分页查询totalCount过大造成OOM

[xiejinsong]

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.ArrayList.(ArrayList.java:153)
at com.ejlchina.searcher.SearchResult.(SearchResult.java:32)
at com.ejlchina.searcher.implement.DefaultBeanSearcher.search(DefaultBeanSearcher.java:69)
at com.ejlchina.searcher.implement.DefaultBeanSearcher.search(DefaultBeanSearcher.java:32)

/**
 * Constructs an empty list with the specified initial capacity.
 *
 * @param  initialCapacity  the initial capacity of the list
 * @throws IllegalArgumentException if the specified initial capacity
 *         is negative
 */
public ArrayList(int initialCapacity) {
    if (initialCapacity > 0) {
        this.elementData = new Object[initialCapacity];
    } else if (initialCapacity == 0) {
        this.elementData = EMPTY_ELEMENTDATA;
    } else {
        throw new IllegalArgumentException("Illegal Capacity: "+
                                           initialCapacity);
    }
}

[troyzhxu]

totalCount 不会造成 OOM，每页查询条数太大才可能会。

[xiejinsong]

3.6版分页查询初始化SearchResult并没有初始化dataList长度，升级到3.8.1初始化SearchResult会初始化dataList长度大小为totalCount，ArrayList内部初始化数组会占用16 + totalCount * 4

SearchResult result = new SearchResult<>(totalCount, summaries);
BeanMeta beanMeta = searchSql.getBeanMeta();
SqlResult.ResultSet listResult = sqlResult.getListResult();

public SearchResult(Number totalCount, Number[] summaries) {
this(new ArrayList<>(totalCount.intValue()));
this.totalCount = totalCount;
this.summaries = summaries;
}

[troyzhxu]

多谢反馈，马上修复

[troyzhxu]

这是 v3.8.1 出现的 BUG, v3.8.2 已发布，修复了该问题。

[xiejinsong]

感谢，前段时间适配到aliyun ots多元索引，大大提升了开发效率。最近打算参考cube.js，将beansearcher做成olap引擎与前端的粘粘层。很棒～