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https://issues.apache.org/jira/browse/JENA-1516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16426648#comment-16426648
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ASF subversion and git services commented on JENA-1516:
-------------------------------------------------------

Commit ab8d0f4e71039e1049d355ad37109c2bb515b803 in jena's branch 
refs/heads/master from [~andy.seaborne]
[ https://git-wip-us.apache.org/repos/asf?p=jena.git;h=ab8d0f4 ]

JENA-1516: Simplify write. Sync writer buffer; protect length read.

Remove alloc-write.


> Concurrency issues with ObjectFileStorage
> -----------------------------------------
>
>                 Key: JENA-1516
>                 URL: https://issues.apache.org/jira/browse/JENA-1516
>             Project: Apache Jena
>          Issue Type: Bug
>          Components: TDB
>    Affects Versions: Jena 3.5.0, Jena 3.6.0
>            Reporter: Andy Seaborne
>            Assignee: Andy Seaborne
>            Priority: Critical
>         Attachments: FusekiConcurrencyTest.java, LOG-360, log4j-t.properties
>
>
> Original [user@jena email 
> report|https://lists.apache.org/thread.html/876e6f69b7953bd0ac91ab85f5687ff6f2d9dfe202d8553602ba7c42@%3Cusers.jena.apache.org%3E].
> This is under high load. In the attached test case, at least 50 queries and 
> 50 updates issues by 25 threads are necessary to get any sort of likelihood 
> of a failure.
> Failures of alloc-write are exasperated by the fact flag for checking is not 
> volatile.
> The database is not permanently corrupted, however, updates can be lost.
> Errors include the ones below - this is not exhaustive.
> Errors, generated with a v3.6.0 server:
> Some are consequences of earlier errors.
> {noformat}
> rm -rf DB ; fuseki-basic --loc DB --update /ds
> {noformat}
> {noformat}
> 21:15:56 qtp826865256-16 ERROR BindingTDB           :: get1(?s)
> java.nio.BufferOverflowException
>       at java.nio.HeapByteBuffer.put(HeapByteBuffer.java:214)
>       at sun.nio.ch.IOUtil.read(IOUtil.java:200)
>       at sun.nio.ch.FileChannelImpl.readInternal(FileChannelImpl.java:741)
>       at sun.nio.ch.FileChannelImpl.read(FileChannelImpl.java:727)
>       at 
> org.apache.jena.tdb.base.file.BufferChannelFile.read(BufferChannelFile.java:112)
> 21:15:56 qtp826865256-13 ERROR BindingTDB           :: get1(?p)
> java.lang.IllegalArgumentException
>       at java.nio.Buffer.position(Buffer.java:244)
>       at java.nio.HeapByteBuffer.put(HeapByteBuffer.java:216)
>       at sun.nio.ch.IOUtil.read(IOUtil.java:200)
>       at sun.nio.ch.FileChannelImpl.readInternal(FileChannelImpl.java:741)
>       at sun.nio.ch.FileChannelImpl.read(FileChannelImpl.java:727)
>       at 
> org.apache.jena.tdb.base.file.BufferChannelFile.read(BufferChannelFile.java:112)
> 21:15:56 qtp826865256-16 ERROR BindingTDB           :: get1(?s)
> org.apache.jena.tdb.base.file.FileException: 
> ObjectFileStorage.read[nodes](486)[filesize=2280][file.size()=2280]: Failed 
> to read the length : got 0 bytes
>       at 
> org.apache.jena.tdb.base.objectfile.ObjectFileStorage.read(ObjectFileStorage.java:341)
>       at 
> org.apache.jena.tdb.base.objectfile.ObjectFileWrapper.read(ObjectFileWrapper.java:57)
>       at 
> org.apache.jena.tdb.base.objectfile.ObjectFileWrapper.read(ObjectFileWrapper.java:57)
>       at org.apache.jena.tdb.lib.NodeLib.fetchDecode(NodeLib.java:78)
> 21:15:56 qtp826865256-15 ERROR BindingTDB           :: get1(?o)
> org.apache.jena.tdb.base.file.FileException: 
> ObjectFileStorage.read[nodes](59)[filesize=2326][file.size()=2326]: Failed to 
> read the length : got 0 bytes
>       at 
> org.apache.jena.tdb.base.objectfile.ObjectFileStorage.read(ObjectFileStorage.java:341)
>       at 
> org.apache.jena.tdb.base.objectfile.ObjectFileWrapper.read(ObjectFileWrapper.java:57)
>       at 
> org.apache.jena.tdb.base.objectfile.ObjectFileWrapper.read(ObjectFileWrapper.java:57)
>       at 
> org.apache.jena.tdb.base.objectfile.ObjectFileWrapper.read(ObjectFileWrapper.java:57)
>       at 
> org.apache.jena.tdb.base.objectfile.ObjectFileWrapper.read(ObjectFileWrapper.java:57)
>       at org.apache.jena.tdb.lib.NodeLib.fetchDecode(NodeLib.java:78)
> 21:15:56 qtp826865256-13 ERROR BindingTDB           :: get1(?s)
> java.nio.BufferOverflowException
>       at java.nio.HeapByteBuffer.put(HeapByteBuffer.java:214)
>       at sun.nio.ch.IOUtil.read(IOUtil.java:200)
>       at sun.nio.ch.FileChannelImpl.readInternal(FileChannelImpl.java:741)
>       at sun.nio.ch.FileChannelImpl.read(FileChannelImpl.java:727)
>       at 
> org.apache.jena.tdb.base.file.BufferChannelFile.read(BufferChannelFile.java:112)
>       at org.apache.jena.tdb.lib.NodeLib.fetchDecode(NodeLib.java:78)
> 21:15:56 qtp826865256-13 ERROR BindingTDB           :: get1(?s)
> java.lang.IllegalArgumentException
>       at java.nio.Buffer.position(Buffer.java:244)
>       at java.nio.HeapByteBuffer.put(HeapByteBuffer.java:216)
>       at sun.nio.ch.IOUtil.read(IOUtil.java:200)
>       at sun.nio.ch.FileChannelImpl.readInternal(FileChannelImpl.java:741)
>       at sun.nio.ch.FileChannelImpl.read(FileChannelImpl.java:727)
>       at 
> org.apache.jena.tdb.base.file.BufferChannelFile.read(BufferChannelFile.java:112)
> {noformat}



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