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https://issues.apache.org/jira/browse/AMQ-5578 

Add additional preallocation strategy [CHUNKED contributed by user
jtahlborn.
This commit is contained in:
Timothy Bish 2016-03-03 17:34:07 -05:00
parent be4ad3d1c8
commit edfc23ee9d
1 changed files with 33 additions and 4 deletions
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37
activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/disk/journal/Journal.java
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@ -62,6 +62,8 @@ public class Journal {
private static final int MAX_BATCH_SIZE = 32*1024*1024;
private static final int PREALLOC_CHUNK_SIZE = 1 << 20;
// ITEM_HEAD_SPACE = length + type+ reserved space + SOR
public static final int RECORD_HEAD_SPACE = 4 + 1;
@ -69,10 +71,10 @@ public class Journal {
public static final byte BATCH_CONTROL_RECORD_TYPE = 2;
// Batch Control Item holds a 4 byte size of the batch and a 8 byte checksum of the batch.
public static final byte[] BATCH_CONTROL_RECORD_MAGIC = bytes("WRITE BATCH");
public static final int BATCH_CONTROL_RECORD_SIZE = RECORD_HEAD_SPACE+BATCH_CONTROL_RECORD_MAGIC.length+4+8;
public static final int BATCH_CONTROL_RECORD_SIZE = RECORD_HEAD_SPACE + BATCH_CONTROL_RECORD_MAGIC.length + 4 + 8;
public static final byte[] BATCH_CONTROL_RECORD_HEADER = createBatchControlRecordHeader();
// tackle corruption when checksum is disabled or corrupt with zeros, minimise data loss
// tackle corruption when checksum is disabled or corrupt with zeros, minimize data loss
public void corruptRecoveryLocation(Location recoveryPosition) throws IOException {
DataFile dataFile = getDataFile(recoveryPosition);
// with corruption on recovery we have no faith in the content - slip to the next batch record or eof
@ -87,7 +89,6 @@ public class Journal {
recoveryPosition.setSize(-1);
dataFile.corruptedBlocks.add(sequence);
} catch (IOException e) {
} finally {
accessorPool.closeDataFileAccessor(reader);
@ -97,7 +98,8 @@ public class Journal {
public enum PreallocationStrategy {
SPARSE_FILE,
OS_KERNEL_COPY,
ZEROS;
ZEROS,
CHUNKED_ZEROS;
}
public enum PreallocationScope {
@ -256,6 +258,8 @@ public class Journal {
doPreallocationKernelCopy(file);
} else if (PreallocationStrategy.ZEROS == preallocationStrategy) {
doPreallocationZeros(file);
} else if (PreallocationStrategy.CHUNKED_ZEROS == preallocationStrategy) {
doPreallocationChunkedZeros(file);
} else {
doPreallocationSparseFile(file);
}
@ -321,6 +325,31 @@ public class Journal {
return rc;
}
private void doPreallocationChunkedZeros(RecoverableRandomAccessFile file) {
ByteBuffer buffer = ByteBuffer.allocate(PREALLOC_CHUNK_SIZE);
buffer.position(0);
buffer.limit(PREALLOC_CHUNK_SIZE);
try {
FileChannel channel = file.getChannel();
int remLen = maxFileLength;
while (remLen > 0) {
if (remLen < buffer.remaining()) {
buffer.limit(remLen);
}
int writeLen = channel.write(buffer);
remLen -= writeLen;
buffer.rewind();
}
channel.force(false);
channel.position(0);
} catch (IOException e) {
LOG.error("Could not preallocate journal file with zeros! Will continue without preallocation", e);
}
}
private static byte[] bytes(String string) {
try {
return string.getBytes("UTF-8");