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    <link>https://jira.mongodb.org</link>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-36815] Remove the references of hash field of oplog entry</title>
                <link>https://jira.mongodb.org/browse/SERVER-36815</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In PV1, hash is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0ed9472dc8c2f85e957052f01336b1247c7a6e75/src/mongo/db/repl/oplog.cpp#L173&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;a random number&lt;/a&gt; and unnecessary, so we can remove its all references, including &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3ab73b4546be136606e52549da4e93f469d413b3/src/mongo/db/repl/oplog_fetcher.cpp#L129&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;OpTimeWithHash&lt;/tt&gt; used by &lt;tt&gt;OplogFetcher&lt;/tt&gt;&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0ed9472dc8c2f85e957052f01336b1247c7a6e75/src/mongo/db/repl/oplog.h#L52&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;OplogSlot&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="593149">SERVER-36815</key>
            <summary>Remove the references of hash field of oplog entry</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="samy.lanka@mongodb.com">Samyukta Lanka</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Thu, 23 Aug 2018 00:53:23 +0000</created>
                <updated>Sun, 29 Oct 2023 22:28:43 +0000</updated>
                            <resolved>Thu, 17 Jan 2019 21:00:09 +0000</resolved>
                                                    <fixVersion>4.1.8</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2150311" author="siyuan.zhou@10gen.com" created="Thu, 14 Feb 2019 22:40:23 +0000"  >&lt;p&gt;Alternatively, we can make OplogEntryBase not strict about unknown fields in 4.4.&lt;/p&gt;</comment>
                            <comment id="2146676" author="siyuan.zhou@10gen.com" created="Tue, 12 Feb 2019 22:50:08 +0000"  >&lt;p&gt;Shall we gate writing hash with FCV 4.0 then? If 4.2 still write it, 4.4 will see it and have to accept it for FCV 4.2 so that we cannot remove the optional field, right?&lt;/p&gt;</comment>
                            <comment id="2146600" author="samy.lanka" created="Tue, 12 Feb 2019 21:49:32 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=siyuan.zhou&quot; class=&quot;user-hover&quot; rel=&quot;siyuan.zhou&quot;&gt;siyuan.zhou&lt;/a&gt;, yes this was because without writing the hash in the oplog it was failing multiversion tests. For now it is optional though, I&apos;m not sure we can remove it altogether yet because of multiversion compatibility. I think we agree that we&apos;d remove it as a part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36334&quot; title=&quot;Disallow setting &amp;quot;h&amp;quot; field in oplog entries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36334&quot;&gt;&lt;del&gt;SERVER-36334&lt;/del&gt;&lt;/a&gt;. &lt;/p&gt;</comment>
                            <comment id="2146594" author="siyuan.zhou@10gen.com" created="Tue, 12 Feb 2019 21:43:23 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=samy.lanka&quot; class=&quot;user-hover&quot; rel=&quot;samy.lanka&quot;&gt;samy.lanka&lt;/a&gt;, it seems we still &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4f858c52b05ecc49d2ae19bbaf59fc0aad445b7e/src/mongo/db/repl/oplog.cpp#L428&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;write hash in oplog&lt;/a&gt;, is there any particular reason we left it alone? To be able to remove hash from the IDL in 4.4, we should stop writing hash into oplog in 4.2.&lt;/p&gt;</comment>
                            <comment id="2118855" author="xgen-internal-githook" created="Thu, 17 Jan 2019 20:59:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;lankas&apos;, &apos;email&apos;: &apos;samy.lanka@mongodb.com&apos;, &apos;name&apos;: &apos;Samy Lanka&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36815&quot; title=&quot;Remove the references of hash field of oplog entry&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36815&quot;&gt;&lt;del&gt;SERVER-36815&lt;/del&gt;&lt;/a&gt; Remove references to oplog entry&apos;s hash field&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d764e1b6346726fc2e9259ba294d029d531ff38e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d764e1b6346726fc2e9259ba294d029d531ff38e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2026856" author="judah.schvimer" created="Mon, 8 Oct 2018 17:52:45 +0000"  >&lt;p&gt;This should include making the &quot;h&quot; field optional in the IDL.&lt;/p&gt;</comment>
                            <comment id="1984174" author="siyuan.zhou@10gen.com" created="Thu, 23 Aug 2018 19:08:51 +0000"  >&lt;p&gt;I think they are different, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36334&quot; title=&quot;Disallow setting &amp;quot;h&amp;quot; field in oplog entries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36334&quot;&gt;&lt;del&gt;SERVER-36334&lt;/del&gt;&lt;/a&gt; is about oplog entry format, which takes longer to remove due to backward compatibility, this one is about internal code clean-up.&lt;/p&gt;</comment>
                            <comment id="1983758" author="judah.schvimer" created="Thu, 23 Aug 2018 14:04:52 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=siyuan.zhou&quot; class=&quot;user-hover&quot; rel=&quot;siyuan.zhou&quot;&gt;siyuan.zhou&lt;/a&gt;, is this a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36334&quot; title=&quot;Disallow setting &amp;quot;h&amp;quot; field in oplog entries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36334&quot;&gt;&lt;del&gt;SERVER-36334&lt;/del&gt;&lt;/a&gt;?&lt;/p&gt;</comment>
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