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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hbase.wal;
import static org.apache.hadoop.hbase.wal.WALSplitUtil.getCompletedRecoveredEditsFilePath;
import static org.apache.hadoop.hbase.wal.WALSplitUtil.getRegionSplitEditsPath;
import java.io.EOFException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.log.HBaseMarkers;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.ipc.RemoteException;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hbase.thirdparty.org.apache.commons.collections4.MapUtils;
@InterfaceAudience.Private
abstract class AbstractRecoveredEditsOutputSink extends OutputSink {
private static final Logger LOG = LoggerFactory.getLogger(RecoveredEditsOutputSink.class);
private final WALSplitter walSplitter;
private final ConcurrentMap regionMaximumEditLogSeqNum = new ConcurrentHashMap<>();
public AbstractRecoveredEditsOutputSink(WALSplitter walSplitter,
WALSplitter.PipelineController controller, EntryBuffers entryBuffers, int numWriters) {
super(controller, entryBuffers, numWriters);
this.walSplitter = walSplitter;
}
/**
* @return a writer that wraps a {@link WALProvider.Writer} and its Path. Caller should close.
*/
protected RecoveredEditsWriter createRecoveredEditsWriter(TableName tableName, byte[] region,
long seqId) throws IOException {
Path regionEditsPath = getRegionSplitEditsPath(tableName, region, seqId,
walSplitter.getFileBeingSplit().getPath().getName(), walSplitter.getTmpDirName(),
walSplitter.conf);
if (walSplitter.walFS.exists(regionEditsPath)) {
LOG.warn("Found old edits file. It could be the " +
"result of a previous failed split attempt. Deleting " + regionEditsPath + ", length=" +
walSplitter.walFS.getFileStatus(regionEditsPath).getLen());
if (!walSplitter.walFS.delete(regionEditsPath, false)) {
LOG.warn("Failed delete of old {}", regionEditsPath);
}
}
WALProvider.Writer w = walSplitter.createWriter(regionEditsPath);
final String msg = "Creating recovered edits writer path=" + regionEditsPath;
LOG.info(msg);
updateStatusWithMsg(msg);
return new RecoveredEditsWriter(region, regionEditsPath, w, seqId);
}
protected Path closeRecoveredEditsWriter(RecoveredEditsWriter editsWriter,
List thrown) throws IOException {
try {
editsWriter.writer.close();
} catch (IOException ioe) {
final String errorMsg = "Could not close recovered edits at " + editsWriter.path;
LOG.error(errorMsg, ioe);
updateStatusWithMsg(errorMsg);
thrown.add(ioe);
return null;
}
final String msg = "Closed recovered edits writer path=" + editsWriter.path + " (wrote "
+ editsWriter.editsWritten + " edits, skipped " + editsWriter.editsSkipped + " edits in " + (
editsWriter.nanosSpent / 1000 / 1000) + " ms)";
LOG.info(msg);
updateStatusWithMsg(msg);
if (editsWriter.editsWritten == 0) {
// just remove the empty recovered.edits file
if (walSplitter.walFS.exists(editsWriter.path)
&& !walSplitter.walFS.delete(editsWriter.path, false)) {
final String errorMsg = "Failed deleting empty " + editsWriter.path;
LOG.warn(errorMsg);
updateStatusWithMsg(errorMsg);
throw new IOException("Failed deleting empty " + editsWriter.path);
}
return null;
}
Path dst = getCompletedRecoveredEditsFilePath(editsWriter.path,
regionMaximumEditLogSeqNum.get(Bytes.toString(editsWriter.encodedRegionName)));
try {
if (!dst.equals(editsWriter.path) && walSplitter.walFS.exists(dst)) {
deleteOneWithFewerEntries(editsWriter, dst);
}
// Skip the unit tests which create a splitter that reads and
// writes the data without touching disk.
// TestHLogSplit#testThreading is an example.
if (walSplitter.walFS.exists(editsWriter.path)) {
if (!walSplitter.walFS.rename(editsWriter.path, dst)) {
final String errorMsg =
"Failed renaming recovered edits " + editsWriter.path + " to " + dst;
updateStatusWithMsg(errorMsg);
throw new IOException(errorMsg);
}
final String renameEditMsg = "Rename recovered edits " + editsWriter.path + " to " + dst;
LOG.info(renameEditMsg);
updateStatusWithMsg(renameEditMsg);
}
} catch (IOException ioe) {
final String errorMsg = "Could not rename recovered edits " + editsWriter.path
+ " to " + dst;
LOG.error(errorMsg, ioe);
updateStatusWithMsg(errorMsg);
thrown.add(ioe);
return null;
}
return dst;
}
@Override
public boolean keepRegionEvent(WAL.Entry entry) {
ArrayList cells = entry.getEdit().getCells();
for (Cell cell : cells) {
if (WALEdit.isCompactionMarker(cell)) {
return true;
}
}
return false;
}
/**
* Update region's maximum edit log SeqNum.
