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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>
    </build-info>


<item>
            <title>[SERVER-44052] Inconsistencies in sharded collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-44052</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Mongos is reporting inconsistent information for sharded collections.&lt;/p&gt;

&lt;p&gt;&lt;ins&gt;Our Setup:&lt;/ins&gt;&lt;/p&gt;

&lt;p&gt;A DB Cluster with three shards. Each shard has PSA Architecture. Three config servers.&lt;/p&gt;

&lt;p&gt;Mongo Versions: 4.0.X&lt;/p&gt;

&lt;p&gt;&lt;ins&gt;Scenario:&lt;/ins&gt;&lt;/p&gt;

&lt;p&gt;&lt;b&gt;&lt;font color=&quot;#172b4d&quot;&gt;Mongos reports that collection alerts_20191026 is not sharded. But config.chunks reports that there are three chunks for that namespace that are in different shards&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;mongos&amp;gt; db.alerts_20191026.getShardDistribution()&lt;/p&gt;

&lt;p&gt;&lt;font color=&quot;#de350b&quot;&gt;&lt;em&gt;Collection hitron.alerts_20191026 is not sharded.&lt;/em&gt;&lt;/font&gt;&lt;/p&gt;

&lt;p&gt;mongos&amp;gt; use config&lt;/p&gt;

&lt;p&gt;switched to db config&lt;/p&gt;

&lt;p&gt;mongos&amp;gt; db.chunks.find({ns: &quot;hitron.alerts_20191026&quot;})&lt;/p&gt;

&lt;p&gt;&lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;{ &quot;_id&quot; : &quot;hitron.alerts_20191026-lineId_-3074457345618258602&quot;, &quot;lastmod&quot; : Timestamp(2, 0), &quot;lastmodEpoch&quot; : ObjectId(&quot;5da687c8a664d0a846cf713f&quot;), &quot;ns&quot; : &quot;hitron.alerts_20191026&quot;, &quot;min&quot; : \{ &quot;lineId&quot; : NumberLong(&quot;-3074457345618258602&quot;) }, &quot;max&quot; : { &quot;lineId&quot; : NumberLong(&quot;3074457345618258602&quot;) }, &lt;b&gt;&quot;shard&quot; : &quot;rs2&quot;&lt;/b&gt;, &quot;history&quot; : [ { &quot;validAfter&quot; : Timestamp(1571194825, 261), &quot;shard&quot; : &quot;rs2&quot; }, { &quot;validAfter&quot; : Timestamp(1571194824, 926), &quot;shard&quot; : &quot;rs1&quot; } ] }&lt;/font&gt;&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;&lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;{ &quot;_id&quot; : &quot;hitron.alerts_20191026-lineId_3074457345618258602&quot;, &quot;lastmod&quot; : Timestamp(3, 0), &quot;lastmodEpoch&quot; : ObjectId(&quot;5da687c8a664d0a846cf713f&quot;), &quot;ns&quot; : &quot;hitron.alerts_20191026&quot;, &quot;min&quot; : \{ &quot;lineId&quot; : NumberLong(&quot;3074457345618258602&quot;) }, &quot;max&quot; : { &quot;lineId&quot; : { &quot;$maxKey&quot; : 1 } }, &lt;b&gt;&quot;shard&quot; : &quot;rs3&quot;&lt;/b&gt;, &quot;history&quot; : [ { &quot;validAfter&quot; : Timestamp(1571194825, 616), &quot;shard&quot; : &quot;rs3&quot; }, { &quot;validAfter&quot; : Timestamp(1571194824, 926), &quot;shard&quot; : &quot;rs1&quot; } ] }&lt;/font&gt;&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;&lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;{ &quot;_id&quot; : &quot;hitron.alerts_20191026-lineId_MinKey&quot;, &quot;lastmod&quot; : Timestamp(3, 1), &quot;lastmodEpoch&quot; : ObjectId(&quot;5da687c8a664d0a846cf713f&quot;), &quot;ns&quot; : &quot;hitron.alerts_20191026&quot;, &quot;min&quot; : { &quot;lineId&quot; : { &quot;$minKey&quot; : 1 } }, &quot;max&quot; : { &quot;lineId&quot; : NumberLong(&quot;-3074457345618258602&quot;) }, &lt;b&gt;&quot;shard&quot; : &quot;rs1&quot;&lt;/b&gt;, &quot;history&quot; : [ { &quot;validAfter&quot; : Timestamp(1571194824, 926), &quot;shard&quot; : &quot;rs1&quot; } ] }&lt;/font&gt;&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;&lt;font color=&quot;#172b4d&quot;&gt;mongos&amp;gt; db.alerts_20191026.stats().nchunks&lt;br/&gt;
&lt;font color=&quot;#de350b&quot;&gt;&lt;/font&gt;&lt;em&gt;1&lt;/em&gt;&lt;/font&gt;&lt;font color=&quot;&quot;&gt;&lt;br/&gt;
&lt;br/&gt;
&lt;font color=&quot;#172b4d&quot;&gt;&lt;/font&gt;mongos&amp;gt; sh.status()&lt;/font&gt;&lt;/p&gt;

