Jul 31 06:25:19 localhost kernel: INFO: task java:6498 blocked for more than 120 seconds.google大神告訴我：
Jul 31 06:25:19 localhost kernel: Not tainted 2.6.32-504.el6.x86_64 #1
Jul 31 06:25:19 localhost kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jul 31 06:25:19 localhost kernel: java D 0000000000000000 0 6498 26501 0x00000080
Jul 31 06:25:19 localhost kernel: ffff88003cd6be08 0000000000000082 ffff88003cd6bdc8 ffff88003cd6bdc8
Jul 31 06:25:19 localhost kernel: ffff88003cd6bdc8 ffff88000000070d 0000000000000001 00000009ffffffff
Jul 31 06:25:19 localhost kernel: ffff880000000000 ffffffffa0121e08 ffff88007c99d058 ffff88003cd6bfd8
Jul 31 06:25:19 localhost kernel: Call Trace:
Jul 31 06:25:19 localhost kernel: [<ffffffffa0121e08>] ? ext4_file_write+0x58/0x190 [ext4]
Jul 31 06:25:19 localhost kernel: [<ffffffff81236ba1>] ? file_has_perm+0xd1/0xe0
Jul 31 06:25:19 localhost kernel: [<ffffffff8152cae5>] rwsem_down_failed_common+0x95/0x1d0
Jul 31 06:25:19 localhost kernel: [<ffffffff8152cc43>] rwsem_down_write_failed+0x23/0x30
Jul 31 06:25:19 localhost kernel: [<ffffffff812989f3>] call_rwsem_down_write_failed+0x13/0x20
Jul 31 06:25:19 localhost kernel: [<ffffffff8152c142>] ? down_write+0x32/0x40
Jul 31 06:25:19 localhost kernel: [<ffffffff8114545c>] sys_mmap_pgoff+0x5c/0x2d0
Jul 31 06:25:19 localhost kernel: [<ffffffff81012499>] sys_mmap+0x29/0x30
Jul 31 06:25:19 localhost kernel: [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
reboot，繼續觀察是否解決Make it permanent
When the server seemed more stable and no Kernel/Swap/Memory Panic for a week, I edited/etc/sysctl.conffile to make these permanent after reboot.
someuser@servercore [/home/someuser]$ sudo vi /etc/sysctl.conf
vm.dirty_background_ratio = 5 vm.dirty_ratio = 10
解決辦法：意思就是：
按照告警裡的提示將該提醒disable
echo 0 > /proc/sys/kernel/hung_task_timeout_secs
告知是linux會設置40%的可用內存用來做系統cache，當flush數據時這40%內存中的數據由於和IO同步問題導致超時（120s），所將40%減小到10%，避免超時。
至於那些要修改專案的guid的，可以忽略了
<ProjectTypeGuids>{E3E379DF-F4C6-4180-9B81-6769533ABE47};{349c5851-65df-11da-9384-00065b846f21};{fae04ec0-301f-11d3-bf4b-00c04f79efbc}</ProjectTypeGuids>
public abstract class ServerObject {
protected final static HashMap<String,Thread> threadPoolHashMap=new HashMap<String, Thread>();
protected final static HashMap<String,Object> threadPoolSessionObjectHashMap=new HashMap<String, Object>();
protected Transaction tx;
protected org.hibernate.Session Hibernatesession;
protected void reloadProperty() throws FileNotFoundException, IOException {
Hibernatesession=(Session) threadPoolSessionObjectHashMap.get(Thread.currentThread().getName()+"hibernate-session");
tx= (Transaction) threadPoolSessionObjectHashMap.get(Thread.currentThread().getName()+"hibernate-transaction");
}
}
Hibernatesession = HibernateSessionFactory.getSession();
threadPoolSessionObjectHashMap.put(Thread.currentThread().getName()+"hibernate-session", Hibernatesession);
tx = Hibernatesession.beginTransaction();
threadPoolSessionObjectHashMap.put(Thread.currentThread().getName()+"hibernate-transaction", tx);
yum install zsh
wget https://github.com/robbyrussell/oh-my-zsh/raw/master/tools/install.sh -O - | shvi ~/.zshrc
ZSH_THEME="ys"
plugins=(git textmate ruby autojump osx mvn gradle)
[[ -s /root/.autojump/etc/profile.d/autojump.sh ]] && source /root/.autojump/etc/profile.d/autojump.sh
autoload -U compinit && compinit -u
bindkey -s "^[Op" "0"
bindkey -s "^[On" "."
bindkey -s "^[Oq" "1"
bindkey -s "^[Or" "2"
bindkey -s "^[Os" "3"
bindkey -s "^[Ot" "4"
bindkey -s "^[Ou" "5"
bindkey -s "^[Ov" "6"
bindkey -s "^[Ow" "7"
bindkey -s "^[Ox" "8"
bindkey -s "^[Oy" "9"
bindkey -s "^[Ol" "+"
bindkey -s "^[Om" "-"
for pietty：(not working............)
option-->detail-->
Terminal -> Keyboard"The Function keys and keypad"
