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https://issues.apache.org/jira/browse/JENA-1553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16668688#comment-16668688
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Andy Seaborne commented on JENA-1553:
-------------------------------------
bq. It is running without problems since months.
What might have happened is that sometime in the past, possibly a long time
ago, a corrupted node was written to the node table. But it will also be in the
node table cache as a valid node (it was the writing stage that was going
wrong).
While in the cache, or because that node was not required, the sever will
continue to run with no errors.
However, when restarted, nodes are read back in from the node table on-demand.
at which point the node corruption becomes a problem.
Sorry but the data will have to be reloaded.
> Can't Backup data - java.io.IOException: Illegal UTF-8: 0xFFFFFFB1
> ------------------------------------------------------------------
>
> Key: JENA-1553
> URL: https://issues.apache.org/jira/browse/JENA-1553
> Project: Apache Jena
> Issue Type: Bug
> Components: Jena
> Environment: Ubuntu 16.04 running Docker. Running stain/jena-fuseki
> from the official Docker Hub.
> Reporter: Brian Mullen
> Assignee: Andy Seaborne
> Priority: Major
> Fix For: Jena 3.9.0
>
>
> Attempting to backup through Fuseki, TDB 500M+ triples, breaking with error:
>
> {code:java}
> [2018-06-01 13:25:46] Log4jLoggerAdapter WARN Exception in backup
> org.apache.jena.atlas.RuntimeIOException: java.io.IOException: Illegal UTF-8:
> 0xFFFFFFB1
> at org.apache.jena.atlas.io.IO.exception(IO.java:233)
> at org.apache.jena.atlas.io.BlockUTF8.exception(BlockUTF8.java:275)
> at
> org.apache.jena.atlas.io.BlockUTF8.toCharsBuffer(BlockUTF8.java:150)
> at org.apache.jena.atlas.io.BlockUTF8.toChars(BlockUTF8.java:73)
> at org.apache.jena.atlas.io.BlockUTF8.toString(BlockUTF8.java:95)
> at
> org.apache.jena.tdb.store.nodetable.NodecSSE.decode(NodecSSE.java:101)
> at org.apache.jena.tdb.lib.NodeLib.decode(NodeLib.java:105)
> at org.apache.jena.tdb.lib.NodeLib.fetchDecode(NodeLib.java:81)
> at
> org.apache.jena.tdb.store.nodetable.NodeTableNative.readNodeFromTable(NodeTableNative.java:186)
> at
> org.apache.jena.tdb.store.nodetable.NodeTableNative._retrieveNodeByNodeId(NodeTableNative.java:111)
> at
> org.apache.jena.tdb.store.nodetable.NodeTableNative.getNodeForNodeId(NodeTableNative.java:70)
> at
> org.apache.jena.tdb.store.nodetable.NodeTableCache._retrieveNodeByNodeId(NodeTableCache.java:128)
> at
> org.apache.jena.tdb.store.nodetable.NodeTableCache.getNodeForNodeId(NodeTableCache.java:82)
> at
> org.apache.jena.tdb.store.nodetable.NodeTableWrapper.getNodeForNodeId(NodeTableWrapper.java:50)
> at
> org.apache.jena.tdb.store.nodetable.NodeTableInline.getNodeForNodeId(NodeTableInline.java:67)
> at org.apache.jena.tdb.lib.TupleLib.triple(TupleLib.java:107)
> at org.apache.jena.tdb.lib.TupleLib.triple(TupleLib.java:84)
> at
> org.apache.jena.tdb.lib.TupleLib.lambda$convertToTriples$2(TupleLib.java:54)
> at org.apache.jena.atlas.iterator.Iter$2.next(Iter.java:270)
> at org.apache.jena.atlas.iterator.Iter$2.next(Iter.java:270)
> at org.apache.jena.atlas.iterator.Iter.next(Iter.java:891)
> at
> org.apache.jena.riot.system.StreamOps.sendQuadsToStream(StreamOps.java:140)
> at
> org.apache.jena.riot.writer.NQuadsWriter.write$(NQuadsWriter.java:62)
> at
> org.apache.jena.riot.writer.NQuadsWriter.write(NQuadsWriter.java:45)
> at
> org.apache.jena.riot.writer.NQuadsWriter.write(NQuadsWriter.java:91)
> at org.apache.jena.riot.RDFWriter.write$(RDFWriter.java:208)
> at org.apache.jena.riot.RDFWriter.output(RDFWriter.java:165)
> at org.apache.jena.riot.RDFWriter.output(RDFWriter.java:112)
> at
> org.apache.jena.riot.RDFWriterBuilder.output(RDFWriterBuilder.java:149)
> at org.apache.jena.riot.RDFDataMgr.write$(RDFDataMgr.java:1269)
> at org.apache.jena.riot.RDFDataMgr.write(RDFDataMgr.java:1162)
> at org.apache.jena.riot.RDFDataMgr.write(RDFDataMgr.java:1153)
> at org.apache.jena.fuseki.mgt.Backup.backup(Backup.java:115)
> at org.apache.jena.fuseki.mgt.Backup.backup(Backup.java:75)
> at
> org.apache.jena.fuseki.mgt.ActionBackup$BackupTask.run(ActionBackup.java:58)
> at
> org.apache.jena.fuseki.async.AsyncPool.lambda$submit$0(AsyncPool.java:55)
> at org.apache.jena.fuseki.async.AsyncTask.call(AsyncTask.java:100)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.io.IOException: Illegal UTF-8: 0xFFFFFFB1
> ... 40 more
> [2018-06-01 13:25:46] Log4jLoggerAdapter INFO
> Backup(/fuseki/backups/PDE_PROD_2018-06-01_13-24-00):2{code}
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