wdqs-updater crashed on wdqs100 at mostly the same time (Apr 23, 2018, ~9:45 UTC).
Looking at logs on wdqs1004, we can see a non-200 response from blazegraph (P7025). It looks like blazegraph was unable to create threads.
The updater did not recover. A thread dump (P7026) shows a non daemon thread that seems to be related to an HTTP server. We previously thought that this thread was related to jolokia (T188413), but jolokia has been removed. We need to find another explanation.