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    <title>MongoDB Jira</title>
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    <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-26956] Remove moveChunk from sharding/cursor_timeout.js and fix test</title>
                <link>https://jira.mongodb.org/browse/SERVER-26956</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Executing a migration in cursor_timeout.js appears to have no purpose. There isn&apos;t even an assert that the migration succeeded. ensurePrimaryShard (already done in the test) is sufficient to assure that the data is on a specific shard.&lt;/p&gt;

&lt;p&gt;The moveChunk operation in fact fails every time with a ChunkTooBig error. And then the mongod connected cursor is created against the moveChunk&apos;s source shard. So if the moveChunk does succeed, the test actually fails because the cursor is opened against a shard that does not have that collection and thus .next() on that cursor fails.&lt;/p&gt;

&lt;p&gt;Instead of inserting 200 documents, the test should insert far fewer and include a batchSize setting on the find commands to ensure that the cursor remains open. There is then also no reason to insert huge documents: documents with a string field with length 2^17. Perhaps the huge documents were because there was or is a data size limit on cursor returns, but batchSize should take care of it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="330567">SERVER-26956</key>
            <summary>Remove moveChunk from sharding/cursor_timeout.js and fix test</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="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Tue, 8 Nov 2016 21:28:27 +0000</created>
                <updated>Tue, 6 Dec 2022 04:12:15 +0000</updated>
                            <resolved>Mon, 23 Oct 2017 15:04:51 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1706137" author="dianna.hohensee" created="Mon, 23 Oct 2017 15:03:11 +0000"  >&lt;p&gt;cursor_timeout.js has been &lt;a href=&quot;https://github.com/mongodb/mongo/commit/4d301a60b68fcc7cfad8499a0fe60c758da45f3e#diff-8aa25402c83c1dc65eb93e3b0ba5cb57&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;modified&lt;/a&gt; by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28414&quot; title=&quot;sharding/cursor_timeout.js can timeout between find &amp;amp; getMore call when under load&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28414&quot;&gt;&lt;del&gt;SERVER-28414&lt;/del&gt;&lt;/a&gt; since this ticket was filed, and this problem has gone away. The &lt;/p&gt;
{chunkSize: 1}
&lt;p&gt; parameter was removed from the ShardingTest instantiated in cursor_timeout.js, so the migration can now succeed without a ChunkTooBig error and is asserted to succeeded.&lt;/p&gt;</comment>
                            <comment id="1430185" author="dianna.hohensee" created="Wed, 9 Nov 2016 15:24:34 +0000"  >&lt;p&gt;It&apos;s possible that this JS test was originally intended to exercise the mongos&apos; parallel query of multiple shards, with timeout of those cursors. In which case, the moveChunk should be kept, but splitChunk added.&lt;/p&gt;</comment>
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