Spurious StreamSegmentNotExistsException from WriterTableProcessor

[andreipaduroiu]

Describe the bug

2021-03-15 10:39:42,842 1010918143 [core-26] ERROR i.p.s.server.writer.StorageWriter - StorageWriter[14]: Iteration[4475300].Error.
io.pravega.segmentstore.contracts.StreamSegmentNotExistsException: [Segment 'XYZ'] The StreamSegment does not exist.
        at io.pravega.segmentstore.server.containers.MetadataStore.getOrAssignSegmentId(MetadataStore.java:357)
        at io.pravega.segmentstore.server.containers.StreamSegmentContainer.forSegment(StreamSegmentContainer.java:606)
        at io.pravega.segmentstore.server.tables.ContainerTableExtensionImpl$TableWriterConnectorImpl.getSegment(ContainerTableExtensionImpl.java:563)
        at io.pravega.segmentstore.server.tables.WriterTableProcessor.flush(WriterTableProcessor.java:161)
        at io.pravega.segmentstore.server.writer.StorageWriter$ProcessorCollection.lambda$flush$0(StorageWriter.java:645)
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
        at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Unknown Source)
        at java.base/java.util.stream.AbstractPipeline.copyInto(Unknown Source)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source)
        at java.base/java.util.stream.AbstractPipeline.evaluate(Unknown Source)
        at java.base/java.util.stream.ReferencePipeline.collect(Unknown Source)
        at io.pravega.segmentstore.server.writer.StorageWriter$ProcessorCollection.flush(StorageWriter.java:645)
        at io.pravega.segmentstore.server.writer.StorageWriter.lambda$flush$8(StorageWriter.java:312)

To Reproduce
Happens sometimes when deleting segments. In some cases this error is logged continuously.

Expected behavior
Log at most once, then do not log again.