&lt;p&gt;&lt;font color=&quot;#de350b&quot;&gt; &lt;em&gt;hitron.alerts_20191026&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;shard key: { &quot;lineId&quot; : &quot;hashed&quot; }&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;unique: false&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;balancing: true&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;chunks:&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;rs1 1&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;rs2 1&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;rs3 1&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;{ &quot;lineId&quot; : { &quot;$minKey&quot; : 1 } } --&amp;gt;&amp;gt; { &quot;lineId&quot; : NumberLong(&quot;-3074457345618258602&quot;) } on : rs1 Timestamp(3, 1)&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;{ &quot;lineId&quot; : NumberLong(&quot;-3074457345618258602&quot;) } --&amp;gt;&amp;gt; { &quot;lineId&quot; : NumberLong(&quot;3074457345618258602&quot;) } on : rs2 Timestamp(2, 0)&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;{ &quot;lineId&quot; : NumberLong(&quot;3074457345618258602&quot;) } --&amp;gt;&amp;gt; { &quot;lineId&quot; : { &quot;$maxKey&quot; : 1 } } on : rs3 Timestamp(3, 0)&lt;/em&gt;&lt;/font&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="971425">SERVER-44052</key>
            <summary>Inconsistencies in sharded collections</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="4">Incomplete</resolution>
                                        <assignee username="carl.champain@mongodb.com">Carl Champain</assignee>
                                    <reporter username="sadithela@assia-inc.com">Stephen Paul Adithela</reporter>
                        <labels>
                    </labels>
                <created>Wed, 16 Oct 2019 19:51:30 +0000</created>
                <updated>Tue, 25 Feb 2020 20:29:43 +0000</updated>
                            <resolved>Tue, 25 Feb 2020 20:29:43 +0000</resolved>
                                    <version>4.0.2</version>
                    <version>4.0.4</version>
                    <version>4.0.5</version>
                                                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="2908367" author="carl.champain" created="Tue, 25 Feb 2020 20:29:34 +0000"  >&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;We haven&#8217;t heard back from you for some time, so I&#8217;m going to mark this ticket as resolved. If this is still an issue for you, please provide additional information and we will reopen the ticket.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Carl&lt;br/&gt;
&#160;&lt;/p&gt;</comment>
                            <comment id="2581033" author="carl.champain" created="Tue, 3 Dec 2019 22:56:36 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sadithela%40assia-inc.com&quot; class=&quot;user-hover&quot; rel=&quot;sadithela@assia-inc.com&quot;&gt;sadithela@assia-inc.com&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=icruz&quot; class=&quot;user-hover&quot; rel=&quot;icruz&quot;&gt;icruz&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for the additional details on the topology of your sharded cluster.&lt;br/&gt;
 In order to be able to recreate your issue, we need some more information and context, can you please provide:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;The names of the database commands you run?&lt;/li&gt;
	&lt;li&gt;The order in which you run them?&lt;/li&gt;
	&lt;li&gt;Where they are being run in the topology?&lt;/li&gt;
&lt;/ol&gt;
</comment>
                            <comment id="2564092" author="icruz" created="Mon, 25 Nov 2019 10:55:25 +0000"  >&lt;p&gt;Hi Carl,&lt;/p&gt;

