BigTableScrubber.java
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* distributed with this work for additional information
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* to you under the Apache License, Version 2.0 (the
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*
* http://www.apache.org/licenses/LICENSE-2.0
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* distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.cassandra.io.sstable.format.big;
import java.io.IOError;
import java.io.IOException;
import java.nio.ByteBuffer;
import org.apache.cassandra.db.ColumnFamilyStore;
import org.apache.cassandra.db.DecoratedKey;
import org.apache.cassandra.db.compaction.CompactionInterruptedException;
import org.apache.cassandra.db.lifecycle.LifecycleTransaction;
import org.apache.cassandra.db.rows.UnfilteredRowIterator;
import org.apache.cassandra.db.rows.UnfilteredRowIterators;
import org.apache.cassandra.io.sstable.IScrubber;
import org.apache.cassandra.io.sstable.SSTableRewriter;
import org.apache.cassandra.io.sstable.format.SortedTableScrubber;
import org.apache.cassandra.io.sstable.format.big.BigFormat.Components;
import org.apache.cassandra.io.util.FileUtils;
import org.apache.cassandra.io.util.RandomAccessReader;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.JVMStabilityInspector;
import org.apache.cassandra.utils.OutputHandler;
public class BigTableScrubber extends SortedTableScrubber<BigTableReader> implements IScrubber
{
private final boolean isIndex;
private final RandomAccessReader indexFile;
private final RowIndexEntry.IndexSerializer rowIndexEntrySerializer;
private ByteBuffer currentIndexKey;
private ByteBuffer nextIndexKey;
private long currentPartitionPositionFromIndex;
private long nextPartitionPositionFromIndex;
public BigTableScrubber(ColumnFamilyStore cfs,
LifecycleTransaction transaction,
OutputHandler outputHandler,
Options options)
{
super(cfs, transaction, outputHandler, options);
this.rowIndexEntrySerializer = new RowIndexEntry.Serializer(sstable.descriptor.version, sstable.header, cfs.getMetrics());
boolean hasIndexFile = sstable.descriptor.fileFor(Components.PRIMARY_INDEX).exists();
this.isIndex = cfs.isIndex();
if (!hasIndexFile)
{
// if there's any corruption in the -Data.db then partitions can't be skipped over. but it's worth a shot.
outputHandler.warn("Missing component: %s", sstable.descriptor.fileFor(Components.PRIMARY_INDEX));
}
this.indexFile = hasIndexFile
? RandomAccessReader.open(sstable.descriptor.fileFor(Components.PRIMARY_INDEX))
: null;
this.currentPartitionPositionFromIndex = 0;
this.nextPartitionPositionFromIndex = 0;
}
@Override
protected UnfilteredRowIterator withValidation(UnfilteredRowIterator iter, String filename)
{
return options.checkData && !isIndex ? UnfilteredRowIterators.withValidation(iter, filename) : iter;
}
@Override
protected void scrubInternal(SSTableRewriter writer) throws IOException
{
try
{
nextIndexKey = indexAvailable() ? ByteBufferUtil.readWithShortLength(indexFile) : null;
if (indexAvailable())
{
// throw away variable, so we don't have a side effect in the assertion
long firstRowPositionFromIndex = rowIndexEntrySerializer.deserializePositionAndSkip(indexFile);
assert firstRowPositionFromIndex == 0 : firstRowPositionFromIndex;
}
}
catch (Throwable ex)
{
throwIfFatal(ex);
nextIndexKey = null;
nextPartitionPositionFromIndex = dataFile.length();
if (indexFile != null)
indexFile.seek(indexFile.length());
}
DecoratedKey prevKey = null;
while (!dataFile.isEOF())
{
if (scrubInfo.isStopRequested())
throw new CompactionInterruptedException(scrubInfo.getCompactionInfo());
long partitionStart = dataFile.getFilePointer();
outputHandler.debug("Reading row at %d", partitionStart);
DecoratedKey key = null;
try
{
ByteBuffer raw = ByteBufferUtil.readWithShortLength(dataFile);
if (!cfs.metadata.getLocal().isIndex())
cfs.metadata.getLocal().partitionKeyType.validate(raw);
key = sstable.decorateKey(raw);
}
catch (Throwable th)
{
throwIfFatal(th);
// check for null key below
}
long dataStartFromIndex = -1;
