Limit clause in SQL Select statement makes sense because it allows query optimizer to plan accordingly. It does not make sense in HBase as since there is no query planner and or optimization involved during scanning HBase table. You can easily mimic this functionality on a client side (I mean - limit).
Best regards, Vladimir Rodionov Principal Platform Engineer Carrier IQ, www.carrieriq.com e-mail: [email protected] ________________________________________ From: Weiping Qu [[email protected]] Sent: Monday, March 17, 2014 4:48 AM To: [email protected] Subject: Re: 答复: setMaxResultSize method in Scan Thanks. I'd like to assume that setMaxResultSize is equivalent to the SQL Limit clause as expected which is specified each time a SQL statement is executed . Now through "hbase.client.scanner.max.result.size" can the limitation of number of row returned only apply to all the scanner instances. I am wondering why the setMaxResultSize is removed now. > No such method for Scan in 0.94.x. > > If you want to set the max result size for a scan, you can achieve this by > setting the "hbase.client.scanner.max.result.size" configuration, the default > for which is Long.MAX_VALUE (no limited) > ________________________________________ > 发件人: Weiping Qu [[email protected]] > 发送时间: 2014年3月17日 18:50 > 收件人: [email protected] > 主题: setMaxResultSize method in Scan > > Hello, > > I could not find the method setMaxResultSize(long m) > (http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/client/Scan.html) > in my Scanclass (0.94.13 version). > Can anyone help me? Thanks > > Weiping -- Mit freundlichen Grü?en / Kind Regards *Weiping Qu* University of Kaiserslautern Department of Computer Science Heterogeneous Information Systems Group P.O. Box 3049 67653 Kaiserslautern, Germany Email: qu (at) informatik.uni-kl.de Phone: +49 631 205 3264 Fax: +49 631 205 3299 Room: 36/331 Confidentiality Notice: The information contained in this message, including any attachments hereto, may be confidential and is intended to be read only by the individual or entity to whom this message is addressed. If the reader of this message is not the intended recipient or an agent or designee of the intended recipient, please note that any review, use, disclosure or distribution of this message or its attachments, in any form, is strictly prohibited. If you have received this message in error, please immediately notify the sender and/or [email protected] and delete or destroy any copy of this message and its attachments.
