Derby
  1. Derby
  2. DERBY-4923

update of a long row can fail with ERROR nospc: nospc.U exception.

    Details

    • Urgency:
      Urgent
    • Issue & fix info:
      High Value Fix, Patch Available, Repro attached
    • Bug behavior facts:
      Data corruption

      Description

      An update of a row fails with a nospc.U exception. If there is space on the disk then an update should never fail for a space
      issue. The code is meant to always reserve enough space on a page such that if an expanding update happens that does not
      fit, it should in the worst case change the row to an overflow row pointer and put the rest in a linked overflow chain.

      The following set of circumstances will cause this bug (not sure which are exactly needed - just what i did to
      cause the repro), I will be attaching a test case:
      The row being updated has the following characteristics:
      o located on 4k page
      o 2 colum row with 2nd column a blob column
      o the row is a long row with first piece having 1st column on main page, and the 2nd piece having just blob column on overflow page.
      o before the update there is 0 free space on the overflow page.
      o the update causes the blob column to expand past 4k

      Caused by: java.sql.SQLException: nospc.U
      at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(SQLExceptionFactory.java:45)
      at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(SQLExceptionFactory40.java:119)
      at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(SQLExceptionFactory40.java:70)
      ... 39 more
      Caused by: ERROR nospc: nospc.U
      at org.apache.derby.impl.store.raw.data.StoredPage.logRow(StoredPage.java:4155)
      at org.apache.derby.impl.store.raw.data.UpdateOperation.writeOptionalDataToBuffer(UpdateOperation.java:255)
      at org.apache.derby.impl.store.raw.data.UpdateOperation.<init>(UpdateOperation.java:106)
      at org.apache.derby.impl.store.raw.data.LoggableActions.actionUpdate(LoggableActions.java:80)
      at org.apache.derby.impl.store.raw.data.StoredPage.doUpdateAtSlot(StoredPage.java:8625)
      at org.apache.derby.impl.store.raw.data.BasePage.updateAtSlot(BasePage.java:1062)
      at org.apache.derby.impl.store.access.conglomerate.GenericConglomerateController.replace(GenericConglomerateController.java:486)
      at org.apache.derby.impl.sql.execute.RowChangerImpl.updateRow(RowChangerImpl.java:523)
      at org.apache.derby.impl.sql.execute.UpdateResultSet.collectAffectedRows(UpdateResultSet.java:569)
      at org.apache.derby.impl.sql.execute.UpdateResultSet.open(UpdateResultSet.java:264)
      at org.apache.derby.impl.sql.GenericPreparedStatement.executeStmt(GenericPreparedStatement.java:436)
      at org.apache.derby.impl.sql.GenericPreparedStatement.execute(GenericPreparedStatement.java:317)
      at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(EmbedStatement.java:1241)
      ... 33 more

      1. derby4923repro.diff
        12 kB
        Mike Matrigali
      2. derby.log
        36 kB
        Mike Matrigali
      3. DERBY_4923.java
        7 kB
        Rick Hillegas
      4. derby-4923-tt-aa-NoSpaceOnPageExtendsException.diff
        11 kB
        Rick Hillegas
      5. DERBY-4923.diff
        14 kB
        Mike Matrigali

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            • Assignee:
              Mike Matrigali
              Reporter:
              Mike Matrigali
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              Dates

              • Created:
                Updated:
                Resolved:

                Development