diff --git a/tools/scripts/asynccache/AsyncCache.proto b/tools/scripts/asynccache/AsyncCache.proto
new file mode 100755
index 0000000..914392e
--- /dev/null
+++ b/tools/scripts/asynccache/AsyncCache.proto
@@ -0,0 +1,31 @@
+// Options for caching a block asynchronously
+// next available id: 6
+message AsyncCacheRequest {
+  optional int64 block_id = 1;
+  // TODO(calvin): source host and port should be replace with WorkerNetAddress
+  optional string source_host = 2;
+  optional int32 source_port = 3;
+  optional OpenUfsBlockOptions open_ufs_block_options = 4;
+  optional int64 length = 5;
+}
+
+// Options to open a UFS block.
+// next available id: 7
+message OpenUfsBlockOptions {
+  optional string ufs_path = 1;
+  // The offset of the block in within the file.
+  optional int64 offset_in_file = 2;
+  // The block size.
+  optional int64 block_size = 3;
+  optional int32 maxUfsReadConcurrency = 4;
+  optional int64 mountId = 5;
+  // If set, do not try to cache the block locally when reading the data from the UFS.
+  optional bool no_cache = 6;
+  // The client does not need to set this. This is set by the worker.
+  optional string user = 7;
+}
+
+message LocalBlockOpenResponse {
+  optional string path = 1;
+}
+
diff --git a/tools/scripts/asynccache/alluxiosc.c b/tools/scripts/asynccache/alluxiosc.c
new file mode 100755
index 0000000..fb49cd8
--- /dev/null
+++ b/tools/scripts/asynccache/alluxiosc.c
@@ -0,0 +1,160 @@
+#define _GNU_SOURCE_
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <dlfcn.h>
+#include <string.h>
+#include <limits.h>
+#include <mntent.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#define MNT_MAX 100
+char *seed = ".tmp.ava.alluxiosc.tmp"; 			// keep same with server
+char *cache_seed = ".tmp.cache.tmp.ava.alluxiosc.tmp"; 	// keep same with server
+
+typedef struct ava_struct {
+  char *mnt_slots[MNT_MAX];
+  int mnt_idx;
+  int debug;
+  int query;
+  int cache;
+} ava_struct;
+
+ava_struct ava;
+
+FILE* (*my_fopen)(const char *filename, const char* mode);
+int  (*my_open)(const char *filename, int flags);
+int  (*my_open64)(const char *filename, int flags);
+ 
+int (*my__xstat)(int ver, const char *path, struct stat *buf);
+int (*my__xstat64)(int ver, const char *path, struct stat64 *buf);
+
+void __attribute__ ((constructor)) init(void){
+  FILE *file= setmntent("/proc/mounts", "r");
+  struct mntent *ent;
+
+  ava.debug = (getenv("alluxiosc_debug") != NULL);
+  ava.query = (getenv("alluxiosc_query") != NULL);
+  ava.cache = (getenv("alluxiosc_cache") != NULL);
+  if (ava.cache) seed = cache_seed;
+  ava.mnt_idx = 0;
+
+  my_fopen = dlsym(RTLD_NEXT, "fopen");
+  my_open = dlsym(RTLD_NEXT, "open");
+  my_open64 = dlsym(RTLD_NEXT, "open64");
+  my__xstat = dlsym(RTLD_NEXT, "__xstat");
+  my__xstat64 = dlsym(RTLD_NEXT, "__xstat64");
+
+  if (file== NULL) {
+    perror("setmntent");
+    return;
+  }
+
+  while (NULL != (ent = getmntent(file))) {
+    if (0 == strcmp("alluxio-fuse", ent->mnt_fsname)) {
+      ava.mnt_slots[ava.mnt_idx++] = strdup(ent->mnt_dir);
+    }
+  }
+  endmntent(file);
+}
+
+int is_alluxio_file(const char *fullpath)
+{
+  for (int i = 0; i < ava.mnt_idx; i++) {
+    char *path = strstr(fullpath, ava.mnt_slots[i]);
+    if (path == fullpath) {
+      return 1;
+    }