&lt;p&gt;we have a sharded cluster, with 4 shards, each consisting on a replica set with 2 replicas + 1 arbiter.&lt;/p&gt;

&lt;p&gt;Then we have 2 separate app servers, with our java app connecting to a local mongos on each of these app servers. From these java apps we are creating everyday some collections for the future days (several collections per day), and it is here where we shard the collections. When this issue happens, it happens for all collections created at that point. One of the things (not sure if it might affect), is that we are creating these collections in parallel from app servers (different collections, but calling shardCollection at the same time on different mongos instances)&lt;/p&gt;</comment>
                            <comment id="2554379" author="carl.champain" created="Wed, 20 Nov 2019 19:13:00 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sadithela%40assia-inc.com&quot; class=&quot;user-hover&quot; rel=&quot;sadithela@assia-inc.com&quot;&gt;sadithela@assia-inc.com&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=icruz&quot; class=&quot;user-hover&quot; rel=&quot;icruz&quot;&gt;icruz&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for your patience.&lt;/p&gt;

&lt;p&gt;We think that the issue explained in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32198&quot; title=&quot;Missing collection metadata on the shard implies both UNSHARDED and &amp;quot;metadata not loaded yet&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32198&quot;&gt;&lt;del&gt;SERVER-32198&lt;/del&gt;&lt;/a&gt; is the cause of the described behavior here. To put it simply, the &lt;tt&gt;mongos&lt;/tt&gt; and the &lt;tt&gt;mongod&lt;/tt&gt; have outdated metadata. For example, the shard version is set to unsharded for the &lt;tt&gt;alerts_20191111&lt;/tt&gt; collection (even though it is in fact sharded), so the output of &lt;tt&gt;getShardDistribution()&lt;/tt&gt; or &lt;tt&gt;stats()&lt;/tt&gt; return an incorrect state. If only one &lt;tt&gt;mongos&lt;/tt&gt; or &lt;tt&gt;mongod&lt;/tt&gt; was outdated, then the most recent one would tell the other to update its version, hence this problem wouldn&apos;t happen. Importantly, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32198&quot; title=&quot;Missing collection metadata on the shard implies both UNSHARDED and &amp;quot;metadata not loaded yet&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32198&quot;&gt;&lt;del&gt;SERVER-32198&lt;/del&gt;&lt;/a&gt; is an open ticket, meaning that it is still being examined, so please watch it for updates.&lt;/p&gt;

&lt;p&gt;We weren&#8217;t able to reproduce the issue that causes the &lt;tt&gt;mongod&lt;/tt&gt; to have out of date metadata, but we&apos;d be happy to try again. To do so, we would need a complete list of steps, plus the topology of your sharded cluster.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Carl&lt;/p&gt;</comment>
                            <comment id="2535797" author="icruz" created="Tue, 12 Nov 2019 08:31:09 +0000"  >&lt;p&gt;Sorry for late reply, the response we get from java is &quot;ok: 1&quot;, no error.&lt;/p&gt;</comment>
                            <comment id="2528565" author="carl.champain" created="Mon, 11 Nov 2019 15:48:41 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sadithela%40assia-inc.com&quot; class=&quot;user-hover&quot; rel=&quot;sadithela@assia-inc.com&quot;&gt;sadithela@assia-inc.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Have you found out what the java responses are?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Carl&#160;&lt;/p&gt;</comment>
                            <comment id="2515127" author="sadithela@assia-inc.com" created="Sat, 2 Nov 2019 01:42:23 +0000"  >&lt;p&gt;Hi Carl,&lt;/p&gt;

