Timothy Potter created SOLR-7361:
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Summary: Main Jetty thread blocked by core loading delays HTTP
listener from binding if core loading is slow
Key: SOLR-7361
URL: https://issues.apache.org/jira/browse/SOLR-7361
Project: Solr
Issue Type: Bug
Components: SolrCloud
Reporter: Timothy Potter
During server startup, the CoreContainer uses an ExecutorService to load cores
in multiple back-ground threads but then blocks until cores are loaded, see:
CoreContainer#load around line 290 on trunk (invokeAll). From the JavaDoc on
that method, we have:
{quote}
Executes the given tasks, returning a list of Futures holding their status and
results when all complete. Future.isDone() is true for each element of the
returned list.
{quote}
In other words, this is a blocking call.
This delays the Jetty HTTP listener from binding and accepting requests until
all cores are loaded. Do we need to block the main thread?
Also, prior to this happening, the node is registered as a live node in ZK,
which makes it a candidate for receiving requests from the Overseer, such as to
service a create collection request. The problem of course is that the node
listed in /live_nodes isn't accepting requests yet. So we either need to
unblock the main thread during server loading or maybe wait longer before we
register as a live node ... not sure which is the better way forward?
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