public long writeCommit(CommitUpdateCommand cmd, int flags) {
LogCodec codec = new LogCodec(resolver);
synchronized (this) {
try {
long pos = fos.size(); // if we had flushed, this should be equal to channel.position()
if (pos == 0) {
writeLogHeader(codec);
pos = fos.size();
}
codec.init(fos);
codec.writeTag(JavaBinCodec.ARR, 3);
codec.writeInt(UpdateLog.COMMIT | flags); // should just take one byte
codec.writeLong(cmd.getVersion());
codec.writeStr(END_MESSAGE); // ensure these bytes are (almost) last in the file
endRecord(pos);
fos.flush(); // flush since this will be the last record in a log fill
assert fos.size() == channel.size();
return pos;
} catch (IOException e) {
throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, e);
}
}
}
private void checkWriteHeader(LogCodec codec, SolrInputDocument optional) throws IOException {
// Unsynchronized access. We can get away with an unsynchronized access here
// since we will never get a false non-zero when the position is in fact 0.
// rollback() is the only function that can reset to zero, and it blocks updates.
if (fos.size() != 0) return;
synchronized (this) {
if (fos.size() != 0) return; // check again while synchronized
if (optional != null) {
addGlobalStrings(optional.getFieldNames());
}
writeLogHeader(codec);
}
}
public long writeDelete(DeleteUpdateCommand cmd, int flags) {
LogCodec codec = new LogCodec(resolver);
try {
checkWriteHeader(codec, null);
BytesRef br = cmd.getIndexedId();
MemOutputStream out = new MemOutputStream(new byte[20 + br.length]);
codec.init(out);
codec.writeTag(JavaBinCodec.ARR, 3);
codec.writeInt(UpdateLog.DELETE | flags); // should just take one byte
codec.writeLong(cmd.getVersion());
codec.writeByteArray(br.bytes, br.offset, br.length);
synchronized (this) {
long pos = fos.size(); // if we had flushed, this should be equal to channel.position()
assert pos != 0;
out.writeAll(fos);
endRecord(pos);
// fos.flushBuffer(); // flush later
return pos;
}
} catch (IOException e) {
throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, e);
}
}
/**
* takes a snapshot of the current position and number of records for later possible rollback, and
* returns the position
*/
public long snapshot() {
synchronized (this) {
snapshot_size = fos.size();
snapshot_numRecords = numRecords;
return snapshot_size;
}
}
// This could mess with any readers or reverse readers that are open, or anything that might try
// to do a log lookup.
// This should only be used to roll back buffered updates, not actually applied updates.
public void rollback(long pos) throws IOException {
synchronized (this) {
assert snapshot_size == pos;
fos.flush();
raf.setLength(pos);
fos.setWritten(pos);
assert fos.size() == pos;
numRecords = snapshot_numRecords;
}
}
protected void writeLogHeader(LogCodec codec) throws IOException {
long pos = fos.size();
assert pos == 0;
Map header = new LinkedHashMap<String, Object>();
header.put("SOLR_TLOG", 1); // a magic string + version number
header.put("strings", globalStringList);
codec.marshal(header, fos);
endRecord(pos);
}
public long writeData(Object o) {
LogCodec codec = new LogCodec(resolver);
try {
long pos = fos.size(); // if we had flushed, this should be equal to channel.position()
codec.init(fos);
codec.writeVal(o);
return pos;
} catch (IOException e) {
throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, e);
}
}
public boolean endsWithCommit() throws IOException {
long size;
synchronized (this) {
fos.flush();
size = fos.size();
}
// the end of the file should have the end message (added during a commit) plus a 4 byte size
byte[] buf = new byte[END_MESSAGE.length()];
long pos = size - END_MESSAGE.length() - 4;
if (pos < 0) return false;
ChannelFastInputStream is = new ChannelFastInputStream(channel, pos);
