Lars Hofhansl created HBASE-17440:
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Summary: [0.98] Make sure DelayedClosing chore is stopped as soon
as an HConnection is closed
Key: HBASE-17440
URL: https://issues.apache.org/jira/browse/HBASE-17440
Project: HBase
Issue Type: Bug
Reporter: Lars Hofhansl
Assignee: Lars Hofhansl
We're seeing many issue with run-away ZK client connection in long running app
servers. 10k or more send or event threads are happening frequently.
While I looked around in the code I noticed that DelayedClosing closing is not
immediately ended when an HConnection is closed, when there's an issue with
HBase or ZK and client reconnect in a tight loop, this can lead temporarily to
very many threads running. These will all get cleaned out after at most 60s,
but during that time a lot of threads can be created.
The fix is a one-liner. We'll likely file other issues soon.
Interestingly branch-1 and beyond do not have this chore anymore, although - at
least in branch-1 and later - I still see the ZooKeeperAliveConnection.
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