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https://issues.apache.org/jira/browse/SPARK-37239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17440329#comment-17440329
]
wang-zhun commented on SPARK-37239:
-----------------------------------
[~LuciferYang] Yes, use the default value
{code:java}
org.apache.spark.deploy.yarn.Client
```
val replication = sparkConf.get(STAGING_FILE_REPLICATION).map(_.toShort)
.getOrElse(fs.getDefaultReplication(destDir))
FileUtil.copy(srcFs, srcPath, destFs, destPath, false, hadoopConf)
destFs.setReplication(destPath, replication)
```
replication: Short -> replication: Option[Short]
```
val replication = sparkConf.get(STAGING_FILE_REPLICATION).map(_.toShort)
FileUtil.copy(srcFs, srcPath, destFs, destPath, false, hadoopConf)
replication.map(destFs.setReplication(destPath, _))
```{code}
> Avoid unnecessary `setReplication` in Yarn mode
> -----------------------------------------------
>
> Key: SPARK-37239
> URL: https://issues.apache.org/jira/browse/SPARK-37239
> Project: Spark
> Issue Type: Improvement
> Components: YARN
> Affects Versions: 3.1.2
> Reporter: wang-zhun
> Priority: Major
>
> We found a large number of replication logs in hdfs server
> ```
> 2021-11-04,17:22:13,065 INFO
> org.apache.hadoop.hdfs.server.namenode.FSDirectory: Replication remains
> unchanged at 3 for
> xxx/.sparkStaging/application_1635470728320_1144379/__spark_libs__303253482044663796.zip
> 2021-11-04,17:22:13,069 INFO
> org.apache.hadoop.hdfs.server.namenode.FSDirectory: Replication remains
> unchanged at 3 for
> xxx/.sparkStaging/application_1635470728320_1144383/__spark_libs__4747402134564993861.zip
> 2021-11-04,17:22:13,070 INFO
> org.apache.hadoop.hdfs.server.namenode.FSDirectory: Replication remains
> unchanged at 3 for
> xxx/.sparkStaging/application_1635470728320_1144373/__spark_libs__4377509773730188331.zip
> ```
> https://github.com/apache/hadoop/blob/6f7b965808f71f44e2617c50d366a6375fdfbbfa/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java#L2439
>
> `setReplication` needs to acquire write lock, we should reduce this
> unnecessary operation
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