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https://issues.apache.org/jira/browse/HDFS-16709?focusedWorklogId=797067&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-797067
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ASF GitHub Bot logged work on HDFS-16709:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 02/Aug/22 00:40
Start Date: 02/Aug/22 00:40
Worklog Time Spent: 10m
Work Description: slfan1989 commented on PR #4667:
URL: https://github.com/apache/hadoop/pull/4667#issuecomment-1201877435
@ZanderXu
> I think we need it. Because after removing it, the IDEA warns _Unchecked
cast:`org.apache.hadoop.hdfs.server.namenode.FSEditLogOp` to T._
Thanks for the explanation, I have understood your changes.
LGTM.
Issue Time Tracking
-------------------
Worklog Id: (was: 797067)
Time Spent: 50m (was: 40m)
> Remove redundant cast in FSEditLogOp.class
> ------------------------------------------
>
> Key: HDFS-16709
> URL: https://issues.apache.org/jira/browse/HDFS-16709
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: ZanderXu
> Assignee: ZanderXu
> Priority: Major
> Labels: pull-request-available
> Time Spent: 50m
> Remaining Estimate: 0h
>
> When I read some class about Edits of NameNode, I found that there are much
> redundant cast in FSEditLogOp.class, I feel that we should remove them.
> Such as:
> {code:java}
> static UpdateBlocksOp getInstance(OpInstanceCache cache) {
> return (UpdateBlocksOp)cache.get(OP_UPDATE_BLOCKS);
> } {code}
> Because cache.get() have cast the response to T, such as:
> {code:java}
> @SuppressWarnings("unchecked")
> public <T extends FSEditLogOp> T get(FSEditLogOpCodes opCode) {
> return useCache ? (T)CACHE.get().get(opCode) : (T)newInstance(opCode);
> } {code}
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