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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>[JAVA-4608] Optimize IdHoldingBsonWriter</title>
                <link>https://jira.mongodb.org/browse/JAVA-4608</link>
                <project id="10006" key="JAVA">Java Driver</project>
                    <description>&lt;p&gt;Microbenchmark of insert indicates that ~5% of time is spent in &lt;tt&gt;IdHoldingBsonWriter#getIdBsonWriter&lt;/tt&gt;&#160;.  An analysis of the code shows that in the normal case (when the document contains a simple _id value like an ObjectId), then it&apos;s not necessary to even call this method.  We should consider optimizing this class to remove unnecessary calls to this method.&lt;/p&gt;

&lt;p&gt;The main issue with the method appears to be the creation of a BasicOutputBuffer, which in turns creates a 1K byte array.  We generally pool large buffers like this, but this is a case where the pool is not used.  So a couple of other options would be to use a pooled buffer here, or dramatically shrink its size by using the constructor which allows it to be specified.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2044187">JAVA-4608</key>
            <summary>Optimize IdHoldingBsonWriter</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="13201">Fixed</resolution>
                                        <assignee username="jeff.yemin@mongodb.com">Jeffrey Yemin</assignee>
                                    <reporter username="jeff.yemin@mongodb.com">Jeffrey Yemin</reporter>
                        <labels>
                    </labels>
                <created>Wed, 11 May 2022 00:53:56 +0000</created>
                <updated>Sat, 28 Oct 2023 11:20:43 +0000</updated>
                            <resolved>Sat, 21 May 2022 18:26:19 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4564348" author="xgen-internal-githook" created="Sat, 21 May 2022 18:26:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jeff Yemin&apos;, &apos;email&apos;: &apos;jeff.yemin@mongodb.com&apos;, &apos;username&apos;: &apos;jyemin&apos;}
&lt;p&gt;Message: Remove unnecessary buffer allocation in IdHoldingBsonWriter (#947)&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/JAVA-4608&quot; title=&quot;Optimize IdHoldingBsonWriter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;JAVA-4608&quot;&gt;&lt;del&gt;JAVA-4608&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-java-driver/commit/3485793ece0b79a76bea55a28baef7ae7fded559&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-java-driver/commit/3485793ece0b79a76bea55a28baef7ae7fded559&lt;/a&gt;&lt;/p&gt;</comment>
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