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提交 df0ecfc8 authored 作者: Thomas Mueller's avatar Thomas Mueller
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Page store: simplify overflow format

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h2/src/main/org/h2/index/PageBtreeIndex.java
浏览文件 @ df0ecfc8
......@@ -52,8 +52,7 @@ public class PageBtreeIndex extends PageIndex {
// it should not for new tables, otherwise redo of other operations
// must ensure this page is not used for other things
store.addMeta(this, session);
PageBtreeLeaf root = new PageBtreeLeaf(this, rootPageId, store.createData());
root.parentPageId = PageBtree.ROOT;
PageBtreeLeaf root = PageBtreeLeaf.create(this, rootPageId, PageBtree.ROOT);
store.updateRecord(root, true, root.data);
} else {
rootPageId = store.getRootPageId(id);
......@@ -131,8 +130,7 @@ public class PageBtreeIndex extends PageIndex {
PageBtree getPage(int id) throws SQLException {
PageBtree p = (PageBtree) store.getPage(id);
if (p == null) {
Data data = store.createData();
PageBtreeLeaf empty = new PageBtreeLeaf(this, id, data);
PageBtreeLeaf empty = PageBtreeLeaf.create(this, id, PageBtree.ROOT);
return empty;
}
return p;
......@@ -245,8 +243,7 @@ public class PageBtreeIndex extends PageIndex {
private void removeAllRows() throws SQLException {
PageBtree root = getPage(rootPageId);
root.freeChildren();
root = new PageBtreeLeaf(this, rootPageId, store.createData());
root.parentPageId = PageBtree.ROOT;
root = PageBtreeLeaf.create(this, rootPageId, PageBtree.ROOT);
store.removeRecord(rootPageId);
store.updateRecord(root, true, null);
rowCount = 0;
......
h2/src/main/org/h2/index/PageBtreeLeaf.java
浏览文件 @ df0ecfc8
......@@ -18,21 +18,21 @@ import org.h2.store.Page;
import org.h2.store.PageStore;
/**
* A b-tree leaf page that contains index data.
* Format:
* <ul><li>parent page id (0 for root): int
* </li><li>page type: byte
* </li><li>index id: varInt
* </li><li>entry count: short
* </li><li>list of offsets: short
* </li><li>data (key: varLong, value,...)
* </li></ul>
* A b-tree leaf page that contains index data. Format:
* <ul>
* <li>parent page id (0 for root): int</li>
* <li>page type: byte</li>
* <li>index id: varInt</li>
* <li>entry count: short</li>
* <li>list of offsets: short</li>
* <li>data (key: varLong, value,...)</li>
* </ul>
*/
public class PageBtreeLeaf extends PageBtree {
private static final int OFFSET_LENGTH = 2;
PageBtreeLeaf(PageBtreeIndex index, int pageId, Data data) {
private PageBtreeLeaf(PageBtreeIndex index, int pageId, Data data) {
super(index, pageId, data);
}
......
h2/src/main/org/h2/index/PageBtreeNode.java
浏览文件 @ df0ecfc8
......@@ -19,17 +19,17 @@ import org.h2.store.PageStore;
import org.h2.util.MemoryUtils;
/**
* A b-tree node page that contains index data.
* Format:
* <ul><li>parent page id (0 for root): int
* </li><li>page type: byte
* </li><li>index id: varInt
* </li><li>count of all children (-1 if not known): int
* </li><li>entry count: short
* </li><li>rightmost child page id: int
* </li><li>entries (child page id: int, offset: short)
* The row contains the largest key of the respective child, meaning
* row[0] contains the largest key of child[0].
* A b-tree node page that contains index data. Format:
* <ul>
* <li>parent page id (0 for root): int</li>
* <li>page type: byte</li>
* <li>index id: varInt</li>
* <li>count of all children (-1 if not known): int</li>
* <li>entry count: short</li>
* <li>rightmost child page id: int</li>
* <li>entries (child page id: int, offset: short) The row contains the largest
* key of the respective child, meaning row[0] contains the largest key of
* child[0].
