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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-35271] 4.0 rc0 upgrade from 3.6.5 logs &quot;unsupported WiredTiger file version&quot; error</title>
                <link>https://jira.mongodb.org/browse/SERVER-35271</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Created a MongoDB 3.4.15 standalone, then upgraded to 3.6.5, set FCV to &quot;3.6&quot;, then upgraded to 4.0.0 rc0. See a message in the log file:&lt;/p&gt;

&lt;p/&gt;
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&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;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;2018-05-29T12:15:43.124-0500 E STORAGE  [initandlisten] WiredTiger error (-31802) [1527614143:124208][2993:0x7fffddf7a3c0], connection: unsupported WiredTiger file version: this build requires a minimum version of 3, and the file is version 2: WT_ERROR: non-specific WiredTiger error&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;but, things seem to be working.&lt;/p&gt;

&lt;p&gt;If WT file version 2 is supported in 4.0, this message should be a warning at most. &lt;/p&gt;

&lt;p&gt;Also, how would one go about converting to version 3, if there is a reason to do so?&lt;/p&gt;</description>
                <environment></environment>
        <key id="550747">SERVER-35271</key>
            <summary>4.0 rc0 upgrade from 3.6.5 logs &quot;unsupported WiredTiger file version&quot; error</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="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="spencer.brown@mongodb.com">Spencer Brown</reporter>
                        <labels>
                    </labels>
                <created>Tue, 29 May 2018 17:30:55 +0000</created>
                <updated>Sun, 29 Oct 2023 22:31:19 +0000</updated>
                            <resolved>Fri, 15 Jun 2018 00:09:55 +0000</resolved>
                                    <version>4.0.0-rc0</version>
                                    <fixVersion>3.6.15</fixVersion>
                    <fixVersion>4.0.0-rc6</fixVersion>
                    <fixVersion>4.1.1</fixVersion>
                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="2398657" author="xgen-internal-githook" created="Thu, 29 Aug 2019 00:55:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;username&apos;: &apos;dgottlieb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35271&quot; title=&quot;4.0 rc0 upgrade from 3.6.5 logs &amp;quot;unsupported WiredTiger file version&amp;quot; error&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35271&quot;&gt;&lt;del&gt;SERVER-35271&lt;/del&gt;&lt;/a&gt;: Suppress WT compatibility error messages on startup.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 34b3da52dc10216453eed6dd0939f7cb4acc546a)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/143edc21c045a7c47c10ce4bcf552481789b7117&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/143edc21c045a7c47c10ce4bcf552481789b7117&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1921377" author="xgen-internal-githook" created="Fri, 15 Jun 2018 00:08:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dgottlieb&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35271&quot; title=&quot;4.0 rc0 upgrade from 3.6.5 logs &amp;quot;unsupported WiredTiger file version&amp;quot; error&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35271&quot;&gt;&lt;del&gt;SERVER-35271&lt;/del&gt;&lt;/a&gt;: Suppress WT compatibility error messages on startup.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 34b3da52dc10216453eed6dd0939f7cb4acc546a)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1115621110be9bd82079f425f766e2350ed5208d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1115621110be9bd82079f425f766e2350ed5208d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1921370" author="xgen-internal-githook" created="Fri, 15 Jun 2018 00:05:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dgottlieb&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35271&quot; title=&quot;4.0 rc0 upgrade from 3.6.5 logs &amp;quot;unsupported WiredTiger file version&amp;quot; error&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35271&quot;&gt;&lt;del&gt;SERVER-35271&lt;/del&gt;&lt;/a&gt;: Suppress WT compatibility error messages on startup.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/34b3da52dc10216453eed6dd0939f7cb4acc546a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/34b3da52dc10216453eed6dd0939f7cb4acc546a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1921104" author="xgen-internal-githook" created="Thu, 14 Jun 2018 19:59:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dgottlieb&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35271&quot; title=&quot;4.0 rc0 upgrade from 3.6.5 logs &amp;quot;unsupported WiredTiger file version&amp;quot; error&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35271&quot;&gt;&lt;del&gt;SERVER-35271&lt;/del&gt;&lt;/a&gt;: Suppress WT compatibility error messages on startup.&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 41954217c7c132bb7ad49dff49bdba20681ab36a.