Introduction
Slow journal frame log entries will be logged at Warning level in your ErrorLog file and will mention something like this:
.....journal frame took 28158 ms to journal...
Examples
2016-11-17 18:38:28.476 Warning: forest Documents journal frame took 28152 ms to journal (sem=0 disk=28152 ja=0 dbrep=0 ld=0): {{fsn=121519836, chksum=0xd79a4bd0, words=33}, op=commit, time=1479425880, mfor=18383617934651757356, mtim=14445621353792290, mfsn=121519625, fmcl=16964678471847070106, fmf=18383617934651757356, fmt=14445621353792290, fmfsn=121519625, sk=10604213488372914348, pfo=116961308}
2016-11-17 18:38:28.482 Warning: forest Documents journal frame took 26308 ms to journal (sem=0 disk=26308 ja=0 dbrep=0 ld=0): {{fsn=113883463, chksum=0x10b1bd40, words=23}, op=fastQueryTimestamp, time=1479425882, mfor=959797732298875593, mtim=14701896887337160, mfsn=113882912, fmcl=16964678471847070106, fmf=959797732298875593, fmt=14701896887337160, fmfsn=113882912, sk=4596785426549375418, pfo=54687472}
2016-11-17 18:38:28.482 Warning: forest Documents journal frame took 28155 ms to journal (sem=0 disk=28155 ja=0 dbrep=0 ld=0):{{fsn=121740077, chksum=0xfd950360, words=31}, op=prepare, time=1479425880, mfor=10258363344370988969, mtim=14784083780681960, mfsn=121740077,fmcl=16964678471847070106, fmf=10258363344370988969, fmt=14784083780681960, fmfsn=121740077, sk=12062047643091825183, pfo=14672600}
Understanding the messages in further detail
These messages give you further hints on what is causing the delay; in most cases, you would probably want to involve the MarkLogic Support team in diagnosing the root cause of the problem although the table below should help with further interpretation of cause of these messages:
Item |
Description |
---|
sem |
time waiting on semaphore |
disk |
time waiting on disk |
ja |
time waiting if journal archive is lagged |
dbrep |
time waiting if DR replication is lagged |
ld |
time waiting to replicate the journal frame to a HA replica |
fsn |
frame sequence number |
chksum |
frame checksum |
words |
length in words of the frame |
op |
the type of frame |
time |
UNIX time |
mfor |
ID of master forest (if replica) |
mtim |
when master became master |
mfsn |
master forest fsn |
fmcl |
foreign master cluster id |
fmf |
foreign master forest id |
fmt |
when foreign master became HA master |
fmfsn |
foreign master fsn |
sk |
sequence key (frame unique id) |
pfo |
previous frame offset |
Further reading / related articles