is.read(buf);
for (int i = 0; i < buf.length; i++) {
if (buf[i] != END_MESSAGE.charAt(i)) return false;
}
return true;
}
public long write(AddUpdateCommand cmd, int flags) {
LogCodec codec = new LogCodec(resolver);
SolrInputDocument sdoc = cmd.getSolrInputDocument();
try {
checkWriteHeader(codec, sdoc);
// adaptive buffer sizing
int bufSize = lastAddSize; // unsynchronized access of lastAddSize should be fine
bufSize = Math.min(1024 * 1024, bufSize + (bufSize >> 3) + 256);
MemOutputStream out = new MemOutputStream(new byte[bufSize]);
codec.init(out);
codec.writeTag(JavaBinCodec.ARR, 3);
codec.writeInt(UpdateLog.ADD | flags); // should just take one byte
codec.writeLong(cmd.getVersion());
codec.writeSolrInputDocument(cmd.getSolrInputDocument());
lastAddSize = (int) out.size();
synchronized (this) {
long pos = fos.size(); // if we had flushed, this should be equal to channel.position()
assert pos != 0;
/**
* * System.out.println("###writing at " + pos + " fos.size()=" + fos.size() + "
* raf.length()=" + raf.length()); if (pos != fos.size()) { throw new
* RuntimeException("ERROR" + "###writing at " + pos + " fos.size()=" + fos.size() + "
* raf.length()=" + raf.length()); } *
*/
out.writeAll(fos);
endRecord(pos);
// fos.flushBuffer(); // flush later
return pos;
}
} catch (IOException e) {
// TODO: reset our file pointer back to "pos", the start of this record.
throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Error logging add", e);
}
}
public long writeDeleteByQuery(DeleteUpdateCommand cmd, int flags) {
LogCodec codec = new LogCodec(resolver);
try {
checkWriteHeader(codec, null);
MemOutputStream out = new MemOutputStream(new byte[20 + (cmd.query.length())]);
codec.init(out);
codec.writeTag(JavaBinCodec.ARR, 3);
codec.writeInt(UpdateLog.DELETE_BY_QUERY | flags); // should just take one byte
codec.writeLong(cmd.getVersion());
codec.writeStr(cmd.query);
synchronized (this) {
long pos = fos.size(); // if we had flushed, this should be equal to channel.position()
out.writeAll(fos);
endRecord(pos);
// fos.flushBuffer(); // flush later
return pos;
}
} catch (IOException e) {
throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, e);
}
}
/** returns the current position in the log file */
public long position() {
synchronized (this) {
return fos.size();
}
}
protected void endRecord(long startRecordPosition) throws IOException {
fos.writeInt((int) (fos.size() - startRecordPosition));
numRecords++;
}
TransactionLog(File tlogFile, Collection<String> globalStrings, boolean openExisting) {
boolean success = false;
try {
if (debug) {
log.debug(
"New TransactionLog file="
+ tlogFile
+ ", exists="
+ tlogFile.exists()
+ ", size="
+ tlogFile.length()
+ ", openExisting="
+ openExisting);
}
this.tlogFile = tlogFile;
raf = new RandomAccessFile(this.tlogFile, "rw");
long start = raf.length();
channel = raf.getChannel();
os = Channels.newOutputStream(channel);
fos = new FastOutputStream(os, new byte[65536], 0);
// fos = FastOutputStream.wrap(os);
if (openExisting) {
if (start > 0) {
readHeader(null);
raf.seek(start);
assert channel.position() == start;
fos.setWritten(start); // reflect that we aren't starting at the beginning
assert fos.size() == channel.size();
} else {
addGlobalStrings(globalStrings);
}
} else {
if (start > 0) {
log.warn("New transaction log already exists:" + tlogFile + " size=" + raf.length());
return;
}
if (start > 0) {
raf.setLength(0);
}
addGlobalStrings(globalStrings);
}
success = true;
assert ObjectReleaseTracker.track(this);
} catch (IOException e) {
throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, e);
} finally {
if (!success && raf != null) {
try {
raf.close();
} catch (Exception e) {
log.error("Error closing tlog file (after error opening)", e);
}
}
}
}
