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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-26528] Add additional logging when sync source is changed or cleared</title>
                <link>https://jira.mongodb.org/browse/SERVER-26528</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Sometimes we get log messages like &quot;SyncSourceFeedback error sending update to WIN-K6DURTQEFVN:20012: InvalidSyncSource: Sync target is no longer valid&quot; that don&apos;t tell you &lt;b&gt;why&lt;/b&gt; the sync target is no longer valid.  We should log any time we decide to clear our current sync source why we are doing so.&lt;/p&gt;</description>
                <environment></environment>
        <key id="322145">SERVER-26528</key>
            <summary>Add additional logging when sync source is changed or cleared</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="judah.schvimer@mongodb.com">Judah Schvimer</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Fri, 7 Oct 2016 20:27:22 +0000</created>
                <updated>Wed, 5 Apr 2017 11:42:28 +0000</updated>
                            <resolved>Fri, 16 Dec 2016 21:57:29 +0000</resolved>
                                                    <fixVersion>3.4.2</fixVersion>
                    <fixVersion>3.5.2</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1466087" author="judah.schvimer" created="Wed, 28 Dec 2016 19:58:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;judahschvimer&apos;, u&apos;name&apos;: u&apos;Judah Schvimer&apos;, u&apos;email&apos;: u&apos;judah@mongodb.com&apos;}

&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26538&quot; title=&quot;Use C++11 thread_local for all thread-specific-data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26538&quot;&gt;&lt;del&gt;SERVER-26538&lt;/del&gt;&lt;/a&gt; improve sync source change logging&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 0cd2bf29d5798a395a07e67ae79ede9a5cefd411)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/74a8068d7d955dd1d0fcc3d9155d771cd5af0bac&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/74a8068d7d955dd1d0fcc3d9155d771cd5af0bac&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1460268" author="judah.schvimer" created="Fri, 16 Dec 2016 21:57:05 +0000"  >&lt;p&gt;Committed with the wrong ticket number&lt;br/&gt;
Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;judahschvimer&apos;, u&apos;name&apos;: u&apos;Judah Schvimer&apos;, u&apos;email&apos;: u&apos;judah@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26538&quot; title=&quot;Use C++11 thread_local for all thread-specific-data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26538&quot;&gt;&lt;del&gt;SERVER-26538&lt;/del&gt;&lt;/a&gt; improve sync source change logging&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0cd2bf29d5798a395a07e67ae79ede9a5cefd411&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0cd2bf29d5798a395a07e67ae79ede9a5cefd411&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1453902" author="judah.schvimer" created="Fri, 9 Dec 2016 16:22:16 +0000"  >&lt;p&gt;Whenever we see &quot;could not find member to sync from&quot; it should be clear why we tried to choose a new sync source in the first place.&lt;/p&gt;</comment>
                            <comment id="1417560" author="judah.schvimer" created="Tue, 25 Oct 2016 22:22:54 +0000"  >&lt;p&gt;There are also times when TopologyCoordinatorImpl::shouldChangeSyncSource() returns true and we don&apos;t log the reason why: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c9b9187faa1c29553e4841761803fa8cbee55f18/src/mongo/db/repl/topology_coordinator_impl.cpp#L2450&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/c9b9187faa1c29553e4841761803fa8cbee55f18/src/mongo/db/repl/topology_coordinator_impl.cpp#L2450&lt;/a&gt;. This does not happen very often, so it would be good to log.&lt;/p&gt;</comment>
                            <comment id="1417557" author="judah.schvimer" created="Tue, 25 Oct 2016 22:18:23 +0000"  >&lt;p&gt;One change should definitely be &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c9b9187faa1c29553e4841761803fa8cbee55f18/src/mongo/db/repl/topology_coordinator_impl.cpp#L2465-L2469&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here:&lt;/a&gt; &quot;re-evaluating sync source...&quot; should include the sync source. &lt;/p&gt;</comment>
                            <comment id="1403354" author="spencer" created="Fri, 7 Oct 2016 20:32:15 +0000"  >&lt;p&gt;Agreed, but we need to also include &lt;b&gt;why&lt;/b&gt; we&apos;re changing or clearing it.&lt;/p&gt;</comment>
                            <comment id="1403352" author="milkie" created="Fri, 7 Oct 2016 20:31:34 +0000"  >&lt;p&gt;It&apos;s not just when we clear it, it&apos;s whenever it changes.  We should probably just change the message to say &quot;Sync source changed to xxxx&quot; or &quot;Sync source was cleared&quot; as appropriate.&lt;/p&gt;</comment>
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            <issuekey id="240957">SERVER-21656</issuekey>
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            <issuekey id="335295">SERVER-27237</issuekey>
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