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    <title>Mojang Studios Jira</title>
    <link>https://bugs.mojang.com</link>
    <description>This file is an XML representation of an issue</description>
    <language>en</language>    <build-info>
        <version>9.12.2</version>
        <build-number>9120002</build-number>
        <build-date>10-01-2024</build-date>
    </build-info>


<item>
            <title>[MCPE-13417] Item travel very slow when using hoppers.</title>
                <link>https://bugs.mojang.com/browse/MCPE-13417</link>
                <project id="10200" key="MCPE">Minecraft (Bedrock codebase)</project>
                    <description>&lt;p&gt;Hoppers don&apos;t spit out items instantly. Instead they wait until they are completely filled up and then spit out items. For example, if I put a stack of diamonds in the hopper the other hopper that the diamonds will travel to won&apos;t spit out the diamonds instantly. It takes a very long time for the items to travel long distances and I hope you guys can fix it in 0.14.1 or something. Thank you for your time! &lt;img class=&quot;emoticon&quot; src=&quot;https://bugs.mojang.com/images/icons/emoticons/biggrin.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</description>
            <key id="134044">MCPE-13417</key>
            <summary>Item travel very slow when using hoppers.</summary>
                <type id="1" iconUrl="https://bugs.mojang.com/secure/viewavatar?size=xsmall&amp;avatarId=18903&amp;avatarType=issuetype">Bug</type>
                                    <status id="5" iconUrl="https://bugs.mojang.com/images/icons/statuses/resolved.png" description="A resolution has been taken, and it is awaiting verification by reporter. From here issues are either reopened, or are closed.">Resolved</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="1">Fixed</resolution>
                                            <reporter username="Xx_Sam_xX">Sam Hernandez</reporter>
                        <labels>
                            <label>hopper</label>
                    </labels>
                <created>Fri, 12 Feb 2016 04:07:52 +0100</created>
                <updated>Wed, 10 May 2017 11:09:43 +0200</updated>
                            <resolved>Thu, 28 Apr 2016 17:11:45 +0200</resolved>
                                    <version>0.14.0</version>
                    <version>0.14.0 Beta 6</version>
                                    <fixVersion>0.14.2</fixVersion>
                                                        <votes>4</votes>
                                    <watches>4</watches>
                                                                            <comments>
                            <comment id="302015" author="depressed-pho" created="Thu, 28 Apr 2016 17:11:45 +0200"  >&lt;p&gt;This particular issue has been fixed in 0.14.1 but fixing it incurred a different problem, namely &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-14075&quot; title=&quot;Strange nondeterminism in horizontal hopper pipes and their cooldown counter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MCPE-14075&quot;&gt;&lt;del&gt;MCPE-14075&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="298949" author="depressed-pho" created="Thu, 7 Apr 2016 14:26:55 +0200"  >&lt;p&gt;Fixed in 0.14.1. Thanks!&lt;/p&gt;</comment>
                            <comment id="295130" author="kalul" created="Thu, 17 Mar 2016 08:05:34 +0100"  >&lt;p&gt;Same here. i made a lot with hoppers the last days. (timers,sorting machines etc.) i can confirm it is fast downways and slow sideways.&lt;/p&gt;</comment>
                            <comment id="287699" author="depressed-pho" created="Fri, 19 Feb 2016 14:07:02 +0100"  >&lt;p&gt;I investigated this further. The glitch doesn&apos;t occur when the hoppers are cascaded vertically. And for horizontal hopper pipes, the glitch sometimes occurs and sometimes not. More specifically, a perfectly working horizontal pipe may stop working after reloading the world, and if you reload it again the pipe may start working correctly. So,&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;The bug is in the &quot;push&quot; action of hoppers. Not in the &quot;pull&quot;.&lt;/li&gt;
	&lt;li&gt;The bug depends on the order of hoppers being processed in the same tick.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&lt;b&gt;Steps to reproduce:&lt;/b&gt;&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Build a structure shown in my screenshot &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://bugs.mojang.com/secure/attachment/111548/111548_hopper-pipe-glitch.jpg&quot; title=&quot;hopper-pipe-glitch.jpg attached to MCPE-13417&quot;&gt;hopper-pipe-glitch.jpg&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://bugs.mojang.com/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;/li&gt;
