解决 Net::ZooKeeper找不到动态链接库符号问题
引用Net::ZooKeeper这个包，可能会报这个错误Can't load '/usr/local/lib64/perl5/auto/Net/ZooKeeper/ZooKeeper.so' for module Net::ZooKeeper: /usr/local/lib64/perl5/auto/Net/ZooKeeper/ZooKeeper.so: undefined symbol: ZOO_PERM_CREATE at /usr/lib64/perl5/XSLoader.pm line 70.
at /usr/local/lib64/perl5/Net/ZooKeeper.pm line 109. 查看XSLoader.pm的70行：
70 my $libref = dl_load_file($file, 0) or do {
71 require Carp;
72 Carp::croak("Can't load '$file' for module $module: " . dl_error());
73 }; 实际上是加载ZooKeeper.so这个动态链接库。我们objdump，看看这个缺少的符号到底有没有在这个链接库里面。
$ objdump -x /usr/local/lib64/perl5/auto/Net/ZooKeeper/ZooKeeper.so | grep ZOO
0000000000000000 *UND*0000000000000000 ZOO_PERM_CREATE
0000000000000000 *UND*0000000000000000 ZOO_READ_ACL_UNSAFE
0000000000000000 *UND*0000000000000000 ZOO_PERM_WRITE
0000000000000000 *UND*0000000000000000 ZOO_ASSOCIATING_STATE
0000000000000000 *UND*0000000000000000 ZOO_CREATED_EVENT
0000000000000000 *UND*0000000000000000 ZOO_CONNECTED_STATE
0000000000000000 *UND*0000000000000000 ZOO_AUTH_FAILED_STATE
0000000000000000 *UND*0000000000000000 ZOO_EPHEMERAL
0000000000000000 *UND*0000000000000000 ZOO_SEQUENCE
0000000000000000 *UND*0000000000000000 ZOO_PERM_READ
0000000000000000 *UND*0000000000000000 ZOO_CREATOR_ALL_ACL
0000000000000000 *UND*0000000000000000 ZOO_PERM_ALL
0000000000000000 *UND*0000000000000000 ZOO_DELETED_EVENT
0000000000000000 *UND*0000000000000000 ZOO_OPEN_ACL_UNSAFE
0000000000000000 *UND*0000000000000000 ZOO_PERM_ADMIN
0000000000000000 *UND*0000000000000000 ZOO_CONNECTING_STATE
0000000000000000 *UND*0000000000000000 ZOO_EXPIRED_SESSION_STATE
0000000000000000 *UND*0000000000000000 ZOO_NOTWATCHING_EVENT
0000000000000000 *UND*0000000000000000 ZOO_PERM_DELETE
0000000000000000 *UND*0000000000000000 ZOO_CHANGED_EVENT
0000000000000000 *UND*0000000000000000 ZOO_CHILD_EVENT
0000000000000000 *UND*0000000000000000 ZOO_SESSION_EVENT 标记为UND，说明这是一个外部符号，应该是需要引用其他库，估计是zookeeper库。但是lib包已经加入了LD_LIBRARY_PATH，非常奇怪。
尝试重新编译ZooKeeper.so（源码在zookeeper的contrib/zkperl下），发现发布包是用MakeMaker组织的，首先生成Makefile，获得下面的提示：
$ perl Makefile.PL
Warning (mostly harmless): No library found for -lzookeeper_mt
Generating a Unix-style Makefile
Writing Makefile for Net::ZooKeeper
Writing MYMETA.yml and MYMETA.json 注意第一行的warning，这是解决问题的关键。Most harmless，but harm this time。查看 Makefile.PL的 第31行
31 GetOptions(
32 'zookeeper-include=s' => \@zk_inc_paths,
33 'zookeeper-lib=s' => \@zk_lib_paths
34 ); 可见第二个选项是必须的。
重新编译。
$ perl Makefile.PL --zookeeper-lib=/home/zhangbin/env/lib
Checking if your kit is complete...
Looks good
Generating a Unix-style Makefile
Writing Makefile for Net::ZooKeeper
Writing MYMETA.yml and MYMETA.json 然后make && sudo make install。问题解决。
可能XSLoader没有自动从LD_LIBRARY_PATH寻找可用的库和符号表的机制。
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