IndexOutOfBounds when storing with channel count >= 2 (more likely with higher channel count) #150
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m-stoer
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I got a similar exception at startup, channels are set to 4 and backup is enabled. |
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Just got the same exception as i just posted with 2 channels and no Backup... |
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I have set my channel count to 16 and disabled the setup backup and now I also get the same exception on the second start. So it seems that it has to do with the channel count and not with the backup. |
m-stoer
changed the title
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With my initial attempts, I could not reproduce this. |
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100% reproducible on my side: final List<String> root = new ArrayList<>();
final NioFileSystem fs = NioFileSystem.New();
final EmbeddedStorageManager storageManager = EmbeddedStorage.Foundation()
.setConfiguration(
StorageConfiguration.Builder()
.setChannelCountProvider(StorageChannelCountProvider.New(4))
.setBackupSetup(
StorageBackupSetup.New(
StorageBackupFileProvider.Builder(fs)
.setDirectory(fs.ensureDirectoryPath("backup"))
.createFileProvider()
)
)
.createConfiguration()
)
.setRoot(root)
.createEmbeddedStorageManager()
.start();
root.add("HEHE");
storageManager.storeRoot();
storageManager.shutdown(); |
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Some additional observations: To get the one.microstream.exceptions.IndexBoundsException: Index out of bounds: 0 not in [0;0[ (StartIndex >= bound) exception with fh’s code I need do disable the Backup and run it three times. |
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Further debugging showed the following: |
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Actually, the problem is caused when 0 bytes are read from a file. Nevertheless it should be investigated, what causes the empty writes and reads, or what purpose they serve. |
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The Zero-sized file is created during housekeeping in the second run: |
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Ich kann das nicht mehr nachvolziehen. Ok |
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Tested on current master (80fc56f)
Whenever I start the storage with backup enabled and a channel count of 2, the first start has no problems. But when I start the application again, it will give me an IndexOutOfBounds when trying to copy a channel file to the backup location. This doesn't happen when the channel count is 1.
If the channel count is greater or equal to 4 then I always get this exception on the first store.
This is my code:
(The sleep is there so the exception output doesn't overlap with the exception message that comes from the shutdown)
Exception when starting with channel count of 4:
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