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    <title>Whamcloud Community JIRA</title>
    <link>https://jira.whamcloud.com</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
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        <build-number>940014</build-number>
        <build-date>05-12-2023</build-date>
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<item>
            <title>[LU-10699] replace HSM actions llog with an index</title>
                <link>https://jira.whamcloud.com/browse/LU-10699</link>
                <project id="10000" key="LU">Lustre</project>
                    <description></description>
                <environment></environment>
        <key id="50907">LU-10699</key>
            <summary>replace HSM actions llog with an index</summary>
                <type id="1" iconUrl="https://jira.whamcloud.com/secure/viewavatar?size=xsmall&amp;avatarId=11303&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.whamcloud.com/images/icons/priorities/minor.svg">Minor</priority>
                        <status id="5" iconUrl="https://jira.whamcloud.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="2">Won&apos;t Fix</resolution>
                                        <assignee username="jhammond">John Hammond</assignee>
                                    <reporter username="jhammond">John Hammond</reporter>
                        <labels>
                            <label>hsm</label>
                    </labels>
                <created>Thu, 22 Feb 2018 17:18:17 +0000</created>
                <updated>Thu, 23 Sep 2021 13:09:23 +0000</updated>
                            <resolved>Wed, 9 Jun 2021 13:38:51 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>9</watches>
                                                                            <comments>
                            <comment id="221480" author="gerrit" created="Thu, 22 Feb 2018 17:22:09 +0000"  >&lt;p&gt;John L. Hammond (john.hammond@intel.com) uploaded a new patch: &lt;a href=&quot;https://review.whamcloud.com/31382&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://review.whamcloud.com/31382&lt;/a&gt;&lt;br/&gt;
Subject: &lt;a href=&quot;https://jira.whamcloud.com/browse/LU-10699&quot; title=&quot;replace HSM actions llog with an index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;LU-10699&quot;&gt;&lt;del&gt;LU-10699&lt;/del&gt;&lt;/a&gt; hsm: remove struct hsm_compat_data_cb&lt;br/&gt;
Project: fs/lustre-release&lt;br/&gt;
Branch: master&lt;br/&gt;
Current Patch Set: 1&lt;br/&gt;
Commit: 51cb00be305d4c15253e647d7ac1bbf8a891de87&lt;/p&gt;</comment>
                            <comment id="221499" author="gerrit" created="Thu, 22 Feb 2018 18:33:01 +0000"  >&lt;p&gt;John L. Hammond (john.hammond@intel.com) uploaded a new patch: &lt;a href=&quot;https://review.whamcloud.com/31385&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://review.whamcloud.com/31385&lt;/a&gt;&lt;br/&gt;
Subject: &lt;a href=&quot;https://jira.whamcloud.com/browse/LU-10699&quot; title=&quot;replace HSM actions llog with an index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;LU-10699&quot;&gt;&lt;del&gt;LU-10699&lt;/del&gt;&lt;/a&gt; hsm: simplify mdt_hsm_&lt;/p&gt;
{add,get}
&lt;p&gt;_actions()&lt;br/&gt;
Project: fs/lustre-release&lt;br/&gt;
Branch: master&lt;br/&gt;
Current Patch Set: 1&lt;br/&gt;
Commit: 9f31bff9426f3f9c8b385a2a6bf577cce5ef63bf&lt;/p&gt;</comment>
                            <comment id="224429" author="gerrit" created="Fri, 23 Mar 2018 17:15:05 +0000"  >&lt;p&gt;John L. Hammond (john.hammond@intel.com) uploaded a new patch: &lt;a href=&quot;https://review.whamcloud.com/31758&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://review.whamcloud.com/31758&lt;/a&gt;&lt;br/&gt;
Subject: &lt;a href=&quot;https://jira.whamcloud.com/browse/LU-10699&quot; title=&quot;replace HSM actions llog with an index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;LU-10699&quot;&gt;&lt;del&gt;LU-10699&lt;/del&gt;&lt;/a&gt; hsm: add local object storage to MDTs&lt;br/&gt;
Project: fs/lustre-release&lt;br/&gt;
Branch: master&lt;br/&gt;
Current Patch Set: 1&lt;br/&gt;
Commit: bea8460d694ca3b2e120d70abdb98f2fddc71aeb&lt;/p&gt;</comment>
                            <comment id="224543" author="gerrit" created="Mon, 26 Mar 2018 16:11:13 +0000"  >&lt;p&gt;John L. Hammond (john.hammond@intel.com) uploaded a new patch: &lt;a href=&quot;https://review.whamcloud.com/31776&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://review.whamcloud.com/31776&lt;/a&gt;&lt;br/&gt;
Subject: &lt;a href=&quot;https://jira.whamcloud.com/browse/LU-10699&quot; title=&quot;replace HSM actions llog with an index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;LU-10699&quot;&gt;&lt;del&gt;LU-10699&lt;/del&gt;&lt;/a&gt; hsm: add HSM actions index&lt;br/&gt;
Project: fs/lustre-release&lt;br/&gt;
Branch: master&lt;br/&gt;
Current Patch Set: 1&lt;br/&gt;
Commit: e8a66c34148dc8e7cf898f957a319959ad79bebd&lt;/p&gt;</comment>
