Examples with InitNewPageRecord org.apache.ignite.internal.pagemem.wal.record.delta.InitNewPageRecord used on opensource projects

Example 1 with InitNewPageRecord

use of org.apache.ignite.internal.pagemem.wal.record.delta.InitNewPageRecord in project ignite by apache.

the class PagesList method takeEmptyPage.

/**
     * @param bucket Bucket index.
     * @param initIoVers Optional IO to initialize page.
     * @return Removed page ID.
     * @throws IgniteCheckedException If failed.
     */
protected final long takeEmptyPage(int bucket, @Nullable IOVersions initIoVers) throws IgniteCheckedException {
    for (int lockAttempt = 0; ; ) {
        Stripe stripe = getPageForTake(bucket);
        if (stripe == null)
            return 0L;
        final long tailId = stripe.tailId;
        final long tailPage = acquirePage(tailId);
        try {
            // Explicit check.
            long tailAddr = writeLockPage(tailId, tailPage, bucket, lockAttempt++);
            if (tailAddr == 0L) {
                if (isReuseBucket(bucket) && lockAttempt == TRY_LOCK_ATTEMPTS)
                    addStripeForReuseBucket(bucket);
                continue;
            }
            if (stripe.empty) {
                // Another thread took the last page.
                writeUnlock(tailId, tailPage, tailAddr, false);
                if (bucketsSize[bucket].get() > 0) {
                    // Ignore current attempt.
                    lockAttempt--;
                    continue;
                } else
                    return 0L;
            }
            assert PageIO.getPageId(tailAddr) == tailId : "tailId = " + tailId + ", tailPageId = " + PageIO.getPageId(tailAddr);
            assert PageIO.getType(tailAddr) == PageIO.T_PAGE_LIST_NODE;
            boolean dirty = false;
            long dataPageId;
            long recycleId = 0L;
            try {
                PagesListNodeIO io = PagesListNodeIO.VERSIONS.forPage(tailAddr);
                if (io.getNextId(tailAddr) != 0) {
                    // It is not a tail anymore, retry.
                    continue;
                }
                long pageId = io.takeAnyPage(tailAddr);
                if (pageId != 0L) {
                    bucketsSize[bucket].decrementAndGet();
                    if (needWalDeltaRecord(tailId, tailPage, null))
                        wal.log(new PagesListRemovePageRecord(cacheId, tailId, pageId));
                    dirty = true;
                    dataPageId = pageId;
                    if (io.isEmpty(tailAddr)) {
                        long prevId = io.getPreviousId(tailAddr);
                        // to prevent empty page leak to data pages.
                        if (!isReuseBucket(bucket)) {
                            if (prevId != 0L) {
                                Boolean ok = write(prevId, cutTail, null, bucket, FALSE);
                                assert ok == TRUE : ok;
                                recycleId = recyclePage(tailId, tailPage, tailAddr, null);
                            } else
                                stripe.empty = true;
                        } else
                            stripe.empty = prevId == 0L;
                    }
                } else {
                    // a previous page, so, the current page can be collected
                    assert isReuseBucket(bucket);
                    long prevId = io.getPreviousId(tailAddr);
                    assert prevId != 0L;
                    Boolean ok = write(prevId, cutTail, bucket, FALSE);
                    assert ok == TRUE : ok;
                    bucketsSize[bucket].decrementAndGet();
                    if (initIoVers != null) {
                        dataPageId = PageIdUtils.changeType(tailId, FLAG_DATA);
                        PageIO initIo = initIoVers.latest();
                        initIo.initNewPage(tailAddr, dataPageId, pageSize());
                        if (needWalDeltaRecord(tailId, tailPage, null)) {
                            wal.log(new InitNewPageRecord(cacheId, tailId, initIo.getType(), initIo.getVersion(), dataPageId));
                        }
                    } else
                        dataPageId = recyclePage(tailId, tailPage, tailAddr, null);
                    dirty = true;
                }
            // If we do not have a previous page (we are at head), then we still can return
            // current page but we have to drop the whole stripe. Since it is a reuse bucket,
            // we will not do that, but just return 0L, because this may produce contention on
            // meta page.
            } finally {
                writeUnlock(tailId, tailPage, tailAddr, dirty);
            }
            // Put recycled page (if any) to the reuse bucket after tail is unlocked.
            if (recycleId != 0L) {
                assert !isReuseBucket(bucket);
                reuseList.addForRecycle(new SingletonReuseBag(recycleId));
            }
            return dataPageId;
        } finally {
            releasePage(tailId, tailPage);
        }
    }
}