long dataSizeFromIndex = -1;
updateIndexKey();
if (indexAvailable())
{
if (currentIndexKey != null)
{
dataStartFromIndex = currentPartitionPositionFromIndex + 2 + currentIndexKey.remaining();
dataSizeFromIndex = nextPartitionPositionFromIndex - dataStartFromIndex;
}
}
long dataStart = dataFile.getFilePointer();
String keyName = key == null ? "(unreadable key)" : keyString(key);
outputHandler.debug("partition %s is %s", keyName, FBUtilities.prettyPrintMemory(dataSizeFromIndex));
assert currentIndexKey != null || !indexAvailable();
try
{
if (key == null)
throw new IOError(new IOException("Unable to read partition key from data file"));
if (currentIndexKey != null && !key.getKey().equals(currentIndexKey))
{
throw new IOError(new IOException(String.format("Key from data file (%s) does not match key from index file (%s)",
//ByteBufferUtil.bytesToHex(key.getKey()), ByteBufferUtil.bytesToHex(currentIndexKey))));
"_too big_", ByteBufferUtil.bytesToHex(currentIndexKey))));
}
if (indexFile != null && dataSizeFromIndex > dataFile.length())
throw new IOError(new IOException("Impossible partition size (greater than file length): " + dataSizeFromIndex));
if (indexFile != null && dataStart != dataStartFromIndex)
outputHandler.warn("Data file partition position %d differs from index file row position %d", dataStart, dataStartFromIndex);
if (tryAppend(prevKey, key, writer))
prevKey = key;
}
catch (Throwable th)
{
throwIfFatal(th);
outputHandler.warn(th, "Error reading partition %s (stacktrace follows):", keyName);
if (currentIndexKey != null
&& (key == null || !key.getKey().equals(currentIndexKey) || dataStart != dataStartFromIndex))
{
outputHandler.output("Retrying from partition index; data is %s bytes starting at %s",
dataSizeFromIndex, dataStartFromIndex);
key = sstable.decorateKey(currentIndexKey);
try
{
if (!cfs.metadata.getLocal().isIndex())
cfs.metadata.getLocal().partitionKeyType.validate(key.getKey());
dataFile.seek(dataStartFromIndex);
if (tryAppend(prevKey, key, writer))
prevKey = key;
}
catch (Throwable th2)
{
throwIfFatal(th2);
throwIfCannotContinue(key, th2);
outputHandler.warn(th2, "Retry failed too. Skipping to next partition (retry's stacktrace follows)");
badPartitions++;
if (!seekToNextPartition())
break;
}
}
else
{
throwIfCannotContinue(key, th);
outputHandler.warn("Partition starting at position %d is unreadable; skipping to next", dataStart);
badPartitions++;
if (currentIndexKey != null)
if (!seekToNextPartition())
break;
}
}
}
}
private void updateIndexKey()
{
currentIndexKey = nextIndexKey;
currentPartitionPositionFromIndex = nextPartitionPositionFromIndex;
try
{
nextIndexKey = !indexAvailable() ? null : ByteBufferUtil.readWithShortLength(indexFile);
nextPartitionPositionFromIndex = !indexAvailable()
? dataFile.length()
: rowIndexEntrySerializer.deserializePositionAndSkip(indexFile);
}
catch (Throwable th)
{
JVMStabilityInspector.inspectThrowable(th);
outputHandler.warn(th, "Error reading index file");
nextIndexKey = null;
nextPartitionPositionFromIndex = dataFile.length();
}
}
private boolean indexAvailable()
{
return indexFile != null && !indexFile.isEOF();
}
private boolean seekToNextPartition()
{
while (nextPartitionPositionFromIndex < dataFile.length())
{
try
{
dataFile.seek(nextPartitionPositionFromIndex);
return true;
}
catch (Throwable th)
{
throwIfFatal(th);
outputHandler.warn(th, "Failed to seek to next partition position %d", nextPartitionPositionFromIndex);
badPartitions++;
}
updateIndexKey();
}
return false;
}
@Override
protected void throwIfCannotContinue(DecoratedKey key, Throwable th)
{
if (isIndex)
{
outputHandler.warn("An error occurred while scrubbing the partition with key '%s' for an index table. " +
"Scrubbing will abort for this table and the index will be rebuilt.", keyString(key));
throw new IOError(th);
}
super.throwIfCannotContinue(key, th);
}
@Override
public void close()
{
fileAccessLock.writeLock().lock();
try
{
FileUtils.closeQuietly(dataFile);
FileUtils.closeQuietly(indexFile);
}
finally
{
fileAccessLock.writeLock().unlock();
}
}
}