&lt;p&gt;I had uploaded a zip file called &quot;alerts_20191111&quot; to your secure uploader. It should have all the mongos, mongocfg, mongodb related logs. It should also have shardVersion output.&lt;/p&gt;

&lt;p&gt;Regarding java responses, I have to follow up with my colleagues.&lt;/p&gt;

&lt;p&gt;Sorry for late reply.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;/p&gt;

&lt;p&gt;Stephen&lt;/p&gt;</comment>
                            <comment id="2506759" author="carl.champain" created="Tue, 29 Oct 2019 15:34:19 +0000"  >&lt;p&gt;Hi again &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sadithela%40assia-inc.com&quot; class=&quot;user-hover&quot; rel=&quot;sadithela@assia-inc.com&quot;&gt;sadithela@assia-inc.com&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=icruz&quot; class=&quot;user-hover&quot; rel=&quot;icruz&quot;&gt;icruz&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;To help us look more into how the deployment reaches this state:&lt;/p&gt;

&lt;p&gt;1. Can you please run &lt;a href=&quot;https://docs.mongodb.com/manual/reference/method/db.collection.getShardVersion/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;getShardVersion()&lt;/a&gt;&#160;on shards which have chunks for the &lt;tt&gt;alerts_20191030&lt;/tt&gt; collection (or any collection affected by the described behavior)&#160;and share the output?&#160;&lt;/p&gt;

&lt;p&gt;2. In the Java code, what response(s) are returned by the shardCollection commands?&lt;/p&gt;

&lt;p&gt;3. Can you provide the logs from the mongos, shard primary and config servers?&lt;/p&gt;

&lt;p&gt;Ideally, please provide these all for the same improperly sharded collection.&lt;/p&gt;

&lt;p&gt;Please upload your files to our secure uploader &lt;a href=&quot;https://10gen-httpsupload.s3.amazonaws.com/upload_forms/45cc72ba-9634-46f0-8ec8-1c8234fb8757.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. Only MongoDB engineers can view these files and they will expire after a period time.&lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
 Carl&lt;/p&gt;</comment>
                            <comment id="2505538" author="carl.champain" created="Mon, 28 Oct 2019 20:06:55 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sadithela%40assia-inc.com&quot; class=&quot;user-hover&quot; rel=&quot;sadithela@assia-inc.com&quot;&gt;sadithela@assia-inc.com&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=icruz&quot; class=&quot;user-hover&quot; rel=&quot;icruz&quot;&gt;icruz&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Very sorry for the confusion about the Java code. I re-opened the ticket for additional investigation.&lt;/p&gt;

&lt;p&gt;You mentioned that you dropped and re-sharded the collection; I want to make sure that you are aware of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17397&quot; title=&quot;Dropping a Database or Collection in a Sharded Cluster may not fully succeed&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17397&quot;&gt;&lt;del&gt;SERVER-17397&lt;/del&gt;&lt;/a&gt; which provides a way to do so properly. &lt;/p&gt;

&lt;p&gt;Back to your initial issue, we are currently investigating what the cause might be and are attempting to reproduce the described behavior. We will keep you updated and will reach out if questions come up.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Carl&lt;/p&gt;</comment>
                            <comment id="2499441" author="icruz" created="Thu, 24 Oct 2019 16:27:56 +0000"  >&lt;p&gt;That difference is due to &lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/shardCollection/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;shardCollection command&lt;/a&gt; vs &lt;a href=&quot;https://docs.mongodb.com/manual/reference/method/sh.shardCollection/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sh.shardCollection&lt;/a&gt; helper, which have a different syntax.&lt;/p&gt;

