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# Known Issues
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Details on previously identified known issues are provided below. Details on known issues identfied
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in the current release are provided in the [Changelog](CHANGELOG.md).
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Known issues are open issues categorized as [Very High or High impact](https://wiki.hyperledger.org/display/BESU/Defect+Prioritisation+Policy).
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## Fast sync when running Besu on cloud providers
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A known [RocksDB issue](https://github.com/facebook/rocksdb/issues/6435) causes fast sync to fail
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when running Besu on certain cloud providers. The following error is displayed repeatedly:
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```
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...
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EthScheduler-Services-1 (importBlock) | ERROR | PipelineChainDownloader | Chain download failed. Restarting after short delay.
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java.util.concurrent.CompletionException: org.hyperledger.besu.plugin.services.exception.StorageException: org.rocksdb.RocksDBException: block checksum mismatch:
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....
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```
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This behaviour has been seen on AWS and Digital Ocean.
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Workaround -> On AWS, a full restart of the AWS VM is required to restart the fast sync.
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Fast sync is not currently supported on Digital Ocean. We are investigating options to
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[add support for fast sync on Digital Ocean](https://github.com/hyperledger/besu/issues/591).
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## Privacy users with private transactions created using v1.3.4 or earlier
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A critical issue for privacy users with private transactions created using Hyperledger Besu v1.3.4
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or earlier has been identified. If you have a network with private transaction created using v1.3.4
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or earlier, please read the following and take the appropriate steps:
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https://wiki.hyperledger.org/display/BESU/Critical+Issue+for+Privacy+Users
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