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Warning: a long semaphore wait
Posted by: Atanu Saha
Date: April 05, 2018 03:38AM

I am getting below error in error log

InnoDB: Warning: a long semaphore wait:
--Thread 47095778944768 has waited at btr0cur.cc line 536 for 241.00 seconds the semaphore:
X-lock (wait_ex) on RW-latch at 0x2ad52683ff78 created in file dict0dict.cc line 2644
a writer (thread id 47095778944768) has reserved it in mode wait exclusive
number of readers 4, waiters flag 1, lock_word: fffffffffffffffc
Last time read locked in file btr0cur.cc line 545
Last time write locked in file /local/mysql-5.6.27.R1/storage/innobase/btr/btr0cur.cc line 536

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