Examples with ContainerHandle org.apache.derby.iapi.store.raw.ContainerHandle used on opensource projects

Example 21 with ContainerHandle

use of org.apache.derby.iapi.store.raw.ContainerHandle in project derby by apache.

the class ReclaimSpaceHelper method reclaimSpace.

/**
 *		Reclaim space based on work.
 */
public static int reclaimSpace(BaseDataFileFactory dataFactory, RawTransaction tran, ReclaimSpace work) throws StandardException {
    if (work.reclaimWhat() == ReclaimSpace.CONTAINER)
        return reclaimContainer(dataFactory, tran, work);
    // Else, not reclaiming container. Get a no-wait shared lock on the
    // container regardless of how the user transaction had the
    // container opened.
    LockingPolicy container_rlock = tran.newLockingPolicy(LockingPolicy.MODE_RECORD, TransactionController.ISOLATION_SERIALIZABLE, true);
    if (SanityManager.DEBUG)
        SanityManager.ASSERT(container_rlock != null);
    ContainerHandle containerHdl = openContainerNW(tran, container_rlock, work.getContainerId());
    if (containerHdl == null) {
        tran.abort();
        if (SanityManager.DEBUG) {
            if (SanityManager.DEBUG_ON(DaemonService.DaemonTrace)) {
                SanityManager.DEBUG(DaemonService.DaemonTrace, " aborted " + work + " because container is locked or dropped");
            }
        }
        if (// retry this for serveral times
        work.incrAttempts() < 3) // it is however, unlikely that three tries will be
        // enough because there is no delay between retries.
        // See DERBY-4059 and DERBY-4055 for details.
        {
            return Serviceable.REQUEUE;
        } else {
            if (SanityManager.DEBUG) {
                if (SanityManager.DEBUG_ON(DaemonService.DaemonTrace)) {
                    SanityManager.DEBUG(DaemonService.DaemonTrace, "  gave up after 3 tries to get container lock " + work);
                }
            }
            return Serviceable.DONE;
        }
    }
    if (work.reclaimWhat() == ReclaimSpace.PAGE) {
        // Reclaiming a page - called by undo of insert which purged the
        // last row off an overflow page. It is safe to reclaim the page
        // without first locking the head row because unlike post commit
        // work, this is post abort work.  Abort is guarenteed to happen
        // and to happen only once, if at all.
        Page p = containerHdl.getPageNoWait(work.getPageId().getPageNumber());
        if (p != null)
            containerHdl.removePage(p);
        tran.commit();
        return Serviceable.DONE;
    }
    // We are reclaiming row space or long column.
    // First get an xlock on the head row piece.
    RecordHandle headRecord = work.getHeadRowHandle();
    if (!container_rlock.lockRecordForWrite(tran, headRecord, false, /* not insert */
    false)) {
        // cannot get the row lock, retry
        tran.abort();
        if (work.incrAttempts() < 3) {
            return Serviceable.REQUEUE;
        } else {
            if (SanityManager.DEBUG) {
                if (SanityManager.DEBUG_ON(DaemonService.DaemonTrace)) {
                    SanityManager.DEBUG(DaemonService.DaemonTrace, "  gave up after 3 tries to get row lock " + work);
                }
            }
            return Serviceable.DONE;
        }
    }
    if (work.reclaimWhat() == ReclaimSpace.ROW_RESERVE) {
        // This row may benefit from compaction.
        containerHdl.compactRecord(headRecord);
        // This work is being done - post commit, there is no user
        // transaction that depends on the commit being sync'd.  It is safe
        // to commitNoSync() This do as one of 2 things will happen:
        // 
        // 1) if any data page associated with this transaction is
        // moved from cache to disk, then the transaction log
        // must be sync'd to the log record for that change and
        // all log records including the commit of this xact must
        // be sync'd before returning.
        // 
        // 2) if the data page is never written then the log record
        // for the commit may never be written, and the xact will
        // never make to disk.  This is ok as no subsequent action
        // depends on this operation being committed.
        // 
        tran.commitNoSync(Transaction.RELEASE_LOCKS);
        return Serviceable.DONE;
    } else {
        if (SanityManager.DEBUG)
            SanityManager.ASSERT(work.reclaimWhat() == ReclaimSpace.COLUMN_CHAIN);
        // Reclaiming a long column chain due to update.  The long column
        // chain being reclaimed is the before image of the update
        // operation.
        // 
        long headPageId = ((PageKey) headRecord.getPageId()).getPageNumber();
        // DERBY-4050 - we wait for the page so we don't have to retry.
        // prior to the 4050 fix, we called getPageNoWait and just
        // retried 3 times.  This left unreclaimed space if we were
        // not successful after three tries.
        StoredPage headRowPage = (StoredPage) containerHdl.getPage(headPageId);
        if (headRowPage == null) {
            if (SanityManager.DEBUG) {
                if (SanityManager.DEBUG_ON(DaemonService.DaemonTrace)) {
                    SanityManager.DEBUG(DaemonService.DaemonTrace, "gave up because hadRowPage was null" + work);
                }
            }
            tran.abort();
            return Serviceable.DONE;
        }
        try {
            headRowPage.removeOrphanedColumnChain(work, containerHdl);
        } finally {
            headRowPage.unlatch();
        }
        // This work is being done - post commit, there is no user
        // transaction that depends on the commit being sync'd.  It is safe
        // to commitNoSync() This do as one of 2 things will happen:
        // 
        // 1) if any data page associated with this transaction is
        // moved from cache to disk, then the transaction log
        // must be sync'd to the log record for that change and
        // all log records including the commit of this xact must
        // be sync'd before returning.
        // 
        // 2) if the data page is never written then the log record
        // for the commit may never be written, and the xact will
        // never make to disk.  This is ok as no subsequent action
        // depends on this operation being committed.
        // 
        tran.commitNoSync(Transaction.RELEASE_LOCKS);
        return Serviceable.DONE;
    }
}

