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https://issues.apache.org/jira/browse/HBASE-18555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16123556#comment-16123556
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Xiang Li commented on HBASE-18555:
----------------------------------

Upload patch 001 to address [~chia7712]'s comment (Thanks very much) to update 
addxxx() functions of the follow classes
* sub-classes of Mutation
** Append
** Delete
** Increment
** Put
* sub-classes of Query
** Get
** Scan

> Remove redundant familyMap.put() from Put#addColumn() and addImmutable()
> ------------------------------------------------------------------------
>
>                 Key: HBASE-18555
>                 URL: https://issues.apache.org/jira/browse/HBASE-18555
>             Project: HBase
>          Issue Type: Improvement
>          Components: Client
>            Reporter: Xiang Li
>            Assignee: Xiang Li
>            Priority: Minor
>         Attachments: HBASE-18555.master.000.patch
>
>
> In Put#addColumn() and addImmutable(), after getting the cell list of the 
> given family and add the cell into the list, the code puts (key=family, 
> value=list) into familyMap.
> In addColumn(), it is like
> {code}
>     List<Cell> list = getCellList(family);
>     KeyValue kv = createPutKeyValue(family, qualifier, ts, value);
>     list.add(kv);
>     familyMap.put(CellUtil.cloneFamily(kv), list); // <-- here
>     return this;
> {code}
> In addImmutable(), it is like
> {code}
>     List<Cell> list = getCellList(family);
>     KeyValue kv = createPutKeyValue(family, qualifier, ts, value, tag);
>     list.add(kv);
>     familyMap.put(family, list); // <-- here
>     return this;
> {code}
> I think those put() for Map only take effect when getCellList(family) returns 
> a new allocated ArrayList. When the list for a family already exist, put() 
> for Map will update the value to the reference of the list, but actually, the 
> reference of the list is not changed.
> Those put() do not do any harm in terms of the correctness when they are 
> here. But it could be removed to improve the performance. familyMap searches 
> for key and set the new value and return the old value. Those operation take 
> some time but actually are not needed. 
> The put() could be moved into Mutation#getCellList(family)



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