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    <title>Magnolia - Issue tracker</title>
    <link>https://jira.magnolia-cms.com</link>
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    <language>en-uk</language>    <build-info>
        <version>9.4.2</version>
        <build-number>940002</build-number>
        <build-date>19-01-2023</build-date>
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            <title>[MAGNOLIA-6867] AsyncCommandLockingTest: Improve/investigate testing of concurrent access cases</title>
                <link>https://jira.magnolia-cms.com/browse/MAGNOLIA-6867</link>
                <project id="10000" key="MAGNOLIA">Magnolia</project>
                    <description>&lt;p&gt;Test in question is &lt;tt&gt;AsyncCommandLockingTest#throwsExceptionIfCommandsAreOperatingOnSameNode&lt;/tt&gt; - it has failed once on Jenkins (during some hard times for Jenkins in general) and at some point was failing consistently on my machine. &lt;/p&gt;

&lt;p&gt;The cure was to change the timing: increase the delay before the second command will try to lock the same node as another already running one. &lt;/p&gt;

&lt;p&gt;I did not investigate too much, but the situation looks rather suspicious to me: there was a case when &lt;tt&gt;both &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.magnolia-cms.com/images/icons/emoticons/warning.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/tt&gt; commands would fail with lock exceptions but with rather orthogonal messages:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;the command that starts later reports that _*Node /rootFolder is already locked&quot; (this is a normal and expected outcome, since the other command was supposed to actually lock that node first).&lt;/li&gt;
	&lt;li&gt;the first command however, can fail with also a lock exception claiming that &quot;Node /rootFolder is not locked&quot;. This made me puzzled - it looked as if the unsuccessful attempt of some other thread to clinch a lock has spoilt the lock state for the other thread.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Since this is about concurrency - in reality it might be completely different (and logically explainable) but still would be nice to address this and find out what was the reason for such odd test behaviour.&lt;/p&gt;

&lt;p&gt;The fundamental problem with the commands was that one command may try to obtain lock and succeed but the other one would fail but both of them would try to unlock the node therefore we would have different exception messages. Only one command should be obtaining the lock (no problem with that part) and hence responsible for unlocking as well.&lt;/p&gt;</description>
                <environment></environment>
        <key id="55943">MAGNOLIA-6867</key>
            <summary>AsyncCommandLockingTest: Improve/investigate testing of concurrent access cases</summary>
                <type id="3" iconUrl="https://jira.magnolia-cms.com/secure/viewavatar?size=xsmall&amp;avatarId=10898&amp;avatarType=issuetype">Task</type>
                                            <priority id="6" iconUrl="https://jira.magnolia-cms.com/images/icons/priorities/neutral.gif">Neutral</priority>
                        <status id="6" iconUrl="https://jira.magnolia-cms.com/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are not closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="1">Fixed</resolution>
                                        <assignee username="ilgun">Ilgun Ilgun</assignee>
                                    <reporter username="apchelintcev">Aleksandr Pchelintcev</reporter>
                        <labels>
                    </labels>
                <created>Thu, 10 Nov 2016 09:40:01 +0100</created>
                <updated>Tue, 22 Nov 2016 16:35:32 +0100</updated>
                            <resolved>Tue, 22 Nov 2016 09:10:51 +0100</resolved>
                                    <version>5.5</version>
                                    <fixVersion>5.5.1</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
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