Kihwal Lee created HDFS-4080:
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Summary: Add an option to disable block-level state change logging
Key: HDFS-4080
URL: https://issues.apache.org/jira/browse/HDFS-4080
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 3.0.0, 2.0.3-alpha
Reporter: Kihwal Lee
Although the block-level logging in namenode is useful for debugging, it can
add a significant overhead to busy hdfs clusters since they are done while the
namespace write lock is held. One example is shown in HDFS-4075. In this
example, the write lock was held for 5 minutes while logging 11 million log
messages for 5.5 million block invalidation events.
It will be useful if we have an option to disable these block-level log
messages and keep other state change messages going. If others feel that they
can turned into DEBUG (with addition of isDebugEnabled() checks), that may also
work too, but there might be people depending on the messages.
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