Hi Thanh Do, SequenceFile.Writer.syncFs() in 2.x and 2.x-based releases, is deprecated in favor of hsync() and hflush() new methods but internally calls hflush itself, so its behavior is the same with regards to durability as it was before (new metadata entries are created and the buffer is flushed).
HBase has mechanisms to detect the right method to call (via reflection) - see the SequenceFileLogWriter#getHFlush(…) method for example. On Thu, Nov 1, 2012 at 11:09 PM, Thanh Do <[email protected]> wrote: > Hi all, > > Could somebody clarify me the behavior of SequenceFile.syncFs(). From the > source, I saw this function is deprecated, and hsync() or hflush() is > recommended? However, it seems like current stable release of HBase (0.94) > or the cloudera distribution (4.0) uses syncFs for its HLog file. > > Would syncFs() guarantee data durability? > > I am using hadoop 2.0. > > Many thanks, > Thanh Do > -- Harsh J