&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/efcf4332fd26af56452807d69d40ca78ccaf072d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/efcf4332fd26af56452807d69d40ca78ccaf072d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1921101" author="xgen-internal-githook" created="Thu, 14 Jun 2018 19:58:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dgottlieb&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35271&quot; title=&quot;4.0 rc0 upgrade from 3.6.5 logs &amp;quot;unsupported WiredTiger file version&amp;quot; error&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35271&quot;&gt;&lt;del&gt;SERVER-35271&lt;/del&gt;&lt;/a&gt;: Suppress WT compatibility error messages on startup.&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit ef999ac2018d29fd7425ea32df03eaab37d4709b.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d7db8c9d6f433a462abef8781fdb507681f6b694&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d7db8c9d6f433a462abef8781fdb507681f6b694&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1921031" author="xgen-internal-githook" created="Thu, 14 Jun 2018 19:11:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dgottlieb&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35271&quot; title=&quot;4.0 rc0 upgrade from 3.6.5 logs &amp;quot;unsupported WiredTiger file version&amp;quot; error&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35271&quot;&gt;&lt;del&gt;SERVER-35271&lt;/del&gt;&lt;/a&gt;: Suppress WT compatibility error messages on startup.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit ef999ac2018d29fd7425ea32df03eaab37d4709b)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/41954217c7c132bb7ad49dff49bdba20681ab36a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/41954217c7c132bb7ad49dff49bdba20681ab36a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1921028" author="xgen-internal-githook" created="Thu, 14 Jun 2018 19:08:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dgottlieb&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35271&quot; title=&quot;4.0 rc0 upgrade from 3.6.5 logs &amp;quot;unsupported WiredTiger file version&amp;quot; error&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35271&quot;&gt;&lt;del&gt;SERVER-35271&lt;/del&gt;&lt;/a&gt;: Suppress WT compatibility error messages on startup.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ef999ac2018d29fd7425ea32df03eaab37d4709b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ef999ac2018d29fd7425ea32df03eaab37d4709b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1919191" author="alexander.gorrod" created="Wed, 13 Jun 2018 03:21:48 +0000"  >&lt;p&gt;My vote here is for WiredTiger to use a common prefix for compatibility related error messages - essentially option 3 above. WiredTiger can promise not to change that prefix. I&apos;ve opened &lt;a href=&quot;https://jira.mongodb.org/browse/WT-4127&quot; title=&quot;Add common prefix for compatibility version errors&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-4127&quot;&gt;&lt;del&gt;WT-4127&lt;/del&gt;&lt;/a&gt; to track the WiredTiger side of this work.&lt;/p&gt;</comment>
                            <comment id="1918030" author="michael.cahill" created="Tue, 12 Jun 2018 06:29:28 +0000"  >&lt;p&gt;I still don&apos;t love it &amp;#8211; checking for specific strings is fragile &amp;#8211; but can live with it for now.  Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=daniel.gottlieb&quot; class=&quot;user-hover&quot; rel=&quot;daniel.gottlieb&quot;&gt;daniel.gottlieb&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sue.loverso&quot; class=&quot;user-hover&quot; rel=&quot;sue.loverso&quot;&gt;sue.loverso&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1915620" author="daniel.gottlieb@10gen.com" created="Fri, 8 Jun 2018 19:42:32 +0000"  >&lt;p&gt;If &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=michael.cahill&quot; class=&quot;user-hover&quot; rel=&quot;michael.cahill&quot;&gt;michael.cahill&lt;/a&gt; is ok with this, I&apos;ll move forward with assigning a code reviewer for the patch next week.&lt;/p&gt;</comment>
                            <comment id="1915608" author="sue.loverso" created="Fri, 8 Jun 2018 19:35:36 +0000"  >&lt;p&gt;I&apos;m personally a fan of this, probably not surprisingly. In the WT compatibility code functions just parsing the args and checking there are 10 different error messages for different things plus more in the logging code itself. That compares to you currently checking for two messages. So it would be difficult to filter inside to know what messages should or should not be quieted.&lt;/p&gt;</comment>
                            <comment id="1907725" author="michael.cahill" created="Fri, 1 Jun 2018 04:40:18 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sue.loverso&quot; class=&quot;user-hover&quot; rel=&quot;sue.loverso&quot;&gt;sue.loverso&lt;/a&gt;, the problem with having the event handler filter out messages is that when this &lt;tt&gt;wiredtiger_open&lt;/tt&gt; call succeeds, the event handler remains in place for the whole time the connection is open.  So the logic would be something like &quot;skip the first message if it matches &apos;unsupported WiredTiger.* version&apos;&quot;.&lt;/p&gt;

