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From "Mike Matrigali (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-4577) An expanding update fails with an nospc.U error.
Date Sat, 06 Mar 2010 00:43:27 GMT
An expanding update fails with an nospc.U error.
------------------------------------------------

                 Key: DERBY-4577
                 URL: https://issues.apache.org/jira/browse/DERBY-4577
             Project: Derby
          Issue Type: Bug
    Affects Versions: 10.6.0.0
            Reporter: Mike Matrigali
            Assignee: Mike Matrigali


An update of a long row piece on an overflow page that has limited row used space, row reserved
space, and page free space can throw the nospc.U error on an update.  I will attach a patch
with a simple junit test that reproduces this
issue.  

This issue is probably the same as DERBY-2286.  Logging a new issue so that it is clear the
associated changes fix
the attached repro.  The repro for DERBY-2286 is random and I could only get it to fail on
one machine.  If after the fix
for this goes in and no one can repro, then we can close DERBY-2286 as a repro.

The nospc errror is never meant to get to the user.  The code path that can raise it is shared
by insert and update.  
Insert has code that internally catches the error and does the right thing.  The error should
never be raised for an update.  What is meant to happen for updates is that on update on any
page, including an overflow page should always
in the worst case have enough room to transform the row piece from whatever it is to a just
a row header with an
overflow pointer to the next piece.  

For the attached test the row piece on the overflow page is 12 bytes reserved, and 0 bytes
free on the page.  So 
far in the code path the code has written a preliminary row header that is 4 bytes, and then
has noticed that the
remaining 8 bytes are not enough for an overflow pointer (worst case 8 bytes for page number
+ 4 bytes for record
id).  

I think the real problem is that not enough minimum space is being reserved on the overflow
page.  There should be
12 bytes reserved + the maximum size of a record header that does not include an overflow
pointer.   I think the
code does the right thing in the case of head pages where the minimum reserved space is 12
for the "user" portion
of the data, but it looks like we don't apply this reserved space to just user portion on
overflow pages.

I need to research more, but it looks like on overflow pages we apply the minimum reserved
space to the entire row
rather than just the user space.

The stack trace being thrown in this case is:
2010-03-06 00:18:40.750 GMT:
 Booting Derby version The Apache Software Foundation - Apache Derby - 10.6.0.0 alpha - (1):
instance 3405c0cb-0127-30d6-6168-ffffe7
008b2c
on database directory C:\derby\s2\systest\out\junit\system\wombat
^M
Database Class Loader started - derby.database.classpath=''^M
2010-03-06 00:18:41.171 GMT Thread[main,5,main] (XID = 253), (SESSIONID = 1), (DATABASE =
wombat), (DRDAID = null), Cleanup action s
tarting^M
2010-03-06 00:18:41.171 GMT Thread[main,5,main] (XID = 253), (SESSIONID = 1), (DATABASE =
wombat), (DRDAID = null), Failed Statement
 is: UPDATE testBadUpdate set value = ? where id = ? with 2 parameters begin parameter #1:
BLOB:Length=120000 :end parameter begin p
arameter #2: 0 :end parameter ^M
ERROR nospc: nospc.U^M
    at org.apache.derby.impl.store.raw.data.StoredPage.logRow(StoredPage.java:4106)^M
    at org.apache.derby.impl.store.raw.data.UpdateOperation.writeOptionalDataToBuffer(UpdateOperation.java:255)^M
    at org.apache.derby.impl.store.raw.data.UpdateOperation.<init>(UpdateOperation.java:106)^M
    at org.apache.derby.impl.store.raw.data.LoggableActions.actionUpdate(LoggableActions.java:80)^M
    at org.apache.derby.impl.store.raw.data.StoredPage.doUpdateAtSlot(StoredPage.java:8551)^M
    at org.apache.derby.impl.store.raw.data.BasePage.updateAtSlot(BasePage.java:1062)^M
    at org.apache.derby.impl.store.access.conglomerate.GenericConglomerateController.replace(GenericConglomerateController.java:472)
^M
    at org.apache.derby.impl.sql.execute.RowChangerImpl.updateRow(RowChangerImpl.java:523)^M
    at org.apache.derby.impl.sql.execute.UpdateResultSet.collectAffectedRows(UpdateResultSet.java:554)^M
    at org.apache.derby.impl.sql.execute.UpdateResultSet.open(UpdateResultSet.java:254)^M
    at org.apache.derby.impl.sql.GenericPreparedStatement.executeStmt(GenericPreparedStatement.java:436)^M
    at org.apache.derby.impl.sql.GenericPreparedStatement.execute(GenericPreparedStatement.java:317)^M
    at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(EmbedStatement.java:1232)^M
    at org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeStatement(EmbedPreparedStatement.java:1673)^M
    at org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeUpdate(EmbedPreparedStatement.java:303)^M
    at org.apache.derbyTesting.functionTests.tests.store.DerbyBugTest2.run_one(DerbyBugTest2.java:224)^M
    at org.apache.derbyTesting.functionTests.tests.store.DerbyBugTest2.testOne(DerbyBugTest2.java:84)^M
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)^M
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:48)^M
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)^M
    at java.lang.reflect.Method.invoke(Method.java:600)^M
    at junit.framework.TestCase.runTest(TestCase.java:154)^M
    at junit.framework.TestCase.runBare(TestCase.java:127)^M
    at org.apache.derbyTesting.junit.BaseTestCase.runBare(BaseTestCase.java:109)^M
    at junit.framework.TestResult$1.protect(TestResult.java:106)^M
    at junit.framework.TestResult.runProtected(TestResult.java:124)^M
    at junit.framework.TestResult.run(TestResult.java:109)^M
    at junit.framework.TestCase.run(TestCase.java:118)^M
    at junit.framework.TestSuite.runTest(TestSuite.java:208)^M
    at junit.framework.TestSuite.run(TestSuite.java:203)^M
    at junit.framework.TestSuite.runTest(TestSuite.java:208)^M
    at junit.framework.TestSuite.run(TestSuite.java:203)^M
    at junit.extensions.TestDecorator.basicRun(TestDecorator.java:22)^M
    at junit.extensions.TestSetup$1.protect(TestSetup.java:19)^M
    at junit.framework.TestResult.runProtected(TestResult.java:124)^M
    at junit.extensions.TestSetup.run(TestSetup.java:23)^M
    at org.apache.derbyTesting.junit.BaseTestSetup.run(BaseTestSetup.java:57)^M
    at junit.extensions.TestDecorator.basicRun(TestDecorator.java:22)^M
    at junit.extensions.TestSetup$1.protect(TestSetup.java:19)^M
    at junit.framework.TestResult.runProtected(TestResult.java:124)^M
    at junit.extensions.TestSetup.run(TestSetup.java:23)^M
    at org.apache.derbyTesting.junit.BaseTestSetup.run(BaseTestSetup.java:57)^M
    at junit.framework.TestSuite.runTest(TestSuite.java:208)^M
    at junit.framework.TestSuite.run(TestSuite.java:203)^M
    at junit.textui.TestRunner.doRun(TestRunner.java:116)^M
    at junit.textui.TestRunner.start(TestRunner.java:172)^M
    at junit.textui.TestRunner.main(TestRunner.java:138)^M
Cleanup action completed^M

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