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Ignore fsimage entries outside of the INodeSection when parsing XML. #82

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Ignore fsimage entries outside of the INodeSection when parsing XML. #82

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21 changes: 17 additions & 4 deletions dynamometer-blockgen/src/main/java/com/linkedin/dynamometer/blockgenerator/XMLParser.java
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
Expand Down Expand Up @@ -52,6 +53,13 @@ class XMLParser {
* @return {@code BlockInfo}s for any blocks found.
*/
List<BlockInfo> parseLine(String line) throws IOException {
if (currentState == State.DEFAULT) {
if (line.contains("<INodeSection>")) {
transitionTo(State.INODE_SECTION);
} else {
return Collections.emptyList();
}
}
if (line.contains("<inode>")) {
transitionTo(State.INODE);
}
Expand All @@ -78,6 +86,9 @@ List<BlockInfo> parseLine(String line) throws IOException {
blockInfos.add(new BlockInfo(id, gs, size, currentReplication));
}
if (line.contains("</inode>")) {
transitionTo(State.INODE_SECTION);
}
if (line.contains("</INodeSection>")) {
transitionTo(State.DEFAULT);
}
return blockInfos;
Expand Down Expand Up @@ -113,16 +124,18 @@ private static List<String> valuesFromXMLString(String xml, String field) {

private enum State {
DEFAULT,
INODE_SECTION,
INODE,
FILE,
FILE_WITH_REPLICATION;

private final Set<State> allowedTransitions = new HashSet<>();
static {
DEFAULT.addTransitions(DEFAULT, INODE);
INODE.addTransitions(DEFAULT, FILE);
FILE.addTransitions(DEFAULT, FILE_WITH_REPLICATION);
FILE_WITH_REPLICATION.addTransitions(DEFAULT);
DEFAULT.addTransitions(DEFAULT, INODE_SECTION);
INODE_SECTION.addTransitions(DEFAULT, INODE);
INODE.addTransitions(INODE_SECTION, FILE);
FILE.addTransitions(INODE_SECTION, FILE_WITH_REPLICATION);
FILE_WITH_REPLICATION.addTransitions(INODE_SECTION);
}

private void addTransitions(State... nextState) {
Expand Down
22 changes: 21 additions & 1 deletion ...mometer-blockgen/src/test/java/com/linkedin/dynamometer/blockgenerator/TestXMLParser.java
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Expand Up @@ -33,7 +33,8 @@ public void testBlocksFromLine() throws Exception {
"<inode><type>FILE</type>",
"<replication>12</replication>",
"<blocks><block><id>13</id><genstamp>14</genstamp><numBytes>15</numBytes></block>",
"</inode>"
"</inode>",
"</INodeSection>"
};

Map<BlockInfo, Short> expectedBlockCount = new HashMap<>();
Expand All @@ -53,4 +54,23 @@ public void testBlocksFromLine() throws Exception {
assertEquals(expect.getValue(), actualBlockCount.get(expect.getKey()));
}
}

@Test
public void testNonInodeSectionIgnored() throws Exception {
String[] lines = {
"<INodeSection>",
"</INodeSection>",
"<OtherSection>",
"<inode><id>1</id><type>FILE</type><name>fake-file</name><replication>1</replication>",
"<blocks><block><id>2</id><genstamp>1</genstamp><numBytes>1</numBytes></block>",
"</inode>",
"<replication>3</replication>",
"</OtherSection>"
};

XMLParser parser = new XMLParser();
for (String line : lines) {
assertTrue((parser.parseLine(line).isEmpty()));
}
}
}