&lt;p&gt;If MongoDB passed &lt;tt&gt;compatibility=(require_min=&quot;3.1&quot;,quiet=true)&lt;/tt&gt; to suppress the error message, would that be terrible?&lt;/p&gt;</comment>
                            <comment id="1904675" author="sue.loverso" created="Wed, 30 May 2018 15:26:58 +0000"  >&lt;p&gt;What is happening is that MongoDB sets a &lt;tt&gt;compatibility=(require_min=&quot;3.1&quot;)&lt;/tt&gt; and the version of log files is earlier than that version. Looking at the server code, it attempts to open with decreasing release numbers in &lt;tt&gt;wiredtiger_kv_engine.cpp&lt;/tt&gt;. That is how the system appears to keep running after the error message.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=michael.cahill&quot; class=&quot;user-hover&quot; rel=&quot;michael.cahill&quot;&gt;michael.cahill&lt;/a&gt; I think that WiredTiger is doing the right thing in giving an error message in this case. The caller is explicitly asking for a required minimum that the current database does not meet. That is an error situation.&lt;/p&gt;

&lt;p&gt;I think suppressing the message should be done in MongoDB. I think sending in a special event handler to &lt;tt&gt;wiredtiger_open&lt;/tt&gt; that knows it is in this discovery mode and can ignore or otherwise choose to do something with this message would work. Or set a flag so that the existing event handler knows it is in this mode and can eat the message, or rethink the decreasing compatibility algorithm.&lt;/p&gt;</comment>
                            <comment id="1904116" author="michael.cahill" created="Wed, 30 May 2018 02:40:21 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sueloverso&quot; class=&quot;user-hover&quot; rel=&quot;sueloverso&quot;&gt;sueloverso&lt;/a&gt;, any thoughts on suppressing the message in this case?  It&apos;s technically possible for MongoDB to do it via message handling trickery but probably better done inside WT.&lt;/p&gt;</comment>
                            <comment id="1903680" author="spencer.brown" created="Tue, 29 May 2018 18:13:07 +0000"  >&lt;p&gt;Yes, if I set the FCV to &quot;4.0&quot; after upgrading to 4.0.0-rc0, upon restarting the mongod, the log message about &quot;unsupported WiredTiger file version&quot; is no longer there.&lt;/p&gt;</comment>
                            <comment id="1903642" author="milkie" created="Tue, 29 May 2018 17:52:03 +0000"  >&lt;p&gt;The behavior is as-designed; we should add more explanatory messages to the log in order to assuage any fears that something is going wrong.&lt;/p&gt;

&lt;p&gt;(WireTiger file version 1 is FCV 3.4, version 2 is FCV 3.6, and version 3 is FCV 4.0)&lt;/p&gt;</comment>
                            <comment id="1903610" author="spencer.brown" created="Tue, 29 May 2018 17:33:51 +0000"  >&lt;p&gt;Note: the same symptom occurs with a fresh instance of MongoDB 3.6.5. To reproduce this problem, it is not necessary to start with MongoDB 3.4.15 and upgrade to 3.6.5.&lt;/p&gt;</comment>
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3. Set FCV to &quot;3.6&quot;.&lt;br/&gt;
4. Upgrade to MongoDB 4.0.0 rc0 by starting new binaries.&lt;br/&gt;
5. Examine the mongod log file for the unsupported WT file version error.&lt;/p&gt;</customfieldvalue>

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