What exception would I expect to get if this limit was exceeded? john From: Harsh J [mailto:[email protected]] Sent: Monday, January 27, 2014 8:12 AM To: <[email protected]> Subject: Re: HDFS open file limit
Hi John, There is a concurrent connections limit on the DNs that's set to a default of 4k max parallel threaded connections for reading or writing blocks. This is also expandable via configuration but usually the default value suffices even for pretty large operations given the replicas help spread read load around. Beyond this you will mostly just run into configurable OS limitations. On Jan 26, 2014 11:03 PM, "John Lilley" <[email protected]<mailto:[email protected]>> wrote: I have an application that wants to open a large set of files in HDFS simultaneously. Are there hard or practical limits to what can be opened at once by a single process? By the entire cluster in aggregate? Thanks John
