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https://issues.apache.org/jira/browse/HDFS-15696?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

lujie updated HDFS-15696:
-------------------------
    Description: 
getBlockFile can return null at 

https://github.com/apache/hadoop/blob/2ce2198287c9acade501d2681475fac1e5c27c68/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.java#L346

 

all its callers have null checker except at 

https://github.com/apache/hadoop/blob/2ce2198287c9acade501d2681475fac1e5c27c68/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/LocalReplica.java#L399

We shoud add null check for pontential NPE

  was:
peek can return null at 

[https://github.com/apache/hbase/blob/1726160839368df14602da1618e3538955b25f74/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/KeyValueHeap.java#L108]

 

all its callers have null checker except at 

[https://github.com/apache/hbase/blob/1726160839368df14602da1618e3538955b25f74/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/ReversedKeyValueHeap.java#L110]

We shoud add null check for pontential NPE


> One pontential NPE
> ------------------
>
>                 Key: HDFS-15696
>                 URL: https://issues.apache.org/jira/browse/HDFS-15696
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: lujie
>            Priority: Major
>
> getBlockFile can return null at 
> https://github.com/apache/hadoop/blob/2ce2198287c9acade501d2681475fac1e5c27c68/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.java#L346
>  
> all its callers have null checker except at 
> https://github.com/apache/hadoop/blob/2ce2198287c9acade501d2681475fac1e5c27c68/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/LocalReplica.java#L399
> We shoud add null check for pontential NPE



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