	&lt;li&gt;Put a stack of items into the chest &#945;.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;&lt;b&gt;What actually happens:&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;There should be a moment where all of the three comparators are activated, but sometimes that doesn&apos;t happen.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;My hypothesis is as follows (TL;DR):&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;Suppose we had 2 items X and Y in the chest &#945;, and hopper A were to be processed first, then B, then C.&lt;br/&gt;
At the game tick t = 0,&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Hopper A checks its cooldown counter and finds it&apos;s 0.&lt;/li&gt;
	&lt;li&gt;Hopper A attempts to push an item inside it to hopper B, but fails since it has no items.&lt;/li&gt;
	&lt;li&gt;Hopper A attempts to pull an item from chest &#945;, namely the item X. This succeeds so the cooldown counter of hopper A becomes 8.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;At t = 1,&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Hopper A subtracts 1 from its counter. The counter becomes 7.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;At t = 8,&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Hopper A subtracts 1 from its counter. The counter becomes 0.&lt;/li&gt;
	&lt;li&gt;Hopper A pushes the item X to hopper B, and resets the counter of both A and B to 8.&lt;/li&gt;
	&lt;li&gt;Hopper A pulls the item Y from chest &#945;, and resets its own counter to 8. (This is actually a no-op though.)&lt;/li&gt;
	&lt;li&gt;&lt;b&gt;At this time, hopper B is supposed to check its counter and subtract 1 from it. But in reality it doesn&apos;t, which is the cause of glitch.&lt;/b&gt;&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;At t = 9,&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;The counter of hopper A becomes 7.&lt;/li&gt;
	&lt;li&gt;The counter of hopper B also becomes 7 while it&apos;s supposed to be 6 now.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;At t = 15,&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;The counter of hopper A becomes 1.&lt;/li&gt;
	&lt;li&gt;The counter of hopper B becomes 1, while it&apos;s supposed to be 0 now. So it should push the item X to hopper C but actually it doesn&apos;t.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;At t = 16,&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;The counter of hopper A becomes 0.&lt;/li&gt;
	&lt;li&gt;Hopper A pushes the item Y to hopper B, and resets the counter of both A and B to 8. &lt;b&gt;Yes, hopper B is suspended again before getting a chance to push the item X. Now hopper B has two items X and Y, which shouldn&apos;t happen.&lt;/b&gt;&lt;/li&gt;
	&lt;li&gt;Hopper A attempts to pull an item from chest &#945;, but fails since the chest is now empty.&lt;/li&gt;
	&lt;li&gt;At this time hopper B is supposed to decrease its counter but it doesn&apos;t. The counter remains to be 8.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;At t = 24,&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;The counter of hopper A becomes 0, but it has nothing to do now.&lt;/li&gt;
	&lt;li&gt;The counter of hopper B becomes 0.&lt;/li&gt;
	&lt;li&gt;Hopper B pushes the item X to hopper C, and resets the counter of both B and C to 8.&lt;/li&gt;
	&lt;li&gt;Hopper C should decrease its counter but again, it doesn&apos;t.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;At t = 32,&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Hopper B pushes the item Y to hopper C, and resets the counter of both B and C to 8. Now hopper C has two items X and Y.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;At t = 40,&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Hopper C pushes the item X to chest &#946;.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;At t = 48,&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Hopper C pushes the item Y to chest &#946;.&lt;/li&gt;
&lt;/ol&gt;
</comment>
                            <comment id="287230" author="depressed-pho" created="Thu, 18 Feb 2016 15:55:15 +0100"  >&lt;p&gt;Confirmed in 0.14.0 alpha.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="134441">MCPE-13559</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="134656">MCPE-13591</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="137647">MCPE-13946</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10103">
                    <name>Relates</name>
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                                        <issuelink>
            <issuekey id="139094">MCPE-14075</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="111548" name="hopper-pipe-glitch.jpg" size="232705" author="depressed-pho" created="Fri, 19 Feb 2016 14:07:02 +0100"/>
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