mysqldumpslow報錯：Died at /usr/local/mysql/bin/mysqldumpslow line 161, <> chunk 236.

總結：是因為top數目太多了，mysqldumpslow遍歷不過來的緣故。

/usr/local/mysql/bin/mysqldumpslow -s r -t 15 /root/db01-102-slow.log

1，把r去掉試試，還是報錯，引數不識別。

[root@slave ]# /usr/local/mysql/bin/mysqldumpslow -s -t 15 /root/db01-102-slow.log 

Reading mysql slow query log from 15 /root/db01-102-slow.log
Can't open 15: 沒有那個檔案或目錄 at /usr/local/mysql/bin/mysqldumpslow line 91.
Count: 22  Time=9.61s (211s)  Lock=0.00s (0s)  Rows=1.0 (22), [dubbo]@2hosts
  select count(*)
  from coupon_lot
  left join coupon 
  on coupon.coupon_lot_id = coupon_lot.coupon_lot_id
  LEFT JOIN brand
  ON brand.brand_id=coupon_lot.brand_id
  LEFT JOIN product_category
  on product_category.category_id=coupon_lot.category_id

Count: 177  Time=1.40s (247s)  Lock=0.00s (0s)  Rows=1.0 (177), [dubbo]@2hosts
  select count(*) from user_info
  LEFT JOIN system_region a
  ON province_id =a.region_id
  LEFT JOIN system_region b
  ON city_id = b.region_id
  LEFT JOIN system_region c
  ON district_id = c.region_id

Count: 22  Time=13.20s (290s)  Lock=0.00s (0s)  Rows=10.0 (220), [dubbo]@2hosts
  select 
  coupon_id, coupon_lot.coupon_lot_id, coupon_lot.remark,
  coupon.code,  coupon_lot.coupon_type, coupon.state,
  coupon_lot.ckey, coupon_lot.cvalue, coupon_lot.discount, coupon_lot.type, coupon_lot.channel, 
  coupon_lot.is_reusable, coupon_lot.start_datetime,
  coupon_lot.end_datetime, coupon_lot.create_datetime, coupon.update_datetime ,coupon_lot.department,
  coupon_lot.state as couponLotState, coupon_lot.create_operator,coupon_lot.coupon_category,
  coupon_lot.pdt_code,brand.brand_name,product_category.category_name
  from coupon_lot
  left join coupon 
  on coupon.coupon_lot_id = coupon_lot.coupon_lot_id
  LEFT JOIN brand
  ON brand.brand_id=coupon_lot.brand_id
  LEFT JOIN product_category
  on product_category.category_id=coupon_lot.category_id
  group by coupon_lot.coupon_lot_id
  order by coupon_lot.create_datetime DESC
  limit N,N

Count: 8  Time=1.09s (8s)  Lock=0.00s (0s)  Rows=10.0 (80), [dubbo]@2hosts
  select 
  return_sn,  relating_order_sn, return_from,  oi.order_out_sn ,
  add_time , return_type, 
  return_pay, ui.usename as userName, return_consignee, return_goods_count ,
  return_total_fee, total_paid, 
  return_desc, return_order_status,  return_pay_status ,
  return_shipping_status, order_return.lock_operator, order_return.return_invoice_no
  from order_return  LEFT JOIN   order_info oi
  on order_return.relating_order_sn = oi.order_sn 
  left join user_info ui on oi.user_id = ui.user_id
  left join order_payment on order_payment.order_sn = oi.order_sn
  order by order_return.add_time DESC
  limit N,N

Count: 1  Time=1.00s (1s)  Lock=0.00s (0s)  Rows=1.0 (1), root[root]@localhost
  select sleep(N)