*/
public class PageBtreeNode extends PageBtree {
......@@ -70,7 +70,7 @@ public class PageBtreeNode extends PageBtree {
* @param parentPageId the parent page id
* @return the page
*/
public static PageBtreeNode create(PageBtreeIndex index, int pageId, int parentPageId) {
static PageBtreeNode create(PageBtreeIndex index, int pageId, int parentPageId) {
PageBtreeNode p = new PageBtreeNode(index, pageId, index.getPageStore().createData());
p.parentPageId = parentPageId;
p.writeHead();
......
h2/src/main/org/h2/index/PageDataLeaf.java
浏览文件 @ df0ecfc8
......@@ -19,17 +19,17 @@ import org.h2.store.Page;
import org.h2.store.PageStore;
/**
* A leaf page that contains data of one or multiple rows.
* Format:
* <ul><li>parent page id (0 for root): int
* </li><li>page type: byte
* </li><li>table id: varInt
* </li><li>column count: varInt
* </li><li>entry count: short
* </li><li>with overflow: the first overflow page id: int
* </li><li>list of key / offset pairs (key: varLong, offset: shortInt)
* </li><li>data
* </li></ul>
* A leaf page that contains data of one or multiple rows. Format:
* <ul>
* <li>parent page id (0 for root): int</li>
* <li>page type: byte</li>
* <li>table id: varInt</li>
* <li>column count: varInt</li>
* <li>entry count: short</li>
* <li>with overflow: the first overflow page id: int</li>
* <li>list of key / offset pairs (key: varLong, offset: shortInt)</li>
* <li>data</li>
* </ul>
*/
public class PageDataLeaf extends PageData {
......@@ -223,7 +223,7 @@ public class PageDataLeaf extends PageData {
size = pageSize - PageDataOverflow.START_MORE;
next = index.getPageStore().allocatePage();
}
PageDataOverflow overflow = new PageDataOverflow(index, page, type, previous, next, all, dataOffset, size);
PageDataOverflow overflow = PageDataOverflow.create(index.getPageStore(), page, type, previous, next, all, dataOffset, size);
index.getPageStore().updateRecord(overflow, true, null);
dataOffset += size;
remaining -= size;
......@@ -295,6 +295,7 @@ public class PageDataLeaf extends PageData {
PageDataOverflow page = index.getPageOverflow(next);
next = page.readInto(buff);
} while (next != 0);
int checkRequired;
overflowRowSize = pageSize + buff.length();
buff.setPos(0);
r = index.readRow(buff, columnCount);
......
h2/src/main/org/h2/index/PageDataNode.java
浏览文件 @ df0ecfc8
......@@ -19,18 +19,18 @@ import org.h2.store.PageStore;
import org.h2.util.MemoryUtils;
/**
* A leaf page that contains data of one or multiple rows.
* Format:
* <ul><li>parent page id (0 for root): int
* </li><li>page type: byte
* </li><li>table id: varInt
* </li><li>count of all children (-1 if not known): int
* </li><li>entry count: short
* </li><li>rightmost child page id: int
* </li><li>entries (key: varLong, child page id: int)
* </li></ul>
* The key is the largest key of the respective child, meaning
* key[0] is the largest key of child[0].
* A leaf page that contains data of one or multiple rows. Format:
* <ul>
* <li>parent page id (0 for root): int</li>
* <li>page type: byte</li>
* <li>table id: varInt</li>
* <li>count of all children (-1 if not known): int</li>
* <li>entry count: short</li>
* <li>rightmost child page id: int</li>
* <li>entries (key: varLong, child page id: int)</li>
* </ul>
* The key is the largest key of the respective child, meaning key[0] is the
* largest key of child[0].
*/
public class PageDataNode extends PageData {
......
h2/src/main/org/h2/index/PageDataOverflow.java
浏览文件 @ df0ecfc8
......@@ -16,34 +16,33 @@ import org.h2.store.Page;
import org.h2.store.PageStore;
/**
* Overflow data for a leaf page.
