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Posted to issues@spark.apache.org by "Yang Jie (Jira)" <ji...@apache.org> on 2021/11/08 07:48:00 UTC
[jira] [Commented] (SPARK-37239) Avoid unnecessary `setReplication`
in Yarn mode
[ https://issues.apache.org/jira/browse/SPARK-37239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17440244#comment-17440244 ]
Yang Jie commented on SPARK-37239:
----------------------------------
Why `setReplication` is a unnecessary operation?
> 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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