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MINOR: Don't generate unnecessary strings for debug logging in FetchSessionHandler (#7394) 

Profiling while benchmarking shows unnecessary calls to
`responseDataToLogString` in FetchSessionHandler when logging was set to
INFO level. This leads to 1.47% of the JVM CPU time going to this method.
Fix it by checking if debug logging is enabled.

Reviewers: Ismael Juma <ismael@juma.me.uk>
This commit is contained in:
Lucas Bradstreet 2019-09-28 17:03:06 -07:00 committed by Ismael Juma
parent 8818a7037d
commit 1dc5063cde
1 changed files with 11 additions and 8 deletions
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19
clients/src/main/java/org/apache/kafka/clients/FetchSessionHandler.java
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@ -397,14 +397,15 @@ public class FetchSessionHandler {
nextMetadata = FetchMetadata.INITIAL;
return false;
} else if (response.sessionId() == INVALID_SESSION_ID) {
log.debug("Node {} sent a full fetch response{}",
node, responseDataToLogString(response));
if (log.isDebugEnabled())
log.debug("Node {} sent a full fetch response{}", node, responseDataToLogString(response));
nextMetadata = FetchMetadata.INITIAL;
return true;
} else {
// The server created a new incremental fetch session.
log.debug("Node {} sent a full fetch response that created a new incremental " +
"fetch session {}{}", node, response.sessionId(), responseDataToLogString(response));
if (log.isDebugEnabled())
log.debug("Node {} sent a full fetch response that created a new incremental " +
"fetch session {}{}", node, response.sessionId(), responseDataToLogString(response));
nextMetadata = FetchMetadata.newIncremental(response.sessionId());
return true;
}
@ -416,14 +417,16 @@ public class FetchSessionHandler {
return false;
} else if (response.sessionId() == INVALID_SESSION_ID) {
// The incremental fetch session was closed by the server.
log.debug("Node {} sent an incremental fetch response closing session {}{}",
node, nextMetadata.sessionId(), responseDataToLogString(response));
if (log.isDebugEnabled())
log.debug("Node {} sent an incremental fetch response closing session {}{}",
node, nextMetadata.sessionId(), responseDataToLogString(response));
nextMetadata = FetchMetadata.INITIAL;
return true;
} else {
// The incremental fetch session was continued by the server.
log.debug("Node {} sent an incremental fetch response for session {}{}",
node, response.sessionId(), responseDataToLogString(response));
if (log.isDebugEnabled())
log.debug("Node {} sent an incremental fetch response for session {}{}",
node, response.sessionId(), responseDataToLogString(response));
nextMetadata = nextMetadata.nextIncremental();
return true;
}