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<item>
            <title>[SERVER-18629] WiredTiger journal system syncs wrong directory</title>
                <link>https://jira.mongodb.org/browse/SERVER-18629</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While observing mongod behavior using strace and perf with dbpath (wt home) &quot;/mnt/db&quot; and journal (wt log) directory &quot;journal&quot; I noticed that it was calling fdatasync apparently unnecessarily on &quot;/mnt/db&quot; and never calling fdatasync on &quot;/mnt/db/journal&quot;.&lt;/p&gt;

&lt;p&gt;The reason is because __wt_log_open initializes log-&amp;gt;log_dir_fh by calling __wt_open(session, &quot;journal&quot;, ...), which expands the path to &quot;/mnt/db/journal&quot; before passing it to __open_directory. But __open_directory appears to expect the path to a file in the directory rather than the path of the directory, as it strips the final component of the path and opens &quot;/mnt/db&quot;. The result is that the wt log system calls fdatasync on &quot;/mnt/db&quot; and not on &quot;/mnt/db/journal&quot;.&lt;/p&gt;

&lt;p&gt;There are two consequences to this:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Performance - the unnecessary fdatasync calls on /mnt/db can get stuck behind a lengthy call to fdatasync on a .wt file, or otherwise be hampered by i/o to .wt files; whereas an fdatsync call to /mnt/db/journal should be unimpeded by any activity in /mnt/db if the /mnt/db/journal has been placed on a separate drive, per our recommended best practices.&lt;/li&gt;
	&lt;li&gt;Durability - I believe durability of journaled writes depends on the fdatasync of /mnt/db/journal, in order to ensure that newly created journal files are durable.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="205976">SERVER-18629</key>
            <summary>WiredTiger journal system syncs wrong directory</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="-1">Unassigned</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>FT</label>
                    </labels>
                <created>Fri, 22 May 2015 11:32:22 +0000</created>
                <updated>Fri, 19 Jun 2015 21:42:28 +0000</updated>
                            <resolved>Tue, 26 May 2015 07:09:07 +0000</resolved>
                                    <version>3.0.3</version>
                                    <fixVersion>3.0.4</fixVersion>
                    <fixVersion>3.1.4</fixVersion>
                                    <component>WiredTiger</component>
                                        <votes>1</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="923478" author="ramon.fernandez" created="Tue, 26 May 2015 15:59:04 +0000"  >&lt;p&gt;Resolved in  &lt;a href=&quot;https://jira.mongodb.org/browse/WT-1941&quot; title=&quot;Sync the journal directory, not its parent&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-1941&quot;&gt;&lt;del&gt;WT-1941&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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