Hello everyone,
I want to use aws s3 as sink for a data stream in flink. I am using
StreamingFileSink class to create a sink.
I don't need checkpointing for my job, but when I disable checkpointing,
data is no longer written to S3.
case 1 : checkpointing enabled
When checkpointing is enabled, the data is successfully ingested to the
mentioned s3 path.
case 2 : checkpointing disabled
When checkpointing is disabled, the data is not written to s3.
I tried executing the job multiple times, but every time I got the same
result. I am facing this on local machine as well as on kubernetes cluster.
Following is a code I tried having bounded stream -
object FlinkTestJob {
def main(args: Array[String]): Unit = {
val env = StreamExecutionEnvironment.getExecutionEnvironment
// with checkpointing enabled
env.enableCheckpointing(100)
// Sinks
val streamStrings: Seq[String] =
Seq("test1", "test2", "test3", "test4", "test5", "test6",
"test7", "test8", "test9", "test10")
val testStream = env.fromCollection(streamStrings)
val rollingPolicy = new RollingPolicy[String, String] {
override def shouldRollOnCheckpoint(partFileState:
PartFileInfo[String]): Boolean =
partFileState.getSize > 1
override def shouldRollOnEvent(
partFileState: PartFileInfo[String],
element: String): Boolean = true
override def shouldRollOnProcessingTime(
partFileState: PartFileInfo[String],
currentTime: Long): Boolean = true
}
val sink: StreamingFileSink[String] = StreamingFileSink
.forRowFormat(new Path("s3a://testbucket/sink"), new
SimpleStringEncoder[String]("UTF-8"))
.withRollingPolicy(rollingPolicy)
.build()
testStream.addSink(sink)
env.execute("test-job")
}
}
When I write to s3 using "writeAsText("s3a://testbucket/sink")" instead of
StreamingFileSink, it works perfectly fine regardless of whether or not
checkpointing is enabled.
Flink version : 1.8.0
I want to understand the relation between checkpointing and
StreamingFileSink.
- Thanks
--
*_Grab is hiring. Learn more at _**https://grab.careers
<https://grab.careers/>*
By communicating with Grab Inc and/or its
subsidiaries, associate companies and jointly controlled entities (“Grab
Group”), you are deemed to have consented to processing of your personal
data as set out in the Privacy Notice which can be viewed at
https://grab.com/privacy/ <https://grab.com/privacy/>
This email contains
confidential information and is only for the intended recipient(s). If you
are not the intended recipient(s), please do not disseminate, distribute or
copy this email and notify Grab Group immediately if you have received this
by mistake and delete this email from your system. Email transmission
cannot be guaranteed to be secure or error-free as any information therein
could be intercepted, corrupted, lost, destroyed, delayed or incomplete, or
contain viruses. Grab Group do not accept liability for any errors or
omissions in the contents of this email arises as a result of email
transmission. All intellectual property rights in this email and
attachments therein shall remain vested in Grab Group, unless otherwise
provided by law.