* Format:
* <ul><li>0-3: parent page id (0 for root): int
* </li><li>4-4: page type: byte
* </li><li>5-8: table id: int
* </li><li>9-12: if more data: next overflow page id: int
* </li><li>9-10: else remaining size: short
* </li><li>data
* </li></ul>
* Overflow data for a leaf page. Format:
* <ul>
* <li>parent page id (0 for root): int (0-3)</li>
* <li>page type: byte (4)</li>
* <li>more data: next overflow page id: int (5-8)</li>
* <li>last remaining size: short (5-6)</li>
* <li>data (9-/7-)</li>
* </ul>
*/
public class PageDataOverflow extends Page {
/**
* The start of the data in the last overflow page.
*/
static final int START_LAST = 11;
static final int START_LAST = 7;
/**
* The start of the data in a overflow page that is not the last one.
*/
static final int START_MORE = 13;
static final int START_MORE = 9;
private static final int START_NEXT_OVERFLOW = 9;
private static final int START_NEXT_OVERFLOW = 5;
/**
* The index.
* The page store.
*/
private final PageScanIndex index;
private final PageStore store;
/**
* The page type.
......@@ -53,38 +52,17 @@ public class PageDataOverflow extends Page {
/**
* The parent page (overflow or leaf).
*/
private int parentPage;
private int parentPageId;
/**
* The next overflow page, or 0.
*/
private int nextPage;
/**
* The number of content bytes.
*/
private int size;
private Data data;
PageDataOverflow(PageScanIndex index, int pageId, int type, int previous, int next, Data allData, int offset, int size) {
this.index = index;
setPos(pageId);
this.type = type;
this.parentPage = previous;
this.nextPage = next;
this.size = size;
data = index.getPageStore().createData();
data.writeInt(parentPage);
data.writeByte((byte) type);
data.writeInt(index.getId());
if (type == Page.TYPE_DATA_OVERFLOW) {
data.writeInt(nextPage);
} else {
data.writeShortInt(size);
}
data.write(allData.getBytes(), offset, size);
}
private int start;
private int size;
/**
* Create an object from the given data page.
......@@ -94,8 +72,8 @@ public class PageDataOverflow extends Page {
* @param data the data page
* @param offset the offset
*/
PageDataOverflow(PageScanIndex index, int pageId, Data data) {
this.index = index;
private PageDataOverflow(PageStore store, int pageId, Data data) {
this.store = store;
setPos(pageId);
this.data = data;
}
......@@ -103,39 +81,66 @@ public class PageDataOverflow extends Page {
/**
* Read an overflow page.
*
* @param index the index
* @param store the page store
* @param data the data
* @param pageId the page id
* @return the page
*/
public static Page read(PageScanIndex index, Data data, int pageId) throws SQLException {
PageDataOverflow p = new PageDataOverflow(index, pageId, data);
public static Page read(PageStore store, Data data, int pageId) throws SQLException {
PageDataOverflow p = new PageDataOverflow(store, pageId, data);
p.read();
return p;
}
/**
* Create a new overflow page.
*
* @param store the page store
* @param page the page id
* @param type the page type
* @param parentPageId the parent page id
* @param next the next page or 0
* @param all the data
* @param offset the offset within the data
* @param size the number of bytes
* @return the page
*/
static PageDataOverflow create(PageStore store, int page, int type, int parentPageId, int next, Data all, int offset, int size) {
Data data = store.createData();
PageDataOverflow p = new PageDataOverflow(store, page, data);
data.writeInt(parentPageId);
data.writeByte((byte) type);
if (type == Page.TYPE_DATA_OVERFLOW) {
data.writeInt(next);
} else {
data.writeShortInt(size);
}
p.start = data.length();
data.write(all.getBytes(), offset, size);
p.type = type;
p.parentPageId = parentPageId;
p.nextPage = next;
p.size = size;
return p;
}
/**
* Read the page.
