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https://issues.apache.org/jira/browse/HBASE-18986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16200249#comment-16200249
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Hadoop QA commented on HBASE-18986:
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| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  
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|| Subsystem || Report/Notes ||
| JIRA Issue | HBASE-18986 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12891470/HBASE-18986.master.000.patch
 |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/9042/console |
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> Remove unnecessary null check after CellUtil.cloneQualifier()
> -------------------------------------------------------------
>
>                 Key: HBASE-18986
>                 URL: https://issues.apache.org/jira/browse/HBASE-18986
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Xiang Li
>            Assignee: Xiang Li
>            Priority: Minor
>         Attachments: HBASE-18986.master.000.patch
>
>
> In master branch,
> {code:title=hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java|borderStyle=solid}
> // From line 2858
> public void prepareDeleteTimestamps(Mutation mutation, Map<byte[], 
> List<Cell>> familyMap,
>       byte[] byteNow) throws IOException {
>     for (Map.Entry<byte[], List<Cell>> e : familyMap.entrySet()) {
>       // ...
>       for (int i=0; i < listSize; i++) {
>         // ...
>         if (cell.getTimestamp() == HConstants.LATEST_TIMESTAMP && 
> CellUtil.isDeleteType(cell)) {
>           byte[] qual = CellUtil.cloneQualifier(cell);
>           if (qual == null) qual = HConstants.EMPTY_BYTE_ARRAY; // <-- here
>           ...
> {code}
> Might {{if (qual == null) qual = HConstants.EMPTY_BYTE_ARRAY;}} be removed?
> Could it be null after CellUtil.cloneQualifier()?
> {code:title=hbase-common/src/main/java/org/apache/hadoop/hbase/CellUtil.java|borderStyle=solid}
> public static byte[] cloneQualifier(Cell cell){
>   byte[] output = new byte[cell.getQualifierLength()];
>   copyQualifierTo(cell, output, 0);
>   return output;
> }
> {code}



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