Yes, I'm glad to do it. but I'm not sure writing a new file is a good solution. So I want to discuss it here. Do you have any ideas? @Kostas
------------------ ???????? ------------------ ??????: "twalthr"<twal...@apache.org>; ????????: 2018??5??15??(??????) ????8:21 ??????: "Xinyu Zhang"<342689...@qq.com>; ????: "dev"<dev@flink.apache.org>; "kkloudas"<kklou...@apache.org>; ????: Re: ?????? Rewriting a new file instead of writing a ".valid-length" file inBucketSink when restoring As far as I know, the bucketing sink is currenlty also limited by relying on Hadoops file system abstraction. It is planned to switch to Flink's file system abstraction which might also improve this situation. Kostas (in CC) might know more about it. But I think we can discuss if an other behavior should be configurable as well. Would you be willing to contribute? Regards, Timo Am 15.05.18 um 14:01 schrieb Xinyu Zhang: > Thanks for your reply. > Indeed, if a file is very large, it will take a long time. However, > the the ??.valid-length?? file is not convenient for others who use the > data in HDFS. > Maybe we should provide a configuration for users to choose which > strategy they prefer. > Do you have any ideas? > > > ------------------ ???????? ------------------ > *??????:* "Timo Walther"<twal...@apache.org>; > *????????:* 2018??5??15??(??????) ????7:30 > *??????:* "dev"<dev@flink.apache.org>; > *????:* Re: Rewriting a new file instead of writing a ".valid-length" > file inBucketSink when restoring > > I guess writing a new file would take much longer than just using the > .valid-length file, especially if the files are very large. The > restoring time should be as minimal as possible to ensure little > downtime on restarts. > > Regards, > Timo > > > Am 15.05.18 um 09:31 schrieb Gary Yao: > > Hi, > > > > The BucketingSink truncates the file if the Hadoop FileSystem > supports this > > operation (Hadoop 2.7 and above) [1]. What version of Hadoop are you > using? > > > > Best, > > Gary > > > > [1] > > > https://github.com/apache/flink/blob/bcd028d75b0e5c5c691e24640a2196b2fdaf85e0/flink-connectors/flink-connector-filesystem/src/main/java/org/apache/flink/streaming/connectors/fs/bucketing/BucketingSink.java#L301 > > > > On Mon, May 14, 2018 at 1:37 PM, ?????? <342689...@qq.com> wrote: > > > >> Hi > >> > >> > >> I'm trying to copy data from kafka to HDFS . The data in HDFS is > used to > >> do other computations by others in map/reduce. > >> If some tasks failed, the ".valid-length" file is created for the low > >> version hadoop. The problem is other people must know how to deal > with the > >> ".valid-length" file, otherwise, the data may be not exactly-once. > >> Hence, why not rewrite a new file when restoring instead of writing a > >> ".valid-length" file. In this way, others who use the data in HDFS > don't > >> need to know how to deal with the ".valid-length" file. > >> > >> > >> Thanks! > >> > >> > >> Zhang Xinyu >