Count: 1  Time=1.13s (1s)  Lock=0.00s (0s)  Rows=10.0 (10), [dubbo]@[xx]
  select 
  return_sn,  relating_order_sn, return_from,  oi.order_out_sn ,
  add_time , return_type, 
  return_pay, ui.usename as userName, return_consignee, return_goods_count ,
  return_total_fee, total_paid, 
  return_desc, return_order_status,  return_pay_status ,
  return_shipping_status, order_return.lock_operator, order_return.return_invoice_no
  from order_return  LEFT JOIN   order_info oi
  on order_return.relating_order_sn = oi.order_sn 
  left join user_info ui on oi.user_id = ui.user_id
  left join order_payment on order_payment.order_sn = oi.order_sn
  order by order_return.add_time DESC
  , oi.order_sn 
  limit N,N

Count: 5  Time=2.47s (12s)  Lock=0.00s (0s)  Rows=0.0 (0), [dubbo]@2hosts
  select
  user_id, usename, nickname, password, user_group_id, realname, gender, email, mobilephone, 
  birthday, province_id, city_id, district_id, marry, income, remarks, create_datetime, 
  active_state, verityEmail, verityPhone, credit, last_login, last_ip, is_locked, channel, 
  tag, union_partner_uuid, union_user_safekey, is_black, qq, weibo_id, verity_email_key, 
  verity_phone_key, verity_email_datetime, verity_phone_datetime, verity_question, 
  verity_answer, cps_code, cps_time_from, cps_time_to, cps_cookie, first_channel
  from user_info where mobilephone = 'S' and (channel is null or trim(channel) ='S')

2，檢視下mysqldumpslow 使用引數，-s後面需要帶引數的，看了西夏at比較合適

[root@db-master-2 ~]# /usr/local/mysql/bin/mysqldumpslow  --help
Usage: mysqldumpslow [ OPTS... ] [ LOGS... ]

Parse and summarize the MySQL slow query log. Options are

  --verbose    verbose
  --debug      debug
  --help       write this text to standard output

  -v           verbose
  -d           debug
  -s ORDER     what to sort by (al, at, ar, c, l, r, t), 'at' is default
                al: average lock time
                ar: average rows sent
                at: average query time
                 c: count
                 l: lock time
                 r: rows sent
                 t: query time  
  -r           reverse the sort order (largest last instead of first)
  -t NUM       just show the top n queries
  -a           don't abstract all numbers to N and strings to 'S'
  -n NUM       abstract numbers with at least n digits within names
  -g PATTERN   grep: only consider stmts that include this string
  -h HOSTNAME  hostname of db server for *-slow.log filename (can be wildcard),
               default is '*', i.e. match all
  -i NAME      name of server instance (if using mysql.server startup script)
  -l           don't subtract lock time from total time

3，在mysqldumpslow的-s後面加入 at引數試試：
[root@slave ]# /usr/local/mysql/bin/mysqldumpslow -s at -t 15 /root/db01-102-slow.log

[root@db-master-2 ~]# /usr/local/mysql/bin/mysqldumpslow -s at -t 15 /root/db01-102-slow.log 
Reading mysql slow query log from /root/db01-102-slow.log
Count: 22  Time=13.20s (290s)  Lock=0.00s (0s)  Rows=10.0 (220), [dubbo]@2hosts
  select 
  coupon_id, coupon_lot.coupon_lot_id, coupon_lot.remark,
  coupon.code,  coupon_lot.coupon_type, coupon.state,
  coupon_lot.ckey, coupon_lot.cvalue, coupon_lot.discount, coupon_lot.type, coupon_lot.channel, 
  coupon_lot.is_reusable, coupon_lot.start_datetime,
  coupon_lot.end_datetime, coupon_lot.create_datetime, coupon.update_datetime ,coupon_lot.department,
  coupon_lot.state as couponLotState, coupon_lot.create_operator,coupon_lot.coupon_category,
  coupon_lot.pdt_code,brand.brand_name,product_category.category_name
  from coupon_lot
  left join coupon 
  on coupon.coupon_lot_id = coupon_lot.coupon_lot_id
  LEFT JOIN brand
  ON brand.brand_id=coupon_lot.brand_id
  LEFT JOIN product_category
  on product_category.category_id=coupon_lot.category_id
  group by coupon_lot.coupon_lot_id
  order by coupon_lot.create_datetime DESC
  limit N,N