&lt;p&gt;Only differences between java code and shell are:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;In java we are using numInitialChunks parameter, while on shell we use the default.&lt;/li&gt;
	&lt;li&gt;In java there are several servers issuing a shardCollection command (for different collections) at the same time. Not sure if this concurrent shardCollection might cause the bug.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Please reopen this ticket because it is indeed a server bug, no matter what we do from a client, the DB should not end up with an inconsistent sharding configuration.&lt;/p&gt;</comment>
                            <comment id="2499261" author="carl.champain" created="Thu, 24 Oct 2019 15:09:24 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sadithela%40assia-inc.com&quot; class=&quot;user-hover&quot; rel=&quot;sadithela@assia-inc.com&quot;&gt;sadithela@assia-inc.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;In the Java code, you are using &lt;tt&gt;key&lt;/tt&gt; as the hashed key:&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;
&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;
		&lt;tbody &gt;
				&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;  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;new BasicDBObject(&quot;shardCollection&quot;, collection.getFullName())&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;                         .append(&quot;key&quot;, new BasicDBObject(shardKey, &quot;hashed&quot;))&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;                         .append(&quot;numInitialChunks&quot;, shardCount))&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;&#160;&lt;/p&gt;

&lt;p&gt;This is different from the shell code in which you are using &lt;tt&gt;lineId&lt;/tt&gt; as the hashed key:&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;
&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;
		&lt;tbody &gt;
				&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;  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; &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;sh.shardCollection(&apos;hitron.alerts_20191030&apos;,{lineId: &apos;hashed&apos;},false,{numInitialChunks: 3})&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;&#160;&lt;/p&gt;

&lt;p&gt;It seems that the Java code should be:&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;
&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;
		&lt;tbody &gt;
				&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;  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;new BasicDBObject(&quot;shardCollection&quot;, collection.getFullName())&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;                         .append(&quot;lineId&quot;, new BasicDBObject(shardKey, &quot;hashed&quot;))&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;                         .append(&quot;numInitialChunks&quot;, shardCount))&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;&#160;&lt;/p&gt;

&lt;p&gt;That said, the SERVER project is for bugs and feature suggestions for the MongoDB server. As this ticket does not appear to be a bug, I will now close it. If you need further assistance troubleshooting, I encourage you to ask our community by posting on the &lt;a href=&quot;https://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or on &lt;a href=&quot;https://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
 Carl&lt;/p&gt;</comment>
                            <comment id="2497975" author="sadithela@assia-inc.com" created="Wed, 23 Oct 2019 18:26:57 +0000"  >&lt;p&gt;Hi Carl,&lt;/p&gt;

&lt;p&gt;&lt;ins&gt;From mongo cli:&lt;/ins&gt;&lt;/p&gt;

&lt;p&gt;&lt;font color=&quot;#de350b&quot;&gt;&lt;em&gt;sh.shardCollection(&apos;hitron.alerts_20191030&apos;,{lineId: &apos;hashed&apos;},false,{numInitialChunks: 3})&lt;/em&gt;&lt;/font&gt;&lt;/p&gt;

&lt;p&gt;&lt;ins&gt;From java code:&lt;/ins&gt;&lt;/p&gt;

&lt;p&gt;Attached code snippet in file: &lt;font color=&quot;#de350b&quot;&gt;&lt;em&gt;&lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/235121/235121_shardcolcreation.txt&quot; title=&quot;shardcolcreation.txt attached to SERVER-44052&quot;&gt;shardcolcreation.txt&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt;&lt;/em&gt;&lt;/font&gt;&lt;/p&gt;</comment>
                            <comment id="2497959" author="carl.champain" created="Wed, 23 Oct 2019 18:15:42 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sadithela%40assia-inc.com&quot; class=&quot;user-hover&quot; rel=&quot;sadithela@assia-inc.com&quot;&gt;sadithela@assia-inc.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for sharing the stats. &lt;br/&gt;
I still need more details to determine what is happening. Can you please share some sample code showing how you created the collection via the Java driver and via the Shell?  &lt;/p&gt;</comment>
                            <comment id="2496642" author="sadithela@assia-inc.com" created="Tue, 22 Oct 2019 22:13:28 +0000"  >&lt;p&gt;Hi Carl,&lt;/p&gt;

&lt;p&gt;As this collection (alerts_20191026) has to be sharded for our production systems to work properly, We have dropped that collection and re-created again as a sharded collection from mongo CLI. That collection was initially created by java driver in our software.&lt;/p&gt;

