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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-14394] Create initial chunks directly on shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-14394</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It would be useful to be able to create initial hashed shard key chunks directly on shards, instead of creating them on one shard and then distributing.&lt;/p&gt;

&lt;p&gt;Specifically, when the balancer is busy doing a long balancer run and it won&apos;t be able to balance out those empty hashed key chunks right way.&lt;/p&gt;</description>
                <environment></environment>
        <key id="144638">SERVER-14394</key>
            <summary>Create initial chunks directly on shards</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="cheahuychou.mao@mongodb.com">Cheahuychou Mao</assignee>
                                    <reporter username="alex.komyagin@mongodb.com">Alexander Komyagin</reporter>
                        <labels>
                    </labels>
                <created>Mon, 30 Jun 2014 17:16:27 +0000</created>
                <updated>Fri, 24 Jul 2020 15:11:33 +0000</updated>
                            <resolved>Tue, 31 Jul 2018 21:52:35 +0000</resolved>
                                    <version>2.4.10</version>
                                    <fixVersion>4.0.2</fixVersion>
                    <fixVersion>4.1.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>15</watches>
                                                                                                                <comments>
                            <comment id="1981902" author="xgen-internal-githook" created="Tue, 21 Aug 2018 21:55:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;cheahuychou.mao@mongodb.com&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14394&quot; title=&quot;Create initial chunks directly on shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14394&quot;&gt;&lt;del&gt;SERVER-14394&lt;/del&gt;&lt;/a&gt; Create initial hashed shard key chunks directly on shards&lt;/p&gt;

&lt;p&gt;(cherry picked from commit d83b73ea2db96ccbcf5f2a0710f360f88896ab9c)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6e85d023feb6e87ba476108f4f6f149e4bd2449d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6e85d023feb6e87ba476108f4f6f149e4bd2449d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1981725" author="greg.mckeon" created="Tue, 21 Aug 2018 20:09:20 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=janna.golden&quot; class=&quot;user-hover&quot; rel=&quot;janna.golden&quot;&gt;janna.golden&lt;/a&gt; this seems to be partially committed. Can you take a look and finish it off?&lt;/p&gt;</comment>
                            <comment id="1979265" author="xgen-internal-githook" created="Fri, 17 Aug 2018 20:01:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;cheahuychou.mao@mongodb.com&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14394&quot; title=&quot;Create initial chunks directly on shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14394&quot;&gt;&lt;del&gt;SERVER-14394&lt;/del&gt;&lt;/a&gt; Move the intial split code to a separate module and add unit tests&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 4dd46fb7bdc6d3ef62888b01f585d6fed54a081f)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9fc1c55c9648c9c9a49ddbcd7914cf2d56a9bcd4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9fc1c55c9648c9c9a49ddbcd7914cf2d56a9bcd4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1978048" author="xgen-internal-githook" created="Thu, 16 Aug 2018 21:24:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14394&quot; title=&quot;Create initial chunks directly on shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14394&quot;&gt;&lt;del&gt;SERVER-14394&lt;/del&gt;&lt;/a&gt; Add UUID checking to the hashed sharding with initial split test&lt;/p&gt;

&lt;p&gt;(cherry picked from commit fc372cdf9a070eecaf600b75649fd2690c3d927d)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d94a1c5debcbb0d2e23f38c9552bb1c281978bb9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d94a1c5debcbb0d2e23f38c9552bb1c281978bb9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1962165" author="xgen-internal-githook" created="Tue, 31 Jul 2018 21:51:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;cheahuychou&apos;, &apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;cheahuychou.mao@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14394&quot; title=&quot;Create initial chunks directly on shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14394&quot;&gt;&lt;del&gt;SERVER-14394&lt;/del&gt;&lt;/a&gt; Create initial hashed shard key chunks directly on shards&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d83b73ea2db96ccbcf5f2a0710f360f88896ab9c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d83b73ea2db96ccbcf5f2a0710f360f88896ab9c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1959410" author="xgen-internal-githook" created="Sun, 29 Jul 2018 03:11:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sara Golemon&apos;, &apos;email&apos;: &apos;sara.golemon@mongodb.com&apos;, &apos;username&apos;: &apos;sgolemon&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14394&quot; title=&quot;Create initial chunks directly on shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14394&quot;&gt;&lt;del&gt;SERVER-14394&lt;/del&gt;&lt;/a&gt; Fix initial_split_policy_test on macOS&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/afca554216dfa32cbf92374a828451cdb1e04b8a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/afca554216dfa32cbf92374a828451cdb1e04b8a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1958687" author="xgen-internal-githook" created="Fri, 27 Jul 2018 16:18:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;cheahuychou.mao@mongodb.com&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14394&quot; title=&quot;Create initial chunks directly on shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14394&quot;&gt;&lt;del&gt;SERVER-14394&lt;/del&gt;&lt;/a&gt; Move the intial split code to a separate module and add unit tests&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4dd46fb7bdc6d3ef62888b01f585d6fed54a081f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4dd46fb7bdc6d3ef62888b01f585d6fed54a081f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1958131" author="xgen-internal-githook" created="Fri, 27 Jul 2018 03:47:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;cheahuychou&apos;, &apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;cheahuychou.mao@mongodb.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14394&quot; title=&quot;Create initial chunks directly on shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14394&quot;&gt;&lt;del&gt;SERVER-14394&lt;/del&gt;&lt;/a&gt; Move the intial split code to a separate module and add unit tests&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 37c95d3ee26b99817fdda6fdfc0b3f867e04aa84.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4dc7dc996cb05bc11f4c474899dfb32810baa8bb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4dc7dc996cb05bc11f4c474899dfb32810baa8bb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1957965" author="xgen-internal-githook" created="Thu, 26 Jul 2018 21:30:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;cheahuychou.mao@mongodb.com&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14394&quot; title=&quot;Create initial chunks directly on shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14394&quot;&gt;&lt;del&gt;SERVER-14394&lt;/del&gt;&lt;/a&gt; Move the intial split code to a separate module and add unit tests&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/37c95d3ee26b99817fdda6fdfc0b3f867e04aa84&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/37c95d3ee26b99817fdda6fdfc0b3f867e04aa84&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1953640" author="xgen-internal-githook" created="Mon, 23 Jul 2018 14:42:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14394&quot; title=&quot;Create initial chunks directly on shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14394&quot;&gt;&lt;del&gt;SERVER-14394&lt;/del&gt;&lt;/a&gt; Add UUID checking to the hashed sharding with initial split test&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fc372cdf9a070eecaf600b75649fd2690c3d927d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fc372cdf9a070eecaf600b75649fd2690c3d927d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1752311" author="kaloian.manassiev" created="Thu, 14 Dec 2017 19:36:12 +0000"  >&lt;p&gt;Moving to the &quot;unshardec collections&quot; Epic, because I think this would make it simpler to directly write the initial chunks on the config server instead of using the moveChunk machinery.&lt;/p&gt;</comment>
                            <comment id="646050" author="sflint@sailthru.com" created="Wed, 2 Jul 2014 16:17:15 +0000"  >&lt;p&gt;I believe my use case is before any information is actually written to the collection.   I am pre creating collections 6 days ahead of time.  I understand the race condition if records were being inserted. I would assume you can detect insertion at creation and decide how to proceed?&lt;/p&gt;

