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Date: Thu, 18 Mar 2010 09:58:27 +0000 (UTC)
From: "Julian Sedding (JIRA)" <jira@apache.org>
To: dev@jackrabbit.apache.org
Subject: [jira] Updated: (JCR-2576) DbInputStream does not support
 mark()/reset() when exhausted.
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     [ https://issues.apache.org/jira/browse/JCR-2576?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Sedding updated JCR-2576:
--------------------------------

    Attachment: DbInputStream.patch

I have started working on a patch, which is not fully functional yet. Unfortunately I currently don't have time to finish it off. It should illustrate a possible approach to solve the problem though.

> DbInputStream does not support mark()/reset() when exhausted.
> -------------------------------------------------------------
>
>                 Key: JCR-2576
>                 URL: https://issues.apache.org/jira/browse/JCR-2576
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>          Components: jackrabbit-core
>    Affects Versions: 2.0.0
>            Reporter: Julian Sedding
>            Assignee: Thomas Mueller
>         Attachments: DbInputStream.patch
>
>
> The DbDataStore implementation uses a DbInputStream to read binary properties from the database. When a new binary property is created, Jackrabbit attempts to index it. Tika's CharsetDetector is used in the process, which marks the input stream, reads the first 8000 bytes and then resets the stream.
> This results in the stacktrace shown at the end of the issue, if the following two conditions hold true:
> * the property is larger than the minRecordLength configuration of the Datastore and
> * the property is smaller than 8000 bytes
> The DbInputStream needs to have the following properties:
> 1. lazy instantiation of the underlying stream
> 2. auto-close underlying stream when EOF is reached
> 3. fully support mark()/reset() even if  the underlying stream is auto-closed due to 2.
> 12.03.2010 15:53:28 *WARN * LazyTextExtractorField: Failed to extract text from a binary property (LazyTextExtractorField.java, line 165)
> java.io.EOFException
>         at org.apache.jackrabbit.core.data.db.DbInputStream.reset(DbInputStream.java:180)
>         at org.apache.tika.io.ProxyInputStream.reset(ProxyInputStream.java:156)
>         at org.apache.tika.io.ProxyInputStream.reset(ProxyInputStream.java:156)
>         at org.apache.tika.parser.txt.CharsetDetector.setText(CharsetDetector.java:131)
>         at org.apache.tika.parser.txt.TXTParser.parse(TXTParser.java:77)
>         at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:120)
>         at org.apache.tika.parser.AutoDetectParser.parse(AutoDetectParser.java:101)
>         at org.apache.tika.parser.AutoDetectParser.parse(AutoDetectParser.java:114)
>         at org.apache.jackrabbit.core.query.lucene.LazyTextExtractorField$ParsingTask.run(LazyTextExtractorField.java:160)
>         at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
>         at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:138)
>         at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)
>         at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:207)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>         at java.lang.Thread.run(Thread.java:619)

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