+  }
+  return 0;
+}
+
+int get_sc(const char *filename, char *sc, int size, int *af) 
+{
+  char buf[PATH_MAX + 1], *path = NULL;
+  int rc = 0, i = 0;
+  FILE *f = NULL;
+
+  *af = 0;
+  if (NULL == realpath(filename, buf)) return 0;
+  if (!is_alluxio_file(buf)) return 0;
+  *af = 1;
+
+  strcat(buf, seed);
+  
+  if ((f = my_fopen(buf, "r")) && fgets(sc, size, f)) {
+    i = strlen(sc);
+    if (sc[i - 1] == '\n') sc[i - 1] = '\0';
+    rc = ('/' == sc[0]);
+  }
+  if (f) fclose(f);
+  return rc;
+}
+
+int __xstat(int ver, const char *path, struct stat *buf)
+{
+  char full[PATH_MAX + 1];
+  if (ava.query) {
+    char sc[PATH_MAX + 1];
+    int af, rc = get_sc(path, sc, sizeof(sc), &af);
+    printf("query=%s\n", sc);
+    return my__xstat(ver, path, buf);
+  }
+
+  if (NULL == realpath(path, full)) return my__xstat(ver, path, buf);  // error out
+  if (!is_alluxio_file(full)) return my__xstat(ver, path, buf);
+
+  if (ava.debug) fprintf(stderr, "--- async cache %s\n", full);
+  strcat(full, seed);
+  return my__xstat(ver, full, buf);
+}
+
+int __xstat64(int ver, const char *path, struct stat64 *buf)
+{
+  char full[PATH_MAX + 1];
+  if (ava.query) {
+    char sc[PATH_MAX + 1];
+    int af, rc = get_sc(path, sc, sizeof(sc), &af);
+    printf("query=%s\n", sc);
+    return my__xstat64(ver, path, buf);
+  }
+
+  if (NULL == realpath(path, full)) return my__xstat64(ver, path, buf);  // error out
+  if (!is_alluxio_file(full)) return my__xstat64(ver, path, buf);
+
+  if (ava.debug) fprintf(stderr, "--- async cache64 %s\n", full);
+  strcat(full, seed);
+  return my__xstat64(ver, full, buf);
+}
+
+FILE* fopen(const char* filename, const char* mode){
+  char sc[PATH_MAX + 1];
+  memset(sc, 0, sizeof(sc));
+  int af, rc = get_sc(filename, sc, sizeof(sc), &af);
+  if (ava.debug && af) fprintf(stderr, "--- fopen filename=%s, rc=%d, sc=%s\n", filename, rc, sc);
+  FILE *f = rc ? my_fopen(sc, mode) : NULL;
+  return f ? f : my_fopen(filename, mode);
+}
+
+int open(const char *filename, int flags)
+{
+  char sc[PATH_MAX + 1];
+  memset(sc, 0, sizeof(sc));
+  int af, rc = get_sc(filename, sc, sizeof(sc), &af);
+  if (ava.debug && af) fprintf(stderr, "--- open filename=%s, rc=%d, sc=%s\n", filename, rc, sc);
+  int fd = rc ? my_open(sc, flags) : 0;
+  return fd ? fd : my_open(filename, flags);
+}
+
+int open64(const char *filename, int flags)
+{
+  char sc[PATH_MAX + 1];
+  memset(sc, 0, sizeof(sc));
+  int af, rc = get_sc(filename, sc, sizeof(sc), &af);
+  if (ava.debug && af) fprintf(stderr, "--- open64 filename=%s, rc=%d, sc=%s\n", filename, rc, sc);
+  int fd = rc ?  my_open64(sc, flags) : 0; 
+  return fd ? fd : my_open64(filename, flags);
+}
+
diff --git a/tools/scripts/asynccache/ava_cache.py b/tools/scripts/asynccache/ava_cache.py
new file mode 100755
index 0000000..ecc374d
--- /dev/null
+++ b/tools/scripts/asynccache/ava_cache.py
@@ -0,0 +1,81 @@
+#! /usr/bin/python3
+"""
+apt-get update
+apt-get install -y python3-pip
+pip3 install google-apputils
+pip3 install protobuf
+protoc --proto_path=. --python_out=. AsyncCache.proto
+"""
+
+from AsyncCache_pb2 import AsyncCacheRequest, LocalBlockOpenResponse
+import sys
+import socket
+import struct
+import time
+
+if len(sys.argv) != 4:
+    print("Usage:", sys.argv[0], "ip port file_list")