&lt;p&gt;I am looking forward to this.   Thanks&lt;/p&gt;</comment>
                            <comment id="639257" author="greg_10gen" created="Mon, 30 Jun 2014 21:28:49 +0000"  >&lt;p&gt;&amp;gt; Why is this necessary? Could they not be distributed at creation?&lt;br/&gt;
No, the chunks are created by some mongos (call it mongos A).  If another mongos (mongos B) or mongoses are actively inserting into the collection in question on the primary shard while the collection is getting sharded, there&apos;s a race where the mongos B inserts may make it to the shard before mongos A tells the shard that it no longer owns the whole collection (this is the race migrations are designed to avoid).  It&apos;s okay so long as the new chunks created are all on the primary shard to begin with.&lt;/p&gt;

&lt;p&gt;The change is scheduled, note the fixVersion, but it&apos;s unfortunately not simple.&lt;/p&gt;</comment>
                            <comment id="639150" author="sflint@sailthru.com" created="Mon, 30 Jun 2014 20:01:40 +0000"  >&lt;p&gt;I am not sure because i haven&apos;t looked at the code, but I know at the time of sharding a collection mongos knows that it will create 2* shards as chunks... so 4 shards 8 chunks.  But they are created on the primary shard then moved?  Why is this necessary?   Could they not be distributed at creation?   I ran into this issue because the balancer was doing a round so I have 8 chunks on the primary shard and it would have never balanced them in time for the application to start writing to the collection.    &lt;/p&gt;

&lt;p&gt;I would like these to be separate threads for the balancer.  If the balancer is busy doing a balancing round chunks should still be evenly distributed in a new hashed collection that is created.&lt;/p&gt;

&lt;p&gt;In the current case I would have to stop the balancer(which is not easy) to create the collection and have 8 chunks be distributed into 2,2,2,2. &lt;/p&gt;</comment>
                            <comment id="639113" author="greg_10gen" created="Mon, 30 Jun 2014 19:26:32 +0000"  >&lt;p&gt;This requires moving the shardCollection command to the primary database shard - it&apos;s unsafe to do this from mongos as the shardCollection command works now.&lt;/p&gt;</comment>
                            <comment id="639039" author="thomasr" created="Mon, 30 Jun 2014 18:33:16 +0000"  >&lt;p&gt;FYI: A similar request (maybe more general) was made in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14298&quot; title=&quot;Add support to create/define chunks in a given shard for empty collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14298&quot;&gt;&lt;del&gt;SERVER-14298&lt;/del&gt;&lt;/a&gt;. If the new collection is empty (no data needs to be migrated), it would be good if the chunk distribution can be generated in a way that the chunks live directly on the target shards, rather than using the moveChunk mechanism to move them one by one.&lt;/p&gt;

&lt;p&gt;I&apos;m keeping both tickets open. This one is to track the feature request to create the chunk distribution directly on the target shards for empty hashed sharded collections. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14298&quot; title=&quot;Add support to create/define chunks in a given shard for empty collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14298&quot;&gt;&lt;del&gt;SERVER-14298&lt;/del&gt;&lt;/a&gt; tracks in a more general way a user-facing feature that allows to specify a custom chunk distribution manually for empty collections&quot;. &lt;/p&gt;</comment>
                            <comment id="639010" author="sflint@sailthru.com" created="Mon, 30 Jun 2014 18:12:57 +0000"  >&lt;p&gt;This is critical if you are adding in a new collection and need it to be distributed immediately.&lt;/p&gt;

&lt;p&gt;Thanks&lt;/p&gt;</comment>
                    </comments>
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