                            <comment id="224775" author="gerrit" created="Wed, 28 Mar 2018 21:30:59 +0000"  >&lt;p&gt;John L. Hammond (john.hammond@intel.com) uploaded a new patch: &lt;a href=&quot;https://review.whamcloud.com/31821&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://review.whamcloud.com/31821&lt;/a&gt;&lt;br/&gt;
Subject: &lt;a href=&quot;https://jira.whamcloud.com/browse/LU-10699&quot; title=&quot;replace HSM actions llog with an index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;LU-10699&quot;&gt;&lt;del&gt;LU-10699&lt;/del&gt;&lt;/a&gt; osd: add update methods to DT index API&lt;br/&gt;
Project: fs/lustre-release&lt;br/&gt;
Branch: master&lt;br/&gt;
Current Patch Set: 1&lt;br/&gt;
Commit: 805d782f9d62b8e454d087e73b8fbcbb990b76b2&lt;/p&gt;</comment>
                            <comment id="226326" author="gerrit" created="Thu, 19 Apr 2018 04:38:31 +0000"  >&lt;p&gt;Oleg Drokin (oleg.drokin@intel.com) merged in patch &lt;a href=&quot;https://review.whamcloud.com/31382/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://review.whamcloud.com/31382/&lt;/a&gt;&lt;br/&gt;
Subject: &lt;a href=&quot;https://jira.whamcloud.com/browse/LU-10699&quot; title=&quot;replace HSM actions llog with an index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;LU-10699&quot;&gt;&lt;del&gt;LU-10699&lt;/del&gt;&lt;/a&gt; hsm: remove struct hsm_compat_data_cb&lt;br/&gt;
Project: fs/lustre-release&lt;br/&gt;
Branch: master&lt;br/&gt;
Current Patch Set: &lt;br/&gt;
Commit: 9321c8a3de6fe26b30a6eeac423e0407a8b1c564&lt;/p&gt;</comment>
                            <comment id="227044" author="gerrit" created="Wed, 2 May 2018 02:23:31 +0000"  >&lt;p&gt;Oleg Drokin (oleg.drokin@intel.com) merged in patch &lt;a href=&quot;https://review.whamcloud.com/31385/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://review.whamcloud.com/31385/&lt;/a&gt;&lt;br/&gt;
Subject: &lt;a href=&quot;https://jira.whamcloud.com/browse/LU-10699&quot; title=&quot;replace HSM actions llog with an index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;LU-10699&quot;&gt;&lt;del&gt;LU-10699&lt;/del&gt;&lt;/a&gt; hsm: simplify mdt_hsm_&lt;/p&gt;
{add,get}
&lt;p&gt;_actions()&lt;br/&gt;
Project: fs/lustre-release&lt;br/&gt;
Branch: master&lt;br/&gt;
Current Patch Set: &lt;br/&gt;
Commit: 9bc0d837eb0cfc7e1d9ce702057761560d66434c&lt;/p&gt;</comment>
                            <comment id="228054" author="gerrit" created="Thu, 17 May 2018 02:30:58 +0000"  >&lt;p&gt;Oleg Drokin (oleg.drokin@intel.com) merged in patch &lt;a href=&quot;https://review.whamcloud.com/31758/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://review.whamcloud.com/31758/&lt;/a&gt;&lt;br/&gt;
Subject: &lt;a href=&quot;https://jira.whamcloud.com/browse/LU-10699&quot; title=&quot;replace HSM actions llog with an index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;LU-10699&quot;&gt;&lt;del&gt;LU-10699&lt;/del&gt;&lt;/a&gt; hsm: add local object storage to MDTs&lt;br/&gt;
Project: fs/lustre-release&lt;br/&gt;
Branch: master&lt;br/&gt;
Current Patch Set: &lt;br/&gt;
Commit: d8cd83addf0020b971c50f6928badf885590742c&lt;/p&gt;</comment>
                            <comment id="270978" author="nrutman" created="Sat, 23 May 2020 01:50:31 +0000"  >&lt;p&gt;Is this trying to address &lt;a href=&quot;https://jira.whamcloud.com/browse/LU-9540&quot; title=&quot;cache HSM actions in memory by FID&quot; class=&quot;issue-link&quot; data-issue-key=&quot;LU-9540&quot;&gt;LU-9540&lt;/a&gt;?&lt;/p&gt;</comment>
                            <comment id="271277" author="jhammond" created="Wed, 27 May 2020 13:13:16 +0000"  >&lt;p&gt;It&apos;s trying to address several things that are awkward or inefficient due to the use of a catalog for HSM actions. &lt;a href=&quot;https://jira.whamcloud.com/browse/LU-13543&quot; title=&quot;hsm.actions file is broken on RHEL 8.2&quot; class=&quot;issue-link&quot; data-issue-key=&quot;LU-13543&quot;&gt;&lt;del&gt;LU-13543&lt;/del&gt;&lt;/a&gt; is the most recent example.&lt;/p&gt;</comment>
                            <comment id="313771" author="degremoa" created="Thu, 23 Sep 2021 09:13:21 +0000"  >&lt;p&gt;@John Hammond , could you explained why this solution was abandoned? Is there a fundamental flaw in its design?&lt;/p&gt;</comment>
                            <comment id="313788" author="jhammond" created="Thu, 23 Sep 2021 12:53:00 +0000"  >&lt;p&gt;&amp;gt;  Is there a fundamental flaw in its design?&lt;/p&gt;

&lt;p&gt;No. An index is better suited than an llog for the access patterns we need to support here. (Just like a RB tree is better than a linked list when ...). But I cannot spend time on this now due to other responsibilities.&lt;/p&gt;

&lt;p&gt;Anyone who would like to pursue this should feel free to reopen the issue.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="49733">LU-10383</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="51509">LU-10850</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="51531">LU-10855</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="51530">LU-10854</issuekey>
        </issuelink>
                            </inwardlinks>
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