <comment id="2206827" author="xgen-internal-githook" created="Tue, 9 Apr 2019 16:46:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;, &apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;username&apos;: &apos;ldennis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40337&quot; title=&quot;Remove oldestOpenUnpreparedReadTimestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40337&quot;&gt;&lt;del&gt;SERVER-40337&lt;/del&gt;&lt;/a&gt;: Remove oldestOpenUnpreparedReadTimestamp from serverStatus.transactions&lt;/p&gt;

&lt;p&gt;This reverts most of the work done in 3bb72042c29ceac96ec628ee643cbc4db8e982ab&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/decf670a6d7ec7a31c3820032188aab3fdc0fbd1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/decf670a6d7ec7a31c3820032188aab3fdc0fbd1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2203193" author="tess.avitabile" created="Fri, 5 Apr 2019 13:34:20 +0000"  >&lt;blockquote&gt;
&lt;p&gt;Wouldn&apos;t the oldest reader identify history being pinned by any query, not by a multi-document transaction read per se? Or will we use the oldest reader value to determine that it&apos;s not the cause of pinned history because it&apos;s later than the current oldest timestamp value?&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Yes, the oldest active read timestamp will identify history being pinned by any query. However, for timestamped reads other than multi-document transactions (e.g. majority reads and secondary reads), I would expect them to seldom be the cause of pinned history because they yield their snapshot. The oldest active read timestamp might be helpful in identifying whether transactions that run close to the 1 minute limit are problematic. Or, as you said, we could use the oldest active read timestamp to determine that readers are not the cause of pinned history.&lt;/p&gt;</comment>
                            <comment id="2203168" author="milkie" created="Fri, 5 Apr 2019 13:21:49 +0000"  >&lt;p&gt;Wouldn&apos;t the oldest reader identify history being pinned by any query, not by a multi-document transaction read per se?  Or will we use the oldest reader value to determine that it&apos;s not the cause of pinned history because it&apos;s later than the current oldest timestamp value?&lt;/p&gt;</comment>
                            <comment id="2202676" author="tess.avitabile" created="Thu, 4 Apr 2019 21:27:11 +0000"  >&lt;p&gt;I think reporting the oldest reader is independently useful, since this can be used to diagnose history being pinned by transactions. That was our original intention with reporting oldestOpenUnpreparedReadTimestamp.&lt;/p&gt;</comment>
                            <comment id="2202596" author="alexander.gorrod" created="Thu, 4 Apr 2019 20:50:08 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt; We already report &lt;tt&gt;transaction range of timestamps currently pinned&lt;/tt&gt; - which reports the lower of either &lt;tt&gt;oldest_timestamp&lt;/tt&gt; and the oldest reader. If reporting the oldest reader as a statistic is independently useful I&apos;m happy to add it.&lt;/p&gt;</comment>
                            <comment id="2202222" author="milkie" created="Thu, 4 Apr 2019 17:34:31 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alexander.gorrod&quot; class=&quot;user-hover&quot; rel=&quot;alexander.gorrod&quot;&gt;alexander.gorrod&lt;/a&gt;, I was wondering if it would be possible to add an oldest_active_reader as a true WiredTiger statistic that would be returned alongside all the other stats returned by &lt;tt&gt;statistics=(fast)&lt;/tt&gt;, or if the calculation of this particular stat would not qualify as &quot;fast&quot;.&lt;br/&gt;
If we could have WiredTiger output this stat itself, then we wouldn&apos;t need to separately query it and output it in serverStatus in the MongoDB code.&lt;/p&gt;</comment>
                            <comment id="2201666" author="tess.avitabile" created="Thu, 4 Apr 2019 11:50:25 +0000"  >&lt;p&gt;Good point, I see that this is part of the general &lt;tt&gt;StorageInterface&lt;/tt&gt;. Do you think it should go in the &lt;tt&gt;storageEngine&lt;/tt&gt; section? My only reservation about putting it there was that &lt;tt&gt;storageEngine&lt;/tt&gt; seems to mostly contain unchanging properties of the storage engine. However, maybe that&apos;s the best place for it.&lt;/p&gt;</comment>
                            <comment id="2201388" author="milkie" created="Wed, 3 Apr 2019 23:52:38 +0000"  >&lt;p&gt;I understand the naming change, but I don&apos;t understand why we would move this into the wiredTiger section.  Is there an assumption that other storage engines that support timestamps won&apos;t have such a value?&lt;/p&gt;</comment>
                            <comment id="2201142" author="lingzhi.deng" created="Wed, 3 Apr 2019 20:26:11 +0000"  >&lt;p&gt;We want to move the oldest active reader timestamp (i.e. query_timestamp(&#8216;get=oldest_reader&#8217;)) to the wiredTiger serverStatus. But I am not quite sure which section under wiredTiger should I put that into. I was thinking wiredTiger.transaction but it doesnt seem quite right. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=geert.bosch&quot; class=&quot;user-hover&quot; rel=&quot;geert.bosch&quot;&gt;geert.bosch&lt;/a&gt;, what&apos;s your take on exposing the timestamp to wiredTiger serverStatus? Thanks.&lt;/p&gt;</comment>
                            <comment id="2193133" author="tess.avitabile" created="Wed, 27 Mar 2019 14:19:12 +0000"  >&lt;p&gt;Thanks, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alexander.gorrod&quot; class=&quot;user-hover&quot; rel=&quot;alexander.gorrod&quot;&gt;alexander.gorrod&lt;/a&gt;, I&apos;m glad there is diagnosability for this.&lt;/p&gt;</comment>
                            <comment id="2192791" author="alexander.gorrod" created="Wed, 27 Mar 2019 04:39:00 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt; if there is no read timestamp, cache pressure is caused by keeping transaction IDs active. Those are captured in WiredTiger statistics:&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;
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					&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;transaction range of IDs currently pinned by a checkpoint&lt;/span&gt;&lt;/pre&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;transaction range of IDs currently pinned&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;transaction range of timestamps currently pinned&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;transaction range of timestamps pinned by a checkpoint&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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					&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;transaction range of timestamps pinned by the oldest timestamp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;There is no way to correlate transaction IDs to elapsed time, but a large or growing range in &lt;tt&gt;transaction range of IDs currently pinned&lt;/tt&gt; should give you the relevant information.&lt;/p&gt;</comment>
                            <comment id="2191732" author="tess.avitabile" created="Tue, 26 Mar 2019 14:04:19 +0000"  >&lt;p&gt;Another concern is that after&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38906&quot; title=&quot;Multi-document transactions should not perform timestamped read ahead of all-committed&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38906&quot;&gt;&lt;del&gt;SERVER-38906&lt;/del&gt;&lt;/a&gt;, only transactions with &lt;tt&gt;readConcern&lt;/tt&gt;&#160;level &lt;tt&gt;snapshot&lt;/tt&gt; perform timestamped reads. This means that this &lt;tt&gt;serverStatus&lt;/tt&gt; metric will not capture history pinned by all multi-document transactions. Is there a way to capture this potential source of cache pressure? &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alexander.gorrod&quot; class=&quot;user-hover&quot; rel=&quot;alexander.gorrod&quot;&gt;alexander.gorrod&lt;/a&gt;&lt;/p&gt;</comment>
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                <issuelinks>
                            <issuelinktype id="10320">
                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="737167">DOCS-12628</issuekey>
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            <issuekey id="730305">WT-4704</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="555121">SERVER-35449</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="562219">SERVER-35713</issuekey>
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            <issuelink>
            <issuekey id="566634">WT-4154</issuekey>
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