查找hive-0.12.0的filesystem问题的btrace的类。[HIVE-4501](https://issues.apache.org/jira/browse/HIVE-4501)

filesystem-cache-find-bug.btrace.java

package com.github.winse.btrace;

/* BTrace Script Template */
import static com.sun.btrace.BTraceUtils.jstack;
import static com.sun.btrace.BTraceUtils.name;
import static com.sun.btrace.BTraceUtils.print;
import static com.sun.btrace.BTraceUtils.printArray;
import static com.sun.btrace.BTraceUtils.println;
import static com.sun.btrace.BTraceUtils.probeClass;
import static com.sun.btrace.BTraceUtils.probeMethod;
import static com.sun.btrace.BTraceUtils.str;
import static com.sun.btrace.BTraceUtils.strcat;
import static com.sun.btrace.BTraceUtils.timeMillis;

import java.net.URI;

import com.sun.btrace.AnyType;
import com.sun.btrace.annotations.BTrace;
import com.sun.btrace.annotations.Kind;
import com.sun.btrace.annotations.Location;
import com.sun.btrace.annotations.OnMethod;
import com.sun.btrace.annotations.ProbeClassName;
import com.sun.btrace.annotations.ProbeMethodName;
import com.sun.btrace.annotations.Self;
import com.sun.btrace.annotations.TLS;

@BTrace
public class TracingFileSystemCache {

    // donot use $, regex
    private final static String CLAZZ = "/org.apache.hadoop.fs.FileSystem.Cache/";
    private final static String METHOD = "/getInternal/";
    private final static int LINE = 2467;

    // *******************************************
    // Exec time
    // ****************
/*
    @TLS
    private static long startTime = 0;

    @OnMethod(clazz = CLAZZ, method = METHOD)
    public static void startMethod() {
	startTime = timeMillis();
    }

    @OnMethod(clazz = CLAZZ, method = METHOD, location = @Location(Kind.RETURN))
    public static void endMethod() {
	println("监控指定函数耗时->");
	print(strcat(strcat(name(probeClass()), "."), probeMethod()));
	print(" [");
	print(strcat("Time token : ", str(timeMillis() - startTime)));
	println("]");
    }
*/
    // *******************************************
    // Line Info
    // ****************

    /**
     * 行所在的方法名
     */
    @OnMethod(clazz = CLAZZ, location = @Location(value = Kind.LINE, line = LINE))
    public static void online(@ProbeClassName String pcn, @ProbeMethodName String pmn, int line) {
	println("");
	print("invoke at method ->");
	print(strcat(pcn, "."));
	print(strcat(pmn, ":"));
	println(line);
	println("");
    }

    @OnMethod(clazz = CLAZZ, location = @Location(value = Kind.LINE, line = LINE))
    public static void printStack(@ProbeClassName String pcn, @ProbeMethodName String pmn, int line) {
	println("");
	println("jstack: ");
	jstack();
	println("");
    }

    // *******************************************
    // Parameters Info
    // ****************

    @OnMethod(clazz = CLAZZ, method = METHOD)
    public static void func(@ProbeClassName String pcn, @ProbeMethodName String pmn, AnyType[] args) {
	println("");
	print("parameters ->");
	print(pcn);
	print(".");
	print(pmn);
	println("");
	// printArray(args);
	println(str(args[0])); 
	println(str(args[1]));
	println(str(args[2]));
	println("");
    }
/*
    @OnMethod(clazz = CLAZZ, method = METHOD)
    public static void onNewFileInputStream(@Self Object self, URI uri, Configuration conf, Object key) {
	print(key.toString());
    }
*/
}

handle.sh

jps -m

bin/btrace 14915 TracingFileSystemCache.java  > fs.log

grep 'org.apache.hadoop.fs.FileSystem$Cache$Key' fs.log  | sort -u | wc -l