Count: 22  Time=9.61s (211s)  Lock=0.00s (0s)  Rows=1.0 (22), [dubbo]@2hosts
  select count(*)
  from coupon_lot
  left join coupon 
  on coupon.coupon_lot_id = coupon_lot.coupon_lot_id
  LEFT JOIN brand
  ON brand.brand_id=coupon_lot.brand_id
  LEFT JOIN product_category
  on product_category.category_id=coupon_lot.category_id

Count: 5  Time=2.47s (12s)  Lock=0.00s (0s)  Rows=0.0 (0), [dubbo]@2hosts
  select
  user_id, usename, nickname, password, user_group_id, realname, gender, email, mobilephone, 
  birthday, province_id, city_id, district_id, marry, income, remarks, create_datetime, 
  active_state, verityEmail, verityPhone, credit, last_login, last_ip, is_locked, channel, 
  tag, union_partner_uuid, union_user_safekey, is_black, qq, weibo_id, verity_email_key, 
  verity_phone_key, verity_email_datetime, verity_phone_datetime, verity_question, 
  verity_answer, cps_code, cps_time_from, cps_time_to, cps_cookie, first_channel
  from user_info where mobilephone = 'S' and (channel is null or trim(channel) ='S')

Count: 177  Time=1.40s (247s)  Lock=0.00s (0s)  Rows=1.0 (177), [dubbo]@2hosts
  select count(*) from user_info
  LEFT JOIN system_region a
  ON province_id =a.region_id
  LEFT JOIN system_region b
  ON city_id = b.region_id
  LEFT JOIN system_region c
  ON district_id = c.region_id

Count: 1  Time=1.13s (1s)  Lock=0.00s (0s)  Rows=10.0 (10), [dubbo]@[10.10.3.8]
  select 
  return_sn,  relating_order_sn, return_from,  oi.order_out_sn ,
  add_time , return_type, 
  return_pay, ui.usename as userName, return_consignee, return_goods_count ,
  return_total_fee, total_paid, 
  return_desc, return_order_status,  return_pay_status ,
  return_shipping_status, order_return.lock_operator, order_return.return_invoice_no
  from order_return  LEFT JOIN   order_info oi
  on order_return.relating_order_sn = oi.order_sn 
  left join user_info ui on oi.user_id = ui.user_id
  left join order_payment on order_payment.order_sn = oi.order_sn
  order by order_return.add_time DESC
  , oi.order_sn 
  limit N,N

Count: 8  Time=1.09s (8s)  Lock=0.00s (0s)  Rows=10.0 (80), [dubbo]@2hosts
  select 
  return_sn,  relating_order_sn, return_from,  oi.order_out_sn ,
  add_time , return_type, 
  return_pay, ui.usename as userName, return_consignee, return_goods_count ,
  return_total_fee, total_paid, 
  return_desc, return_order_status,  return_pay_status ,
  return_shipping_status, order_return.lock_operator, order_return.return_invoice_no
  from order_return  LEFT JOIN   order_info oi
  on order_return.relating_order_sn = oi.order_sn 
  left join user_info ui on oi.user_id = ui.user_id
  left join order_payment on order_payment.order_sn = oi.order_sn
  order by order_return.add_time DESC
  limit N,N

Count: 1  Time=1.00s (1s)  Lock=0.00s (0s)  Rows=1.0 (1), root[root]@localhost
  select sleep(N)

Died at /usr/local/mysql/bin/mysqldumpslow line 161, <> chunk 236.

看到後面還是報錯：Died at /usr/local/mysql/bin/mysqldumpslow line 161, <> chunk 236.