&lt;p&gt;Right now, that collection&apos;s shard distribution output:&lt;/p&gt;

&lt;p&gt;&lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;Shard rs1 at rs1/hitron-db-01a:27018,hitron-db-01b:27018&lt;/font&gt;&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;data : 0B docs : 0 chunks : 1&lt;/font&gt;&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;estimated data per chunk : 0B&lt;/font&gt;&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;estimated docs per chunk : 0&lt;/font&gt;&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;&lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;Shard rs2 at rs2/hitron-db-02b:27018,hitron-db-02c:27018&lt;/font&gt;&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;data : 0B docs : 0 chunks : 1&lt;/font&gt;&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;estimated data per chunk : 0B&lt;/font&gt;&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;estimated docs per chunk : 0&lt;/font&gt;&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;&lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;Shard rs3 at rs3/hitron-db-03a:27018,hitron-db-03b:27018&lt;/font&gt;&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;data : 0B docs : 0 chunks : 1&lt;/font&gt;&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;estimated data per chunk : 0B&lt;/font&gt;&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;estimated docs per chunk : 0&lt;/font&gt;&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;&lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;Totals&lt;/font&gt;&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;data : 0B docs : 0 chunks : 3&lt;/font&gt;&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;Shard rs1 contains NaN% data, NaN% docs in cluster, avg obj size on shard : NaNGiB&lt;/font&gt;&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;Shard rs2 contains NaN% data, NaN% docs in cluster, avg obj size on shard : NaNGiB&lt;/font&gt;&lt;/em&gt;&lt;br/&gt;
 &lt;em&gt;&lt;font color=&quot;#de350b&quot;&gt;Shard rs3 contains NaN% data, NaN% docs in cluster, avg obj size on shard : NaNGiB&lt;/font&gt;&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;&lt;font color=&quot;#172b4d&quot;&gt;This is the right output we expect when we create a sharded collection.&#160;&lt;/font&gt;&lt;/p&gt;

&lt;p&gt;&lt;font color=&quot;#172b4d&quot;&gt;The collections being created from our software using java driver are still facing the same issue as mentioned in the description of this ticket.&lt;/font&gt;&lt;/p&gt;

&lt;p&gt;&lt;font color=&quot;#172b4d&quot;&gt;Here are results of a similar collection: (alerts_20191030)&lt;/font&gt;&lt;/p&gt;

