marco polo created ACCUMULO-3509:
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Summary: Scanner lock will prevent idle scans to be locked, hence
blocking SimpleTimer thread
Key: ACCUMULO-3509
URL: https://issues.apache.org/jira/browse/ACCUMULO-3509
Project: Accumulo
Issue Type: Bug
Components: tserver
Affects Versions: 1.6.0
Reporter: marco polo
Fix For: 1.7.0, 1.6.3
Synchronization with Tablet$Scanner via a read() will block close() being
called via the sweep method in TabletServer. As a result, the SimpleTimer
thread does not continue, and idle threads grow until the scan completes.
My patch, which is forthcoming, converts synchronized methods to use a fair
lock. If the lock is held by a read call, the close call will attempt to obtain
it, time out, and return indicating a close was not successful. The sweep will
continue, and the SimpleTimer thread will respawn later, attempting closure on
those Tablets at a later time.
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