4，去看看/usr/local/mysql/bin/mysqldumpslow的第161行左右，到底是在操作什麼指令碼。

156 my @sorted = sort { $stmt{$b}->{$opt{s}} <=> $stmt{$a}->{$opt{s}} } keys %stmt;
157 @sorted = @sorted[0 .. $opt{t}-1] if $opt{t};
158 @sorted = reverse @sorted         if $opt{r};
159 
160 foreach (@sorted) {
161     my $v = $stmt{$_} || die;
162     my ($c, $t,$at, $l,$al, $r,$ar) = @{ $v }{qw(c t at l al r ar)};
163     my @users = keys %{$v->{users}};
164     my $user  = (@users==1) ? $users[0] : sprintf "%dusers",scalar @users;
165     my @hosts = keys %{$v->{hosts}};
166     my $host  = (@hosts==1) ? $hosts[0] : sprintf "%dhosts",scalar @hosts;
167     printf "Count: %d  Time=%.2fs (%ds)  Lock=%.2fs (%ds)  Rows=%.1f (%d), $user\@$host\n%s\n\n",
168             $c, $at,$t, $al,$l, $ar,$r, $_;
169 }
170 
171 sub usage {
172     my $str= shift;

看到主要是foreach (@sorted)遍歷函式，也就是遍歷到chunk 236的時候就died結束了，沒有辦法往下繼續foreach了。因為以前寫過程式碼，知道報錯所在的這一行

 my $v = $stmt{$_} || die;

是遍歷第一句，那麼肯定是賦值語句，報錯Died，chunk 236肯定是已經遍歷到末尾沒有資料了，看這個函式沒有判斷傳入的引數是否為null的邏輯，所以當檔案資料已經遍歷完，但是命令還沒有結束，所以繼續遍歷，遍歷null的時候報錯，所以程式中止了，解決辦法就是做個限制不要遍歷超過原始資料的字串長度。那麼我們再來看執行的命令:

/usr/local/mysql/bin/mysqldumpslow -s at -t 15 /root/db01-102-slow.log 有 -t 15這一句，那麼就是要顯示出前15個記錄，那麼如果我的slow.log統計出來只有12個不到15個，而這裡有繼續遍歷到15的話，那程式肯定會Died。

所以這裡有2個解決方案：

1 修改/usr/local/mysql/bin/mysqldumpslow裡面的原始碼，加null判斷。

這個過程有些複雜，暫時略過吧，期待後續空了再研究。

2 修改命令 /usr/local/mysql/bin/mysqldumpslow -s at -t 15 /root/db01-102-slow.log ，把-t 15修改成-t 10或者-t 5試試。

試了好幾次，發現臨界點在-t 7上面，如下：

[root@slave~]# /usr/local/mysql/bin/mysqldumpslow -s at -t 8 /root/db01-102-slow.log 
Reading mysql slow query log from /root/db01-102-slow.log
Count: 22  Time=13.20s (290s)  Lock=0.00s (0s)  Rows=10.0 (220), [dubbo]@2hosts
  select 
  coupon_id, coupon_lot.coupon_lot_id, coupon_lot.remark,
  coupon.code,  coupon_lot.coupon_type, coupon.state,
  coupon_lot.ckey, coupon_lot.cvalue, coupon_lot.discount, coupon_lot.type, coupon_lot.channel, 
  coupon_lot.is_reusable, coupon_lot.start_datetime,
  coupon_lot.end_datetime, coupon_lot.create_datetime, coupon.update_datetime ,coupon_lot.department,
  coupon_lot.state as couponLotState, coupon_lot.create_operator,coupon_lot.coupon_category,
  coupon_lot.pdt_code,brand.brand_name,product_category.category_name
  from coupon_lot
  left join coupon 
  on coupon.coupon_lot_id = coupon_lot.coupon_lot_id
  LEFT JOIN brand
  ON brand.brand_id=coupon_lot.brand_id
  LEFT JOIN product_category
  on product_category.category_id=coupon_lot.category_id
  group by coupon_lot.coupon_lot_id
  order by coupon_lot.create_datetime DESC
  limit N,N

Count: 22  Time=9.61s (211s)  Lock=0.00s (0s)  Rows=1.0 (22), [dubbo]@2hosts
  select count(*)
  from coupon_lot
  left join coupon 
  on coupon.coupon_lot_id = coupon_lot.coupon_lot_id
  LEFT JOIN brand
  ON brand.brand_id=coupon_lot.brand_id
  LEFT JOIN product_category
  on product_category.category_id=coupon_lot.category_id

