BSTIndex index = new BSTIndex(new TajoConf());
BSTIndex.BSTIndexReader idxReader =
index.getIndexReader(new Path(outDir, "index"));
idxReader.open();
Schema keySchema = idxReader.getKeySchema();
TupleComparator comparator = idxReader.getComparator();
LOG.info("BSTIndex is loaded from disk (" + idxReader.getFirstKey() + ", "
+ idxReader.getLastKey());
File data = new File(URI.create(outDir.toUri() + "/output"));
byte [] startBytes = Base64.decodeBase64(startKey);
byte [] endBytes = Base64.decodeBase64(endKey);
Tuple start;
Tuple end;
try {
start = RowStoreUtil.RowStoreDecoder.toTuple(keySchema, startBytes);
} catch (Throwable t) {
throw new IllegalArgumentException("StartKey: " + startKey
+ ", decoded byte size: " + startBytes.length, t);
}
try {
end = RowStoreUtil.RowStoreDecoder.toTuple(keySchema, endBytes);
} catch (Throwable t) {
throw new IllegalArgumentException("EndKey: " + endKey
+ ", decoded byte size: " + endBytes.length, t);
}
if(!comparator.isAscendingFirstKey()) {
Tuple tmpKey = start;
start = end;
end = tmpKey;
}
LOG.info("GET Request for " + data.getAbsolutePath() + " (start="+start+", end="+ end +
(last ? ", last=true" : "") + ")");
if (idxReader.getFirstKey() == null && idxReader.getLastKey() == null) { // if # of rows is zero
LOG.info("There is no contents");
return null;
}
if (comparator.compare(end, idxReader.getFirstKey()) < 0 ||
comparator.compare(idxReader.getLastKey(), start) < 0) {
LOG.info("Out of Scope (indexed data [" + idxReader.getFirstKey() + ", " + idxReader.getLastKey() +
"], but request start:" + start + ", end: " + end);
return null;
}
long startOffset;
long endOffset;
try {
startOffset = idxReader.find(start);
} catch (IOException ioe) {
LOG.error("State Dump (the requested range: "
+ new TupleRange(keySchema, start, end) + ", idx min: "
+ idxReader.getFirstKey() + ", idx max: "
+ idxReader.getLastKey());
throw ioe;
}
try {
endOffset = idxReader.find(end);
if (endOffset == -1) {
endOffset = idxReader.find(end, true);
}
} catch (IOException ioe) {
LOG.error("State Dump (the requested range: "
+ new TupleRange(keySchema, start, end) + ", idx min: "
+ idxReader.getFirstKey() + ", idx max: "
+ idxReader.getLastKey());
throw ioe;
}
// if startOffset == -1 then case 2-1 or case 3
if (startOffset == -1) { // this is a hack
// if case 2-1 or case 3
try {
startOffset = idxReader.find(start, true);
} catch (IOException ioe) {
LOG.error("State Dump (the requested range: "
+ new TupleRange(keySchema, start, end) + ", idx min: "
+ idxReader.getFirstKey() + ", idx max: "
+ idxReader.getLastKey());
throw ioe;
}
}
if (startOffset == -1) {
throw new IllegalStateException("startOffset " + startOffset + " is negative \n" +
"State Dump (the requested range: "
+ new TupleRange(keySchema, start, end) + ", idx min: " + idxReader.getFirstKey() + ", idx max: "
+ idxReader.getLastKey());
}
// if greater than indexed values
if (last || (endOffset == -1
&& comparator.compare(idxReader.getLastKey(), end) < 0)) {
endOffset = data.length();
}
FileChunk chunk = new FileChunk(data, startOffset, endOffset - startOffset);
LOG.info("Retrieve File Chunk: " + chunk);