Re: NameNode sync using DUAL_ASYNC mode on IGFS

2017-04-05 Thread dkarachentsev
Hi, You may use it in cases when you use temporary files that should be removed after node stop, or any other data that don't require persistence. -Dmitry. -- View this message in context: http://apache-ignite-users.70518.x6.nabble.com/NameNode-sync-using-DUAL-ASYNC-mode-on-IGFS-tp11644p11756

Re: NameNode sync using DUAL_ASYNC mode on IGFS

2017-04-04 Thread Masayuki Takahashi
Hi Dmitriy, Thanks for explaining. I understand. In situations using Name node, it's better to use DUAL_SYNC mode. May I ask one more? > Basically it means that every time a data is changed in Ignite, it will also > be changed in the underlying HDFS, either synchronously or asynchronously, > b

Re: NameNode sync using DUAL_ASYNC mode on IGFS

2017-04-03 Thread Dmitriy Setrakyan
Hi Massayuki, Ignite itself does not have a concept of a NameNode. It goes directly to the cluster node responsible for storing the data based on a key's hashcode. The only time when a NameNode would come into a play, is when Hadoop HDFS is configured as an underlying write-through file system. B

NameNode sync using DUAL_ASYNC mode on IGFS

2017-04-02 Thread Masayuki Takahashi
Hi, I am trying to use IGFS on HDFS. If I set DUAL_ASYNC to IGFS mode and execute 'hdfs dfs -put ...', when does the file info write to HDFS NameNode? Also, if I set PRIMARY to IGFS mode and put a new file, does the file info write to HDFS NameNode? thanks. -- Masayuki Takahashi