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https://issues.apache.org/jira/browse/HDFS-17573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17869155#comment-17869155
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ASF GitHub Bot commented on HDFS-17573:
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Last-remote11 commented on code in PR #6929:
URL: https://github.com/apache/hadoop/pull/6929#discussion_r1694182265
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hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSImageWithSnapshot.java:
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@@ -23,10 +23,7 @@
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.SafeModeAction;
import org.apache.hadoop.fs.permission.FsPermission;
-import org.apache.hadoop.hdfs.DFSTestUtil;
-import org.apache.hadoop.hdfs.DFSUtil;
-import org.apache.hadoop.hdfs.DistributedFileSystem;
-import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.*;
Review Comment:
[remove wildcard
import](https://github.com/apache/hadoop/pull/6929/commits/0df56b2fdb6f0e7997565deb9038ef4ab0c33fb1)
Thank you for review
> Allow turn on both FSImage parallelization and compression
> ----------------------------------------------------------
>
> Key: HDFS-17573
> URL: https://issues.apache.org/jira/browse/HDFS-17573
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs, namenode
> Affects Versions: 3.4.1
> Reporter: Sungdong Kim
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.4.1, 3.5.0
>
> Attachments: compressed-image-load-serial.png,
> compressed-subsection-image-load-parallel.png,
> compressed-subsection-image-load-serial.png
>
>
> The feature added HDFS-14617(in Improve FSImage load time by writing
> sub-sections to the FSImage index. by [Stephen
> O'Donnell|https://issues.apache.org/jira/secure/ViewProfile.jspa?name=sodonnell])
> makes loading FSImage very faster.
>
> But this option cannot be activated when turn on dfs.image.compress=true.
> In my opinion, larger clusters require both settings at the same time.
> For Example, the cluster I'm using has approximately 6 million file system
> objects and FSImage is approximately 11GB with dfs.image.compress=true
> setting.
> If turn off the dfs.image.compress option, it is expected to exceed 30GB, in
> which case it will take a long time to move FSImage from standby to active
> namenode using high network resource.
>
> It was proved in this jira(HDFS-16147 by
> [kinit|https://issues.apache.org/jira/secure/ViewProfile.jspa?name=mofei])
> that loading FSImage parallel and FSImage compression can be turned on at the
> same time. (And worked well on my environment also.)
> I created this new Jira and PR because the discussion in HDFS-16147 ended in
> 2021, and I want it to be officially added in the next release, instead of
> patch available.
> The actual code of the patch was written by
> [kinit|https://issues.apache.org/jira/secure/ViewProfile.jspa?name=mofei] and
> I resolved empty sub-section problem(see below comment of HDFS-16147) and
> added test code.
> If this is not a proper method, please let me know another way to contribute.
> Thanks.
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