+    sys.exit(-1)
+
+ip = sys.argv[1]
+port = int(sys.argv[2])
+flist = sys.argv[3]
+
+address = (ip, port)
+clientsocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+clientsocket.connect(address)
+
+TH_HI = 100
+TH_LOW = 50
+ID_PURGE_BLOCK = 0
+ID_QUERY_BLOCK = -1
+
+
+def async_cache(id, length):
+    data = AsyncCacheRequest()
+    data.length = length
+    data.block_id = id
+    s = data.SerializeToString()
+    # (long)length - (int)id - (int)packet_length - packet
+    clientsocket.sendall(struct.pack('>QII', 16 + len(s), 112, len(s)) + s)
+
+
+def evict(id):
+    async_cache(id, ID_PURGE_BLOCK)
+
+
+def trim(idlist, low):
+    rsp = LocalBlockOpenResponse()
+    while len(idlist) > low:
+        not_done = []
+        for id in idlist:
+            async_cache(id, ID_QUERY_BLOCK)
+            result = clientsocket.recv(16)
+            if result == b'':
+                raise RuntimeError("socket connection broken")
+            alen, retid, plen = struct.unpack('>QII', result)
+            if retid != 106:
+                raise RuntimeError("not expect id")
+            result = clientsocket.recv(plen)
+            rsp.ParseFromString(result)
+            if rsp.path[0] != '/':
+                print("done ", id)
+            else:
+                not_done.append(id)
+                evict(id)
+        idlist = not_done
+        time.sleep(2)
+    return idlist
+
+
+idlist = []
+with open(flist, "r") as lines:
+    for line in lines:
+        id = int(line.split()[0])
+        if len(idlist) >= TH_HI:
+            idlist = trim(idlist, TH_LOW)
+        print("evicting ", id)
+        evict(id)
+        idlist.append(id)
+
+trim(idlist, 0)
diff --git a/tools/scripts/asynccache/ava_cache.sh b/tools/scripts/asynccache/ava_cache.sh
new file mode 100755
index 0000000..72349e5
--- /dev/null
+++ b/tools/scripts/asynccache/ava_cache.sh
@@ -0,0 +1,66 @@
+#!/bin/bash
+
+if [ $# -lt 2 ]
+then
+  echo usage "$0 <alluxiosc.so path> <list file>"
+  exit -1
+fi
+
+so=$1
+list=$2
+if [ ! -e $so ]
+then
+  echo "so file $so does not exist"
+  exit -1
+fi
+if [ ! -e $list ]
+then
+  echo "list file $list does not exist"
+  exit -1
+fi
+
+MAX=50
+
+cache=()
+trim() {
+  left=()
+  for f in ${cache[@]}
+  do
+    if [ ! -e "$f" ]
+    then
+      echo "remove non existing $f ..."
+      continue
+    fi
+    ok=`alluxiosc_query=1 LD_PRELOAD=$so ls "$f" | grep 'query=/'`
+    if [ -z "$ok" ]
+    then
+      echo "trying to cache again $f ..."
+      left+=("$f")
+      alluxiosc_cache=1 LD_PRELOAD=$so ls "$f" > /dev/null &
+    else
+      echo "done cache $f ..."
+    fi
+  done
+  cache=(${left[@]})
+}
+
+while read line 
+do
+  while [ ${#cache[@]} -gt $MAX ]
+  do
+    sleep 2
+    trim
+  done
+
+  f=`echo $line | awk '{print $1}'`
+  cache+=("$f")
+  echo "trying to cache $f ..."
+  alluxiosc_cache=1 LD_PRELOAD=$so ls "$f" > /dev/null &
+done < $list
+
+while [ ${#cache[@]} -gt 0 ]
+do
+  sleep 1
+  trim
+done
+
diff --git a/tools/scripts/asynccache/mk_alluxiosc.sh b/tools/scripts/asynccache/mk_alluxiosc.sh
new file mode 100755
index 0000000..0547f58
--- /dev/null
+++ b/tools/scripts/asynccache/mk_alluxiosc.sh
@@ -0,0 +1,2 @@
+rm alluxiosc.so
+gcc -D_GNU_SOURCE -fPIC -shared -O2 alluxiosc.c -o alluxiosc.so -ldl