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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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
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package org.apache.cassandra.io.sstable.format.bti;
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.TypeSizes;
import org.apache.cassandra.db.compaction.CompactionInterruptedException;
import org.apache.cassandra.db.lifecycle.LifecycleTransaction;
import org.apache.cassandra.db.marshal.AbstractType;
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.bti.BtiFormat.Components;
import org.apache.cassandra.io.util.FileUtils;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.OutputHandler;
import org.apache.cassandra.utils.Throwables;
public class BtiTableScrubber extends SortedTableScrubber implements IScrubber
{
private final boolean isIndex;
private final AbstractType partitionKeyType;
private ScrubPartitionIterator indexIterator;
public BtiTableScrubber(ColumnFamilyStore cfs,
LifecycleTransaction transaction,
OutputHandler outputHandler,
IScrubber.Options options)
{
super(cfs, transaction, outputHandler, options);
boolean hasIndexFile = sstable.getComponents().contains(Components.PARTITION_INDEX);
this.isIndex = cfs.isIndex();
this.partitionKeyType = cfs.metadata.get().partitionKeyType;
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 index component");
}
try
{
this.indexIterator = hasIndexFile
? openIndexIterator()
: null;
}
catch (RuntimeException ex)
{
outputHandler.warn("Detected corruption in the index file - cannot open index iterator", ex);
}
}
private ScrubPartitionIterator openIndexIterator()
{
try
{
return sstable.scrubPartitionsIterator();
}
catch (Throwable t)
{
outputHandler.warn(t, "Index is unreadable, scrubbing will continue without index.");
}
return null;
}
@Override
protected UnfilteredRowIterator withValidation(UnfilteredRowIterator iter, String filename)
{
return options.checkData && !isIndex ? UnfilteredRowIterators.withValidation(iter, filename) : iter;
}
@Override
public void scrubInternal(SSTableRewriter writer)
{
if (indexAvailable() && indexIterator.dataPosition() != 0)
{
outputHandler.warn("First position reported by index should be 0, was " +
indexIterator.dataPosition() +
", continuing without index.");
indexIterator.close();
indexIterator = null;
}
DecoratedKey prevKey = null;
while (!dataFile.isEOF())
{
if (scrubInfo.isStopRequested())
throw new CompactionInterruptedException(scrubInfo.getCompactionInfo());
// position in a data file where the partition starts
long dataStart = dataFile.getFilePointer();
outputHandler.debug("Reading row at %d", dataStart);
DecoratedKey key = null;
Throwable keyReadError = null;
try
{
ByteBuffer raw = ByteBufferUtil.readWithShortLength(dataFile);
if (!isIndex)
partitionKeyType.validate(raw);
key = sstable.decorateKey(raw);
}
catch (Throwable th)
{
keyReadError = th;
throwIfFatal(th);
// check for null key below
}
// position of the partition in a data file, it points to the beginning of the partition key
long dataStartFromIndex = -1;
// size of the partition (including partition key)
long dataSizeFromIndex = -1;
ByteBuffer currentIndexKey = null;
if (indexAvailable())
{
currentIndexKey = indexIterator.key();
dataStartFromIndex = indexIterator.dataPosition();
if (!indexIterator.isExhausted())
{
try
{
indexIterator.advance();
if (!indexIterator.isExhausted())
dataSizeFromIndex = indexIterator.dataPosition() - dataStartFromIndex;
}
catch (Throwable th)
{
throwIfFatal(th);
outputHandler.warn(th,
"Failed to advance to the next index position. Index is corrupted. " +
"Continuing without the index. Last position read is %d.",
indexIterator.dataPosition());
indexIterator.close();
indexIterator = null;
currentIndexKey = null;
dataStartFromIndex = -1;
dataSizeFromIndex = -1;
}
}
}
String keyName = key == null ? "(unreadable key)" : keyString(key);
outputHandler.debug("partition %s is %s", keyName, FBUtilities.prettyPrintMemory(dataSizeFromIndex));
try
{
if (key == null)
throw new IOError(new IOException("Unable to read partition key from data file", keyReadError));
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))));
}
if (indexIterator != null && dataSizeFromIndex > dataFile.length())
throw new IOError(new IOException("Impossible partition size (greater than file length): " + dataSizeFromIndex));
if (indexIterator != 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))
{
// position where the row should start in a data file (right after the partition key)
long rowStartFromIndex = dataStartFromIndex + TypeSizes.SHORT_SIZE + currentIndexKey.remaining();
outputHandler.output("Retrying from partition index; data is %s bytes starting at %s",
dataSizeFromIndex, rowStartFromIndex);
key = sstable.decorateKey(currentIndexKey);
try
{
if (!isIndex)
partitionKeyType.validate(key.getKey());
dataFile.seek(rowStartFromIndex);
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);
badPartitions++;
if (indexIterator != null)
{
outputHandler.warn("Partition starting at position %d is unreadable; skipping to next", dataStart);
if (!seekToNextPartition())
break;
}
else
{
outputHandler.warn("Unrecoverable error while scrubbing %s." +
"Scrubbing cannot continue. The sstable will be marked for deletion. " +
"You can attempt manual recovery from the pre-scrub snapshot. " +
"You can also run nodetool repair to transfer the data from a healthy replica, if any.",
sstable);
// There's no way to resync and continue. Give up.
break;
}
}
}
}
}
private boolean indexAvailable()
{
return indexIterator != null && !indexIterator.isExhausted();
}
private boolean seekToNextPartition()
{
while (indexAvailable())
{
long nextRowPositionFromIndex = indexIterator.dataPosition();
try
{
dataFile.seek(nextRowPositionFromIndex);
return true;
}
catch (Throwable th)
{
throwIfFatal(th);
outputHandler.warn(th, "Failed to seek to next row position %d", nextRowPositionFromIndex);
badPartitions++;
}
try
{
indexIterator.advance();
}
catch (Throwable th)
{
outputHandler.warn(th, "Failed to go to the next entry in index");
throw Throwables.cleaned(th);
}
}
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(indexIterator);
}
finally
{
fileAccessLock.writeLock().unlock();
}
}
}