*/
void updateRegionMaximumEditLogSeqNum(WAL.Entry entry) {
synchronized (regionMaximumEditLogSeqNum) {
String regionName = Bytes.toString(entry.getKey().getEncodedRegionName());
Long currentMaxSeqNum = regionMaximumEditLogSeqNum.get(regionName);
if (currentMaxSeqNum == null || entry.getKey().getSequenceId() > currentMaxSeqNum) {
regionMaximumEditLogSeqNum.put(regionName, entry.getKey().getSequenceId());
}
}
}
// delete the one with fewer wal entries
private void deleteOneWithFewerEntries(RecoveredEditsWriter editsWriter, Path dst)
throws IOException {
long dstMinLogSeqNum = -1L;
try (WAL.Reader reader = walSplitter.getWalFactory().createReader(walSplitter.walFS, dst)) {
WAL.Entry entry = reader.next();
if (entry != null) {
dstMinLogSeqNum = entry.getKey().getSequenceId();
}
} catch (EOFException e) {
LOG.debug("Got EOF when reading first WAL entry from {}, an empty or broken WAL file?", dst,
e);
}
if (editsWriter.minLogSeqNum < dstMinLogSeqNum) {
LOG.warn("Found existing old edits file. It could be the result of a previous failed" +
" split attempt or we have duplicated wal entries. Deleting " + dst + ", length=" +
walSplitter.walFS.getFileStatus(dst).getLen());
if (!walSplitter.walFS.delete(dst, false)) {
LOG.warn("Failed deleting of old {}", dst);
throw new IOException("Failed deleting of old " + dst);
}
} else {
LOG.warn(
"Found existing old edits file and we have less entries. Deleting " + editsWriter.path +
", length=" + walSplitter.walFS.getFileStatus(editsWriter.path).getLen());
if (!walSplitter.walFS.delete(editsWriter.path, false)) {
LOG.warn("Failed deleting of {}", editsWriter.path);
throw new IOException("Failed deleting of " + editsWriter.path);
}
}
}
/**
* Private data structure that wraps a {@link WALProvider.Writer} and its Path, also collecting
* statistics about the data written to this output.
*/
final class RecoveredEditsWriter {
/* Count of edits written to this path */
long editsWritten = 0;
/* Count of edits skipped to this path */
long editsSkipped = 0;
/* Number of nanos spent writing to this log */
long nanosSpent = 0;
final byte[] encodedRegionName;
final Path path;
final WALProvider.Writer writer;
final long minLogSeqNum;
RecoveredEditsWriter(byte[] encodedRegionName, Path path, WALProvider.Writer writer,
long minLogSeqNum) {
this.encodedRegionName = encodedRegionName;
this.path = path;
this.writer = writer;
this.minLogSeqNum = minLogSeqNum;
}
private void incrementEdits(int edits) {
editsWritten += edits;
}
private void incrementSkippedEdits(int skipped) {
editsSkipped += skipped;
totalSkippedEdits.addAndGet(skipped);
}
private void incrementNanoTime(long nanos) {
nanosSpent += nanos;
}
void writeRegionEntries(List entries) throws IOException {
long startTime = System.nanoTime();
int editsCount = 0;
for (WAL.Entry logEntry : entries) {
filterCellByStore(logEntry);
if (!logEntry.getEdit().isEmpty()) {
try {
writer.append(logEntry);
} catch (IOException e) {
logAndThrowWriterAppendFailure(logEntry, e);
}
updateRegionMaximumEditLogSeqNum(logEntry);
editsCount++;
} else {
incrementSkippedEdits(1);
}
}
// Pass along summary statistics
incrementEdits(editsCount);
incrementNanoTime(System.nanoTime() - startTime);
}
private void logAndThrowWriterAppendFailure(WAL.Entry logEntry, IOException e)
throws IOException {
e = e instanceof RemoteException ? ((RemoteException) e).unwrapRemoteException() : e;
final String errorMsg = "Failed to write log entry " + logEntry.toString() + " to log";
LOG.error(HBaseMarkers.FATAL, errorMsg, e);
updateStatusWithMsg(errorMsg);
throw e;
}
private void filterCellByStore(WAL.Entry logEntry) {
Map maxSeqIdInStores = walSplitter.getRegionMaxSeqIdInStores()
.get(Bytes.toString(logEntry.getKey().getEncodedRegionName()));
if (MapUtils.isEmpty(maxSeqIdInStores)) {
return;
}
// Create the array list for the cells that aren't filtered.
// We make the assumption that most cells will be kept.
ArrayList| keptCells = new ArrayList<>(logEntry.getEdit().getCells().size());
for (Cell cell : logEntry.getEdit().getCells()) {
if (WALEdit.isMetaEditFamily(cell)) {
keptCells.add(cell);
} else {
byte[] family = CellUtil.cloneFamily(cell);
Long maxSeqId = maxSeqIdInStores.get(family);
// Do not skip cell even if maxSeqId is null. Maybe we are in a rolling upgrade,
// or the master was crashed before and we can not get the information.
if (maxSeqId == null || maxSeqId.longValue() < logEntry.getKey().getSequenceId()) {
keptCells.add(cell);
}
}
}
// Anything in the keptCells array list is still live.
// So rather than removing the cells from the array list
// which would be an O(n^2) operation, we just replace the list
logEntry.getEdit().setCells(keptCells);
}
}
}
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