*/
private void read() throws SQLException {
data.reset();
parentPage = data.readInt();
parentPageId = data.readInt();
type = data.readByte();
int indexId = data.readInt();
if (indexId != index.getId()) {
throw Message.getSQLException(ErrorCode.FILE_CORRUPTED_1,
"page:" + getPos() + " expected index:" + index.getId() +
" got:" + indexId + " type:" + type);
}
if (type == (Page.TYPE_DATA_OVERFLOW | Page.FLAG_LAST)) {
size = data.readShortInt();
nextPage = 0;
} else if (type == Page.TYPE_DATA_OVERFLOW) {
size = index.getPageStore().getPageSize() - START_MORE;
nextPage = data.readInt();
size = store.getPageSize() - data.length();
} else {
throw Message.getSQLException(ErrorCode.FILE_CORRUPTED_1, "page:" + getPos() + " type:" + type);
}
start = data.length();
}
/**
......@@ -159,15 +164,33 @@ public class PageDataOverflow extends Page {
}
public int getByteCount(DataPage dummy) {
return index.getPageStore().getPageSize();
return store.getPageSize();
}
private void writeHead() {
data.writeInt(parentPageId);
data.writeByte((byte) type);
}
public void write(DataPage buff) throws SQLException {
index.getPageStore().writePage(getPos(), data);
write();
store.writePage(getPos(), data);
}
private void write() {
data.reset();
writeHead();
if (type == Page.TYPE_DATA_OVERFLOW) {
data.writeInt(nextPage);
} else {
data.writeShortInt(size);
}
}
public String toString() {
return "page[" + getPos() + "] data leaf overflow parent:" + parentPage + " next:" + nextPage;
return "page[" + getPos() + "] data leaf overflow parent:" + parentPageId + " next:" + nextPage;
}
/**
......@@ -177,29 +200,27 @@ public class PageDataOverflow extends Page {
*/
public int getMemorySize() {
// double the byte array size
return index.getPageStore().getPageSize() >> 1;
return store.getPageSize() >> 1;
}
void setParentPageId(int parent) {
this.parentPage = parent;
this.parentPageId = parent;
}
public void moveTo(Session session, int newPos) throws SQLException {
PageStore store = index.getPageStore();
int start = type == Page.TYPE_DATA_OVERFLOW ? START_MORE : START_LAST;
PageDataOverflow p2 = new PageDataOverflow(index, newPos, type, parentPage, nextPage, data, start, size);
PageDataOverflow p2 = PageDataOverflow.create(store, newPos, type, parentPageId, nextPage, data, start, size);
store.updateRecord(p2, false, null);
if (nextPage != 0) {
PageDataOverflow p3 = (PageDataOverflow) store.getPage(nextPage);
p3.setParentPageId(newPos);
}
Page p = store.getPage(parentPage);
Page p = store.getPage(parentPageId);
if (p == null) {
throw Message.throwInternalError();
}
if (p instanceof PageDataOverflow) {
PageDataOverflow p1 = (PageDataOverflow) p;
p1.setOverflow(newPos);
p1.setNext(newPos);
} else {
PageDataLeaf p1 = (PageDataLeaf) p;
p1.setOverflow(newPos);
......@@ -207,10 +228,10 @@ public class PageDataOverflow extends Page {
store.freePage(getPos(), true, data);
}
private void setOverflow(int nextPage) throws SQLException {
private void setNext(int nextPage) throws SQLException {
this.nextPage = nextPage;
data.setInt(START_NEXT_OVERFLOW, nextPage);
index.getPageStore().updateRecord(this, true, data);
store.updateRecord(this, true, data);
}
}
h2/src/main/org/h2/store/PageFreeList.java
浏览文件 @ df0ecfc8
......@@ -15,9 +15,9 @@ import org.h2.util.BitField;
* The list of free pages of a page store. The format of a free list trunk page
* is:
* <ul>
* <li>0-3: parent page id (always 0)</li>
* <li>4-4: page type</li>
* <li>5-remainder: data</li>
* <li>parent page id (always 0): int</li>
* <li>page type: byte</li>
* <li>data (5-)</li>
* </ul>
*/
public class PageFreeList extends Page {
......
h2/src/main/org/h2/store/PageStore.java
浏览文件 @ df0ecfc8
......@@ -79,15 +79,15 @@ import org.h2.value.ValueString;
*/
public class PageStore implements CacheWriter {
// TODO delete: only log the key
// TODO fix page format of ..
