Yes, explicitly invoking reAlloc() on vectors is not generally needed even though it is provided as a public API. If the value capacity is not known upfront or grows dynamically then setSafe() methods will take care of internally expanding the buffer to store more data -- here we don't have any fine grained control over the new size as we always double the buffer.
On Fri, Feb 23, 2018 at 4:49 PM, Atul Dambalkar <atul.dambal...@xoriant.com> wrote: > Thanks Sidd. Actually, I was looking at the code in base classes for > Vector implementation, and it does take care of reallocation itself (which > I was thinking of doing explicitly in the code). Although it uses "reAlloc" > which allocates double the current size, for me it works - as I plan to > start with moderate initial capacity for the vectors. > > -Atul > > -----Original Message----- > From: Siddharth Teotia [mailto:siddha...@dremio.com] > Sent: Friday, February 23, 2018 12:14 PM > To: dev@arrow.apache.org > Subject: Re: Allocating additional memory to the Java Vector objects > > Hi Atul, > > Currently there is no way for doing this. The only exposed method of > expanding the vector buffer is reAlloc() and it allocates a new buffer of > double the original capacity and copies the old contents into the new > buffer. > > Thanks, > Sidd > > On Fri, Feb 23, 2018 at 12:06 PM, Atul Dambalkar < > atul.dambal...@xoriant.com > > wrote: > > > Hi, > > > > I am creating IntVector in Java as follows - IntVector intVector = > > (IntVector) vectorSchemaRoot.getVector(name); > > intVector.setInitialCapacity(100); > > intVector.allocateNew(); > > > > Is there a way that I can allocate additional capacity to the same > > IntVector object by a defined number? Let's say something like - > > intVector.allocateAdditional(100), which would only add more capacity > > to the existing buffer without impacting the existing buffer and data. > > > > There is an API intVector.reAlloc, but it simply doubles the current > > allocated memory and not what I intend. > > > > Thanks for your inputs, > > -Atul > > > > >
