Roshan Naik 2013-05-31, 21:53
Hari Shreedharan 2013-05-31, 22:16
Roshan Naik 2013-05-31, 22:51
-Re: File Channel issue - recovering from BadCheckpoint exception
Hari Shreedharan 2013-05-31, 22:57
No, that would break all config files from Flume 1.3.0 and Flume 1.3.1. We should probably have some code that specifically disables this on Windows and clearly document that.
On Friday, May 31, 2013 at 3:51 PM, Roshan Naik wrote:
> Would it make sense for default config setting for the auto-deletion to be
> set to 'false' then ?
> On Fri, May 31, 2013 at 3:16 PM, Hari Shreedharan <[EMAIL PROTECTED] (mailto:[EMAIL PROTECTED])
> > wrote:
> > For now, how about making the auto-deletion configurable? If it is
> > configured not to delete, then don't even try to startup the channel. This
> > will bring in the pre-1.3.0 behavior where the channel's recovery is
> > manual? I suspect you are going to hit many more issues when you enable
> > dual checkpoints - and fixing that is going to be non-trivial.
> > Cheers,
> > Hari
> > On Friday, May 31, 2013 at 2:53 PM, Roshan Naik wrote:
> > > In EventQueueBackingStoreFileV3 constructor, if it detects that the
> > > checkpoint and meta files have differing logWriteOrderIds, it throws a
> > > BadCheckpointException. Controls goes back to the exception handler in
> > > Log.replay() which attempts to delete all the files in checkpoint
> > >
> > directory
> > > and start fresh. The same file names are reused when starting fresh.
> > >
> > > Unfortunately this does not work on Windows since the deletion of
> > > the checkpoint file in the checkpointDir fails. The failure is due to the
> > > fact that the checkpoint file is memory mapped. Unless it is unmapped the
> > > deletion will not succeed... and unfortunately Java does not have unmap
> > > support. Windows does not permit deletion (or renaming) of files in use.
> > >
> > > The obvious thought i am having is that when starting fresh we delete
> > > whatever we can and invent a new file name for the ones we cant (i think
> > > for checkpoint file only)
> > >
> > > thoughts ?
> > >
> > > -roshan
Roshan Naik 2013-05-31, 23:01
Hari Shreedharan 2013-05-31, 23:15
Brock Noland 2013-06-01, 02:08