bardock commented on issue #2013: Unable to consume messages from a partition URL: https://github.com/apache/incubator-pulsar/issues/2013#issuecomment-406349051 @sijie We don't have bookkeeper's metrics. This cluster has 9 bookies, and we see that 4 of them were using more CPU than the rest (3 of them were stuck at 13%). When we restarted the cluster, every bookie's CPU went normal.  The problem with partition-4 of this topic started at 16:05 (GMT -3). So we believe these bookies were performing poorly and caused the throttling. Sadly, we don't have a jstack for that moment. Is there anything we can tune up or monitor to prevent this issue? Here is our [config file](https://github.com/apache/incubator-pulsar/files/2210966/bookkeeper.conf.txt). We are using bk 4.7.0 (shipped with pulsar 2.0.0-rc1) but we are planning to upgrade to 4.7.1. Thanks!
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