&lt;p&gt;&lt;font color=&quot;#de350b&quot;&gt;mongos&amp;gt; db.alerts_20191030.getShardDistribution()&lt;/font&gt;&lt;br/&gt;
 &lt;em&gt;Collection hitron.alerts_20191030 is not sharded.&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;mongos&amp;gt; db.chunks.find({ns: &quot;hitron.alerts_20191030&quot;})&lt;br/&gt;
 &lt;font color=&quot;#de350b&quot;&gt;&lt;em&gt;{ &quot;_id&quot; : &quot;hitron.alerts_20191030-lineId_-3074457345618258602&quot;, &quot;lastmod&quot; : Timestamp(2, 0), &quot;lastmodEpoch&quot; : ObjectId(&quot;5dabcdd2a664d0a8465ae63b&quot;), &quot;ns&quot; : &quot;hitron.alerts_20191030&quot;, &quot;min&quot; : \{ &quot;lineId&quot; : NumberLong(&quot;-3074457345618258602&quot;) }, &quot;max&quot; : { &quot;lineId&quot; : NumberLong(&quot;3074457345618258602&quot;) }, &quot;shard&quot; : &quot;rs2&quot;, &quot;history&quot; : [ { &quot;validAfter&quot; : Timestamp(1571540435, 16), &quot;shard&quot; : &quot;rs2&quot; }, { &quot;validAfter&quot; : Timestamp(1571540434, 306), &quot;shard&quot; : &quot;rs1&quot; } ] }&lt;/em&gt;&lt;/font&gt;&lt;br/&gt;
 &lt;font color=&quot;#de350b&quot;&gt;&lt;em&gt;{ &quot;_id&quot; : &quot;hitron.alerts_20191030-lineId_3074457345618258602&quot;, &quot;lastmod&quot; : Timestamp(3, 0), &quot;lastmodEpoch&quot; : ObjectId(&quot;5dabcdd2a664d0a8465ae63b&quot;), &quot;ns&quot; : &quot;hitron.alerts_20191030&quot;, &quot;min&quot; :&lt;/em&gt; &lt;br/&gt;
 &lt;em&gt;{ &quot;lineId&quot; : NumberLong(&quot;3074457345618258602&quot;) }, &quot;max&quot; : { &quot;lineId&quot; : { &quot;$maxKey&quot; : 1 } }, &quot;shard&quot; : &quot;rs3&quot;, &quot;history&quot; : [ { &quot;validAfter&quot; : Timestamp(1571540435, 208), &quot;shard&quot; : &quot;rs3&quot; }, { &quot;validAfter&quot; : Timestamp(1571540434, 306), &quot;shard&quot; : &quot;rs1&quot; } ] }&lt;/em&gt;&lt;/font&gt;&lt;br/&gt;
 &lt;font color=&quot;#de350b&quot;&gt;&lt;em&gt;{ &quot;_id&quot; : &quot;hitron.alerts_20191030-lineId_MinKey&quot;, &quot;lastmod&quot; : Timestamp(3, 1), &quot;lastmodEpoch&quot; : ObjectId(&quot;5dabcdd2a664d0a8465ae63b&quot;), &quot;ns&quot; : &quot;hitron.alerts_20191030&quot;, &quot;min&quot; : { &quot;lineId&quot; : { &quot;$minKey&quot; : 1 } }, &quot;max&quot; : { &quot;lineId&quot; : NumberLong(&quot;-3074457345618258602&quot;) }, &quot;shard&quot; : &quot;rs1&quot;, &quot;history&quot; : [ { &quot;validAfter&quot; : Timestamp(1571540434, 306), &quot;shard&quot; : &quot;rs1&quot; } ] }&lt;/em&gt;&lt;/font&gt;&lt;/p&gt;

&lt;p&gt;Also, as you have mentioned, i am attaching collstats of alerts_20191030 collection to this ticket.&#160;&lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/234990/234990_alerts_20191030_stats.txt&quot; title=&quot;alerts_20191030_stats.txt attached to SERVER-44052&quot;&gt;alerts_20191030_stats.txt&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;Please let me know if you are in need of any other info.&lt;/p&gt;

&lt;p&gt;Thank you&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&lt;ins&gt;Useful Info:&lt;/ins&gt;&lt;/p&gt;

&lt;p&gt;mongo-java-driver version: 2.14.3&lt;/p&gt;

&lt;p&gt;mongo-async-driver version: 2.0.2&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="2492983" author="carl.champain" created="Mon, 21 Oct 2019 17:07:27 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sadithela%40assia-inc.com&quot; class=&quot;user-hover&quot; rel=&quot;sadithela@assia-inc.com&quot;&gt;sadithela@assia-inc.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the report.&lt;br/&gt;
Can you please run&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;
&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;
		&lt;tbody &gt;
				&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;  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;db.runCommand({ collStats : &quot;alerts_20191026&quot; })&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;in &lt;tt&gt;mongos&lt;/tt&gt; and share the output here?&#160;This will help me better understand what is happening.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Carl&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="469026">SERVER-32198</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
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                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="943358">SERVER-43689</issuekey>
        </issuelink>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="31950">SERVER-5160</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
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                <attachments>
                            <attachment id="234990" name="alerts_20191030_stats.txt" size="74515" author="sadithela@assia-inc.com" created="Tue, 22 Oct 2019 22:13:47 +0000"/>
                            <attachment id="235121" name="shardcolcreation.txt" size="1684" author="sadithela@assia-inc.com" created="Wed, 23 Oct 2019 18:26:41 +0000"/>
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