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Optimize LineRecordReader (#419) 

* Move locations initialization for file input splits to initialize method
* Little optimization for schema detection regular expression

Signed-off-by: Paul Dubs <paul.dubs@gmail.com>
master
Paul Dubs 2020-04-28 02:38:31 +02:00 committed by GitHub
parent c9d1454743
commit b9d5f1645b
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 13 additions and 9 deletions
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13
datavec/datavec-api/src/main/java/org/datavec/api/records/reader/impl/LineRecordReader.java
View File

@ -60,6 +60,13 @@ public class LineRecordReader extends BaseRecordReader {
@Override
public void initialize(InputSplit split) throws IOException, InterruptedException {
super.initialize(split);
if(!(inputSplit instanceof StringSplit || inputSplit instanceof InputStreamInputSplit)){
final ArrayList<URI> uris = new ArrayList<>();
final Iterator<URI> uriIterator = inputSplit.locationsIterator();
while(uriIterator.hasNext()) uris.add(uriIterator.next());
this.locations = uris.toArray(new URI[0]);
}
this.iter = getIterator(0);
this.initialized = true;
}
@ -68,7 +75,6 @@ public class LineRecordReader extends BaseRecordReader {
public void initialize(Configuration conf, InputSplit split) throws IOException, InterruptedException {
this.conf = conf;
initialize(split);
this.initialized = true;
}
@Override
@ -207,11 +213,6 @@ public class LineRecordReader extends BaseRecordReader {
}
}
} else {
final ArrayList<URI> uris = new ArrayList<>();
final Iterator<URI> uriIterator = inputSplit.locationsIterator();
while(uriIterator.hasNext()) uris.add(uriIterator.next());
this.locations = uris.toArray(new URI[uris.size()]);
if (locations.length > 0) {
InputStream inputStream = streamCreatorFn.apply(locations[location]);
try {

9
datavec/datavec-api/src/main/java/org/datavec/api/util/files/UriFromPathIterator.java
View File

@ -23,6 +23,7 @@ import java.net.URI;
import java.net.URISyntaxException;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.regex.Pattern;
/**
* A simple utility method to convert a {@code Iterator<String>} to an {@code Iterator<URI>}, where each
@ -32,6 +33,7 @@ import java.util.NoSuchElementException;
*/
@AllArgsConstructor
public class UriFromPathIterator implements Iterator<URI> {
final Pattern schemaPattern = Pattern.compile("^.*?:/.*");
private final Iterator<String> paths;
@ -42,16 +44,17 @@ public class UriFromPathIterator implements Iterator<URI> {
@Override
public URI next() {
if (!hasNext()) {
throw new NoSuchElementException("No next element");
}
try {
String s = paths.next();
if(!s.matches(".*:/.*")){
if(schemaPattern.matcher(s).matches()){
return new URI(s);
} else {
//No scheme - assume file for backward compatibility
return new File(s).toURI();
} else {
return new URI(s);
}
} catch (URISyntaxException e) {