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https://issues.apache.org/jira/browse/HDFS-15264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17098195#comment-17098195
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Lisheng Sun commented on HDFS-15264:
------------------------------------
The findbugs should be not related to this patch.
[~ayushtkn] Could you help confirm fingbugs warnings that is related to this
patch?
{code:java}
Code Warning
WMI org.apache.hadoop.hdfs.server.protocol.SlowDiskReports.equals(Object)
makes inefficient use of keySet iterator instead of entrySet iterator
Bug type WMI_WRONG_MAP_ITERATOR (click for details)
In class org.apache.hadoop.hdfs.server.protocol.SlowDiskReports
In method org.apache.hadoop.hdfs.server.protocol.SlowDiskReports.equals(Object)
Field org.apache.hadoop.hdfs.server.protocol.SlowDiskReports.slowDisks
At SlowDiskReports.java:[line 105]
Bad practice Warnings
Code Warning
ME
org.apache.hadoop.hdfs.server.common.HdfsServerConstants$StartupOption.setClusterId(String)
unconditionally sets the field clusterId
ME
org.apache.hadoop.hdfs.server.common.HdfsServerConstants$StartupOption.setForce(int)
unconditionally sets the field force
ME
org.apache.hadoop.hdfs.server.common.HdfsServerConstants$StartupOption.setForceFormat(boolean)
unconditionally sets the field isForceFormat
ME
org.apache.hadoop.hdfs.server.common.HdfsServerConstants$StartupOption.setInteractiveFormat(boolean)
unconditionally sets the field isInteractiveFormat
Dodgy code Warnings
Code Warning
NP Possible null pointer dereference in
org.apache.hadoop.hdfs.qjournal.server.JournalNode.getJournalsStatus() due to
return value of called method
NP Possible null pointer dereference in
org.apache.hadoop.hdfs.server.datanode.DataStorage.linkBlocksHelper(File, File,
int, HardLink, boolean, File, List) due to return value of called method
NP Possible null pointer dereference in
org.apache.hadoop.hdfs.server.namenode.NNStorageRetentionManager.purgeOldLegacyOIVImages(String,
long) due to return value of called method
NP Possible null pointer dereference in
org.apache.hadoop.hdfs.server.namenode.NNUpgradeUtil$1.visitFile(Path,
BasicFileAttributes) due to return value of called method
UC Useless condition: it's known that argv.length >= 1 at this point
UC Useless condition: it's known that numBlocks == -1 at this point
{code}
1. Backport the patch to branch-3.1 as same to the tranch, that is not
unchanged.
2.There are a few small changes when backport the patch to branch-2.10.
a.
{code:java}
/**
* Add datanode to suspectNodes and suspectAndDeadNodes.
*/
public synchronized void addNodeToDetect(DFSInputStream dfsInputStream,
...
{color:red}suspectAndDeadNodes.put(dfsInputStream, datanodeInfos);{color}
...
}
{code}
Map#putIfAbsent in DeadNodeDetector#addNodeToDetectis changed to Map#put.
Since Map#putIfAbsent is supported from jdk 1.8, branch-2.10 is complied in
jdk7.
b. It chages Lamda to normal method in
TestDeadNodeDetection#startWaitForDeadNodeThread.
> Backport HDFS-13571,HDFS-15149 to branch-3.1, branch-2.10
> ---------------------------------------------------------
>
> Key: HDFS-15264
> URL: https://issues.apache.org/jira/browse/HDFS-15264
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Lisheng Sun
> Assignee: Lisheng Sun
> Priority: Major
> Attachments: HDFS-15264-branch-2.10.001.patch,
> HDFS-15264-branch-2.10.002.patch, HDFS-15264-branch-2.10.003.patch,
> HDFS-15264-branch-2.10.004.patch, HDFS-15264-branch-2.10.005.patch,
> HDFS-15264-branch-3.1.001.patch, HDFS-15264-branch-3.1.002.patch,
> HDFS-15264-branch-3.1.003.patch, HDFS-15264-branch-3.1.004.patch,
> HDFS-15264.001.patch
>
>
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