Count: 5  Time=2.47s (12s)  Lock=0.00s (0s)  Rows=0.0 (0), [dubbo]@2hosts
  select
  user_id, usename, nickname, password, user_group_id, realname, gender, email, mobilephone, 
  birthday, province_id, city_id, district_id, marry, income, remarks, create_datetime, 
  active_state, verityEmail, verityPhone, credit, last_login, last_ip, is_locked, channel, 
  tag, union_partner_uuid, union_user_safekey, is_black, qq, weibo_id, verity_email_key, 
  verity_phone_key, verity_email_datetime, verity_phone_datetime, verity_question, 
  verity_answer, cps_code, cps_time_from, cps_time_to, cps_cookie, first_channel
  from user_info where mobilephone = 'S' and (channel is null or trim(channel) ='S')

Count: 177  Time=1.40s (247s)  Lock=0.00s (0s)  Rows=1.0 (177), [xx]@2hosts
  select count(*) from user_info
  LEFT JOIN system_region a
  ON province_id =a.region_id
  LEFT JOIN system_region b
  ON city_id = b.region_id
  LEFT JOIN system_region c
  ON district_id = c.region_id

Count: 1  Time=1.13s (1s)  Lock=0.00s (0s)  Rows=10.0 (10), [xx]@[xxx]
  select 
  return_sn,  relating_order_sn, return_from,  oi.order_out_sn ,
  add_time , return_type, 
  return_pay, ui.usename as userName, return_consignee, return_goods_count ,
  return_total_fee, total_paid, 
  return_desc, return_order_status,  return_pay_status ,
  return_shipping_status, order_return.lock_operator, order_return.return_invoice_no
  from order_return  LEFT JOIN   order_info oi
  on order_return.relating_order_sn = oi.order_sn 
  left join user_info ui on oi.user_id = ui.user_id
  left join order_payment on order_payment.order_sn = oi.order_sn
  order by order_return.add_time DESC
  , oi.order_sn 
  limit N,N

Count: 8  Time=1.09s (8s)  Lock=0.00s (0s)  Rows=10.0 (80), [xx]@2hosts
  select 
  return_sn,  relating_order_sn, return_from,  oi.order_out_sn ,
  add_time , return_type, 
  return_pay, ui.usename as userName, return_consignee, return_goods_count ,
  return_total_fee, total_paid, 
  return_desc, return_order_status,  return_pay_status ,
  return_shipping_status, order_return.lock_operator, order_return.return_invoice_no
  from order_return  LEFT JOIN   order_info oi
  on order_return.relating_order_sn = oi.order_sn 
  left join user_info ui on oi.user_id = ui.user_id
  left join order_payment on order_payment.order_sn = oi.order_sn
  order by order_return.add_time DESC
  limit N,N

Count: 1  Time=1.00s (1s)  Lock=0.00s (0s)  Rows=1.0 (1), root[root]@localhost
  select sleep(N)

Died at /usr/local/mysql/bin/mysqldumpslow line 161, <> chunk 236.

-- 臨界點 -t 7
[root@db-master-2 ~]# /usr/local/mysql/bin/mysqldumpslow -s at -t 7 /root/db01-102-slow.log 

Reading mysql slow query log from /root/db01-102-slow.log
Count: 22  Time=13.20s (290s)  Lock=0.00s (0s)  Rows=10.0 (220), [xx]@2hosts
  select 
  coupon_id, coupon_lot.coupon_lot_id, coupon_lot.remark,
  coupon.code,  coupon_lot.coupon_type, coupon.state,
  coupon_lot.ckey, coupon_lot.cvalue, coupon_lot.discount, coupon_lot.type, coupon_lot.channel, 
  coupon_lot.is_reusable, coupon_lot.start_datetime,
  coupon_lot.end_datetime, coupon_lot.create_datetime, coupon.update_datetime ,coupon_lot.department,
  coupon_lot.state as couponLotState, coupon_lot.create_operator,coupon_lot.coupon_category,
  coupon_lot.pdt_code,brand.brand_name,product_category.category_name
  from coupon_lot
  left join coupon 
  on coupon.coupon_lot_id = coupon_lot.coupon_lot_id
  LEFT JOIN brand
  ON brand.brand_id=coupon_lot.brand_id
  LEFT JOIN product_category
  on product_category.category_id=coupon_lot.category_id
  group by coupon_lot.coupon_lot_id
  order by coupon_lot.create_datetime DESC
  limit N,N

