Did it speed up your queries? As you can see from the followup discussions here, there is some general confusion around this.
Generally there are 2 sizes involved: 1. HBase Filesize 2. HBase Blocksize #1 sets the maximum size of a region before it is split. Default used to be 512mb, it's now 1g (but usually it should be even larger) #2 is the size of the blocks inside the HFiles. Smaller blocks mean better random access, but larger block indexes. I would only increase that if you have large cells. -- Lars ________________________________ From: Damien Hardy <[email protected]> To: [email protected] Sent: Monday, November 14, 2011 12:51 AM Subject: Re: Row get very slow Le 13/11/2011 16:13, Arvind Jayaprakash a écrit : > A common confusion is b/w MAX_FILESIZE and BLOCKSIZE. Given that > MAX_FILESIZE is not listed on :60010/master.jsp, one tends to assume > BLOCKSIZE represents that value. > > On Nov 10, lars hofhansl wrote: >> "BLOCKSIZE => '536870912'" >> >> >> You set your blocksize to 512mb? The default is 64k (65536), try to set it >> to something lower. Hello, Thank you for answer I have just altered my table and launched a major_compact to get it effective. I thought that increasing FILSIZE of HBases implies somehow changes on the BLOSKSIZE of my tables and to prevent unbalanced paramaters increased it too ... #FAIL. The question is : in what application BLOCKSIZE should be changed (increased or decreased) ? Thank you. -- Damien
