Messages in the ErrorLog.txt File
MarkLogic Server logs INFO level messages to the ErrorLog.txt file whenever a merge begins, completes, or is canceled. Additionally, there are other log messages that are logged at more detail logging levels during a merge. The following are some sample log messages for a typical merge:
2006-04-20 13:43:11.151 Info: Merging /var/opt/MarkLogic/Forests/bill/00000004 and /var/opt/MarkLogic/Forests/bill/00000005 to /var/opt/MarkLogic/Forests/bill/00000006 2006-04-20 13:43:15.726 Debug: OnDiskStand /var/opt/MarkLogic/Forests/bill/00000006, disk=47MB, memory=20MB 2006-04-20 13:43:15.726 Info: Merged 81 MB in 4 s at 20 MB/s to /var/opt/MarkLogic/Forests/bill/00000006 2006-04-20 13:43:15.806 Debug: ~OnDiskStand /var/opt/MarkLogic/Forests/bill/00000004 2006-04-20 13:43:15.806 Debug: ~OnDiskStand /var/opt/MarkLogic/Forests/bill/00000005 2006-04-20 13:43:15.859 Info: Deleted /var/opt/MarkLogic/Forests/bill/000000042006-04-20 13:43:15.894 Info: Deleted /var/opt/MarkLogic/Forests/bill/00000005
If you cancel a merge, you will see an message similar to the following in the ErrorLog.txt file:
2006-05-08 17:45:44.027 Error: PooledThread::run: XDMP-CANCELED: Canceled merge of stands: 13419435601900621379, 6182944041533805976 to: C:\Program Files\MarkLogic\Data\Forests\bill\0000009a
By examining the ErrorLog.txt file, you can determine when a merge started, when it completed, which stands where merged together, what stand they were merged into, the size of the merge, and other useful information.
Note
There must be sufficient disk space on the file system in which the forest data is stored for a merge to complete successfully; if a merge runs out of disk space, it will fail with an error message. Also, there must be sufficient disk space on the file system in which the log files reside to log any activity on the system. If there is no space left on the log file device, MarkLogic Server will abort. Additionally, if there is no disk space available to add messages to the log files, MarkLogic Server will fail to start.