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    <title>MongoDB Jira</title>
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    <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-2358] mongos autosplitting does not persist or calculate chunksize correctly</title>
                <link>https://jira.mongodb.org/browse/SERVER-2358</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There are several problems with the current strategy for chunk splitting. chunk splitting is (as of 1.7.4) based solely on the amount of &lt;b&gt;new&lt;/b&gt; data written to an existing chunk through a single mongos and only since that mongos was started. This is problematic when mongos is restarted or when multiple mongos instances are run because chunks do not get split as expected. &lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;_dataWritten (or really currentChunkSize as it&apos;s used) should be persisted to the config db and coordinated across multiple mongos instances&lt;/li&gt;
	&lt;li&gt;_dataWritten in the config db should be initialized from getPhysicalSize() when no value is present in the config db. it should never be initialized to a random value that does not represent actual size (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r1.7.4/s/chunk.cpp#L58&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r1.7.4/s/chunk.cpp#L58&lt;/a&gt;)&lt;/li&gt;
	&lt;li&gt;_dataWritten should not be re-set to 0, but should be set appropriately for each post-split chunk &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r1.7.4/s/chunk.cpp#L327&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r1.7.4/s/chunk.cpp#L327&lt;/a&gt; (if it is zero&apos;d out and the chunk is not split, it currently requires an additional (maxChunkSize / 2) of data to be written through that specific mongos before it will again be considered for a split.&lt;/li&gt;
	&lt;li&gt;post-split (in Chunk::multiSplit) each chunk should have it&apos;s _dataWritten initialized to getPhysicalSize()&lt;/li&gt;
	&lt;li&gt;_dataWritten is not updated on commands that use the multi=True flag&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="14219">SERVER-2358</key>
            <summary>mongos autosplitting does not persist or calculate chunksize correctly</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="jehiah">Jehiah Czebotar</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 Jan 2011 21:33:09 +0000</created>
                <updated>Thu, 19 Apr 2012 18:24:50 +0000</updated>
                            <resolved>Fri, 14 Jan 2011 19:52:27 +0000</resolved>
                                    <version>1.7.4</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="22362" author="alerner" created="Fri, 14 Jan 2011 19:52:09 +0000"  >&lt;p&gt;_dataWritten&apos;s purpose is to trigger the check for whether a split is needed nor the split itself. It need not be accurate, just frequent enough. In some cases you mentioned, it wasn&apos;t so in the 1.6 branch, and therefore we made the check mechanism to trigger more often.&lt;/p&gt;

&lt;p&gt;getPhysicalSize is an extremely expensive call, incidentally.&lt;/p&gt;

&lt;p&gt;The check and the decision to split are moving completely to the mongod side. 1.7, as far is this specific mechanism goes, is just an intermediate step &amp;#8211; and it has shown in our tests and beta&apos;s to be more reliable than the 1.6 version of the same mechanism. Please feel free to contribute more data about your actual tests, if you have so.&lt;/p&gt;
</comment>
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