Count: 22  Time=9.61s (211s)  Lock=0.00s (0s)  Rows=1.0 (22), [dubbo]@2hosts
  select count(*)
  from coupon_lot
  left join coupon 
  on coupon.coupon_lot_id = coupon_lot.coupon_lot_id
  LEFT JOIN brand
  ON brand.brand_id=coupon_lot.brand_id
  LEFT JOIN product_category
  on product_category.category_id=coupon_lot.category_id

Count: 5  Time=2.47s (12s)  Lock=0.00s (0s)  Rows=0.0 (0), [xx]@2hosts
  select
  user_id, usename, nickname, password, user_group_id, realname, gender, email, mobilephone, 
  birthday, province_id, city_id, district_id, marry, income, remarks, create_datetime, 
  active_state, verityEmail, verityPhone, credit, last_login, last_ip, is_locked, channel, 
  tag, union_partner_uuid, union_user_safekey, is_black, qq, weibo_id, verity_email_key, 
  verity_phone_key, verity_email_datetime, verity_phone_datetime, verity_question, 
  verity_answer, cps_code, cps_time_from, cps_time_to, cps_cookie, first_channel
  from user_info where mobilephone = 'S' and (channel is null or trim(channel) ='S')

Count: 177  Time=1.40s (247s)  Lock=0.00s (0s)  Rows=1.0 (177), [xx]@2hosts
  select count(*) from user_info
  LEFT JOIN system_region a
  ON province_id =a.region_id
  LEFT JOIN system_region b
  ON city_id = b.region_id
  LEFT JOIN system_region c
  ON district_id = c.region_id

Count: 1  Time=1.13s (1s)  Lock=0.00s (0s)  Rows=10.0 (10), [dubbo]@[xxx]
  select 
  return_sn,  relating_order_sn, return_from,  oi.order_out_sn ,
  add_time , return_type, 
  return_pay, ui.usename as userName, return_consignee, return_goods_count ,
  return_total_fee, total_paid, 
  return_desc, return_order_status,  return_pay_status ,
  return_shipping_status, order_return.lock_operator, order_return.return_invoice_no
  from order_return  LEFT JOIN   order_info oi
  on order_return.relating_order_sn = oi.order_sn 
  left join user_info ui on oi.user_id = ui.user_id
  left join order_payment on order_payment.order_sn = oi.order_sn
  order by order_return.add_time DESC
  , oi.order_sn 
  limit N,N

Count: 8  Time=1.09s (8s)  Lock=0.00s (0s)  Rows=10.0 (80), [dubbo]@2hosts
  select 
  return_sn,  relating_order_sn, return_from,  oi.order_out_sn ,
  add_time , return_type, 
  return_pay, ui.usename as userName, return_consignee, return_goods_count ,
  return_total_fee, total_paid, 
  return_desc, return_order_status,  return_pay_status ,
  return_shipping_status, order_return.lock_operator, order_return.return_invoice_no
  from order_return  LEFT JOIN   order_info oi
  on order_return.relating_order_sn = oi.order_sn 
  left join user_info ui on oi.user_id = ui.user_id
  left join order_payment on order_payment.order_sn = oi.order_sn
  order by order_return.add_time DESC
  limit N,N

Count: 1  Time=1.00s (1s)  Lock=0.00s (0s)  Rows=1.0 (1), root[root]@localhost
  select sleep(N)

[root@db-master-2 ~]#

最終總結：
mysqldumpslow報錯：Died at /usr/local/mysql/bin/mysqldumpslow line 161, <> chunk 236. 是因為top數目太多了，mysqldumpslow遍歷不過來的緣故。

[mysqldumpslow 報錯] Died at mysqldumpslow line 161, chunk 236.

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