// TODO log: use varInt / varLong
// TODO update: only log the key and changed values
// TODO fix page format of data overflow and so on
// TODO implement checksum; 0 for empty pages
// TODO undo log: fully compress empty pages
// TODO undo log: (option) fully compress empty pages
// TODO undo log: don't store empty space between head and data
// TODO undo log: lzf compression
// TODO long primary keys don't use delegating index yet (setPos(): int)
// TODO replace CRC32
// TODO maybe remove parent pointer
// TODO index creation: use less space (ordered, split at insertion point)
// TODO test running out of disk space (using a special file system)
......@@ -467,12 +467,7 @@ public class PageStore implements CacheWriter {
break;
}
case Page.TYPE_DATA_OVERFLOW: {
int indexId = data.readInt();
PageScanIndex index = (PageScanIndex) metaObjects.get(indexId);
if (index == null) {
Message.throwInternalError("index not found " + indexId);
}
p = PageDataOverflow.read(index, data, pageId);
p = PageDataOverflow.read(this, data, pageId);
break;
}
case Page.TYPE_BTREE_LEAF: {
......
h2/src/main/org/h2/store/PageStreamData.java
浏览文件 @ df0ecfc8
......@@ -12,10 +12,10 @@ import org.h2.engine.Session;
/**
* A data page of a stream. The format is:
* <ul>
* <li>0-3: the trunk page id</li>
* <li>4-4: page type</li>
* <li>5-8: the number of bytes used</li>
* <li>9-remainder: data</li>
* <li>the trunk page id: int (0-3)</li>
* <li>page type: byte (4)</li>
* <li>the number of bytes used: short (5-6)</li>
* <li>data (9-)</li>
* </ul>
*/
public class PageStreamData extends Page {
......
h2/src/main/org/h2/store/PageStreamTrunk.java
浏览文件 @ df0ecfc8
......@@ -10,19 +10,19 @@ import java.sql.SQLException;
import org.h2.engine.Session;
/**
* A trunk page of a stream. It contains the page numbers of the stream, and
* the page number of the next trunk. The format is:
* A trunk page of a stream. It contains the page numbers of the stream, and the
* page number of the next trunk. The format is:
* <ul>
* <li>0-3: the last trunk page, or 0 if none</li>
* <li>4-4: page type</li>
* <li>5-8: the next trunk page</li>
* <li>9-12: the number of pages</li>
* <li>13-remainder: page ids</li>
* <li>previous trunk page, or 0 if none: int (0-3)</li>
* <li>page type: byte (4)</li>
* <li>next trunk page: int (5-8)</li>
* <li>number of pages (9-10)</li>
* <li>remainder: page ids (11-)</li>
* </ul>
*/
public class PageStreamTrunk extends Page {
private static final int DATA_START = 13;
private static final int DATA_START = 11;
private final PageStore store;
private int parent;
......@@ -83,7 +83,7 @@ public class PageStreamTrunk extends Page {
parent = data.readInt();
data.readByte();
nextTrunk = data.readInt();
pageCount = data.readInt();
pageCount = data.readShortInt();
pageIds = new int[pageCount];
for (int i = 0; i < pageCount; i++) {
pageIds[i] = data.readInt();
......@@ -121,7 +121,7 @@ public class PageStreamTrunk extends Page {
data.writeInt(parent);
data.writeByte((byte) Page.TYPE_STREAM_TRUNK);
data.writeInt(nextTrunk);
data.writeInt(pageCount);
data.writeShortInt(pageCount);
for (int i = 0; i < pageCount; i++) {
data.writeInt(pageIds[i]);
}
......
h2/src/main/org/h2/tools/Recover.java
浏览文件 @ df0ecfc8
......@@ -1201,7 +1201,6 @@ public class Recover extends Tool implements DataHandler {
store.readFully(s2.getBytes(), 0, pageSize);
s2.setPos(4);
int type = s2.readByte();
int indexId = s2.readInt();
if (type == (Page.TYPE_DATA_OVERFLOW | Page.FLAG_LAST)) {
int size = s2.readShortInt();
writer.println("-- chain: " + next + " type: " + type + " size: " + size);
......
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