Re: [tracecompass-dev] StringStateValue - limit on string size with FULL

[Geneviève Bastien <gbastien+lttng@xxxxxxxxxxxx>]

TraceCompass follows Eclipse's simultaneous releases [1]. So TraceCompass 2.1 containing this commit (and much more! :D) will be available September 28.

[1] https://wiki.eclipse.org/Simultaneous_Release

Thanks for your feedback,
Geneviève


On 07/29/2016 05:33 PM, Rocky Dunlap - NOAA Affiliate wrote:

Geneviève,

That's good news.  

When will the new commit be released?  Until then I will work around with 127 char limit.

Thanks,

Rocky

On Fri, Jul 29, 2016 at 3:28 PM, Geneviève Bastien <gbastien+lttng@xxxxxxxxxxxx> wrote:

Hi Rocky,

The history tree used to limit the size of Strings to 127 bytes, but it wasn't checked, it was hoping that the caller would not add larger strings. This was fixed in commit [1] The strings now have a maximum of 32767 bytes. But from the date, it is not part of TraceCompass 2.0. If you get a development snapshot though you'll be able to put larger strings in the history tree.

[1] http://git.eclipse.org/c/tracecompass/org.eclipse.tracecompass.git/commit/?id=8182f36f96bbe3f33cc4c4838853239d2efe315a

Best regards,
Geneviève

On 07/29/2016 05:01 PM, Rocky Dunlap - NOAA Affiliate wrote:

I have a state system set up using the FULL history backend.  I noticed that I was receiving the stack trace below when the history is read back in from file.  The issue goes away when I limit the size of strings in StringStateValue to less than 100 bytes.

I tried to up the blocksize from 64*1024 to some very large value, but that did not seem to do the trick.  I did not study it exhaustively, but I did not see any checking in the HTNode write code to prevent buffer overruns.  Maybe that is the issue?

Basically, I'd like to know how I can store longer strings using the FULL history option.  It works fine when using the INMEM option, but I'll need the disk option for larger traces.

java.lang.NegativeArraySizeException

at org.eclipse.tracecompass.internal.statesystem.core.backend.historytree.HTInterval.readFrom(HTInterval.java:187)

at org.eclipse.tracecompass.internal.statesystem.core.backend.historytree.HTNode.readNode(HTNode.java:218)

at org.eclipse.tracecompass.internal.statesystem.core.backend.historytree.HT_IO.readNode(HT_IO.java:140)

at org.eclipse.tracecompass.internal.statesystem.core.backend.historytree.HistoryTree.buildLatestBranch(HistoryTree.java:223)

at org.eclipse.tracecompass.internal.statesystem.core.backend.historytree.HistoryTree.<init>(HistoryTree.java:197)

at org.eclipse.tracecompass.internal.statesystem.core.backend.historytree.HistoryTreeBackend.<init>(HistoryTreeBackend.java:148)

at org.eclipse.tracecompass.statesystem.core.backend.StateHistoryBackendFactory.createHistoryTreeBackendExistingFile(StateHistoryBackendFactory.java:116)

at org.eclipse.tracecompass.tmf.core.statesystem.TmfStateSystemAnalysisModule.createFullHistory(TmfStateSystemAnalysisModule.java:302)

at org.eclipse.tracecompass.tmf.core.statesystem.TmfStateSystemAnalysisModule.executeAnalysis(TmfStateSystemAnalysisModule.java:227)

at org.eclipse.tracecompass.tmf.core.analysis.TmfAbstractAnalysisModule$1.run(TmfAbstractAnalysisModule.java:351)

at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

Thanks!

Rocky

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