Example 22 with ContainerHandle

use of org.apache.derby.iapi.store.raw.ContainerHandle in project derby by apache.

the class LogicalPageOperation method reclaimPrepareLocks.

/**
 ************************************************************************
 * Public Methods of RePreparable Interface:
 **************************************************************************
 */
/**
 * reclaim locks associated with the changes in this log record.
 * <p>
 * @param locking_policy  The locking policy to use to claim the locks.
 *
 * @exception  StandardException  Standard exception policy.
 */
public void reclaimPrepareLocks(Transaction t, LockingPolicy locking_policy) throws StandardException {
    if (SanityManager.DEBUG) {
        SanityManager.DEBUG_PRINT("", "reclaimPrepareLocks().");
        SanityManager.ASSERT(getRecordHandle() != null);
    }
    ContainerHandle ch = t.openContainer(getPageId().getContainerId(), locking_policy, (ContainerHandle.MODE_FORUPDATE | ContainerHandle.MODE_OPEN_FOR_LOCK_ONLY | ContainerHandle.MODE_LOCK_NOWAIT));
    if (SanityManager.DEBUG) {
        SanityManager.ASSERT(ch != null);
    }
    if (ch != null)
        ch.close();
    /*
        // get the intent lock on the container.
        boolean lock_granted = 
            locking_policy.lockContainer(
                t, 
                getContainer(), 
                false,          // don't wait for the lock, it is bug if a 
                                // lock has to wait while reclaiming locks 
                                // during recovery.
                true);          // lock for update.

        if (SanityManager.DEBUG)
        {
            SanityManager.ASSERT(lock_granted);
        }
        
        */
    // get the row lock on the c.
    boolean lock_granted = locking_policy.lockRecordForWrite(t, getRecordHandle(), // default is not for insert.
    false, // don't wait for the lock, it is bug if a
    false);
    // lock has to wait while reclaiming locks
    // during recovery.
    releaseResource(t);
    if (SanityManager.DEBUG) {
        SanityManager.ASSERT(lock_granted);
    }
}