chibenwa commented on pull request #485:
URL: https://github.com/apache/james-project/pull/485#issuecomment-857444966
```
05:55:00.100 [ERROR] o.a.j.w.s.ExportService - Error exporting mailboxes of
user: username@domain
java.lang.IllegalStateException: block()/blockFirst()/blockLast() are
blocking, which is not supported in thread parallel-5
at
reactor.core.publisher.BlockingSingleSubscriber.blockingGet(BlockingSingleSubscriber.java:83)
at reactor.core.publisher.Mono.block(Mono.java:1703)
at
org.apache.james.blob.objectstorage.aws.S3BlobStoreDAO.read(S3BlobStoreDAO.java:129)
at
org.apache.james.server.blob.deduplication.DeDuplicationBlobStore.read(DeDuplicationBlobStore.scala:100)
at org.apache.james.blob.api.BlobStore.read(BlobStore.java:56)
at
org.apache.james.server.blob.deduplication.DeDuplicationBlobStore.read(DeDuplicationBlobStore.scala:43)
at
org.apache.james.blob.api.MetricableBlobStore.lambda$read$1(MetricableBlobStore.java:87)
at
org.apache.james.metrics.api.MetricFactory.decorateSupplierWithTimerMetric(MetricFactory.java:37)
at
org.apache.james.blob.api.MetricableBlobStore.read(MetricableBlobStore.java:87)
at
org.apache.james.blob.export.file.LocalFileBlobExportMechanism.copyBlobToFile(LocalFileBlobExportMechanism.java:126)
at
org.apache.james.blob.export.file.LocalFileBlobExportMechanism.lambda$blobId$0(LocalFileBlobExportMechanism.java:111)
at
org.apache.james.webadmin.service.ExportService.lambda$export$7(ExportService.java:133)
at
com.github.fge.lambdas.runnable.RunnableChainer.lambda$sneakyThrow$215(RunnableChainer.java:71)
```
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