@Override
public void init(
ExecMapperContext context,
MapredContext mrContext,
Configuration hconf,
MapJoinOperator joinOp) {
this.tezContext = (TezContext) mrContext;
this.hconf = hconf;
this.desc = joinOp.getConf();
}
private void output(Serializable work) {
if (work == null) return;
// Check if work has an explain annotation
Annotation note = work.getClass().getAnnotation(Explain.class);
// if (note == null) return;
if (note instanceof Explain) {
Explain xpl_note = (Explain) note;
out.println(xpl_note.displayName());
}
out.println(work.getClass());
// If this is an operator then we need to call the plan generation on conf and then the children
if (work instanceof Operator) {
/** explain only in Driver #execute optimize(generate alias map) in Driver #compile */
if (work instanceof MapJoinOperator) {
// map join tables
MapJoinOperator c = (MapJoinOperator) work;
// out.println("Join" + (c.getColumnExprMap()));
// out.println(c.get);
// desc not contains useful infos
MapJoinDesc desc = c.getConf();
// out.println(desc.getKeyTableDesc());
// out.println(desc.getKeys()); //0 1
// out.println(desc.getRetainList());
out.println(desc.getExprs());
// out.println(desc.getAliasBucketFileNameMapping()); null
// out.println(desc.getBigTableBucketNumMapping()); {}
// out.println(desc.getBigTablePartSpecToFileMapping()); null
// List<TableDesc> descs = desc.getValueTblDescs();
// for (TableDesc d : descs) {
// out.println(d.getJobProperties());
// }
// + " alias map " + ((CommonJoinOperator)work).getPosToAliasMap());
}
// conf is the table info
Operator<? extends OperatorDesc> operator = (Operator<? extends OperatorDesc>) work;
if (operator.getConf() != null) {
String appender = " (" + operator.getOperatorId() + ")";
out.println(appender);
}
if (!visitedOps.contains(operator)) {
visitedOps.add(operator);
if (operator.getChildOperators() != null) {
for (Operator<? extends OperatorDesc> op : operator.getChildOperators()) {
output(op);
}
}
}
return;
}
// We look at all methods that generate values for explain
Method[] methods = work.getClass().getMethods();
for (Method m : methods) {
note = m.getAnnotation(Explain.class);
if (note instanceof Explain) {
Explain xpl_note = (Explain) note;
if (xpl_note.normalExplain()) {
Object val = null;
try {
val = m.invoke(work);
} catch (Exception e) {
// TODO Auto-generated catch block
val = null;
}
if (val == null) {
continue;
}
String header = null;
boolean skipHeader = xpl_note.skipHeader();
// boolean emptyHeader = false;
// Try the output as a primitive object
if (isPrintable(val)) {
if (out != null && shouldPrint(xpl_note, val)) {
if (!skipHeader) {
out.printf("%s ", header);
}
out.println(val);
}
continue;
}
// Try this as a map
try {
// Go through the map and print out the stuff
Map<?, ?> mp = (Map<?, ?>) val;
if (out != null && !skipHeader && mp != null && !mp.isEmpty()) {
out.print(header);
}
continue;
} catch (ClassCastException ce) {
// Ignore - all this means is that this is not a map
}
// Try this as a list
try {
List<?> l = (List<?>) val;
if (out != null && !skipHeader && l != null && !l.isEmpty()) {
out.print(header);
}
continue;
} catch (ClassCastException ce) {
// Ignore
}
// Finally check if it is serializable
try {
Serializable s = (Serializable) val;
if (!skipHeader && out != null) {
out.println(header);
}
continue;
} catch (ClassCastException ce) {
// Ignore
}
}
}
}
}