Build failed in Jenkins: kafka-trunk-jdk9 #226

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See <https://builds.apache.org/job/kafka-trunk-jdk9/226/display/redirect?page=changes>

Changes:

[rajinisivaram] KAFKA-6255; Add ProduceBench to Trogdor

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Started by an SCM change
[EnvInject] - Loading node environment variables.
Building remotely on H30 (ubuntu xenial) in workspace <https://builds.apache.org/job/kafka-trunk-jdk9/ws/>
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://github.com/apache/kafka.git # timeout=10
Fetching upstream changes from https://github.com/apache/kafka.git
 > git --version # timeout=10
 > git fetch --tags --progress https://github.com/apache/kafka.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse refs/remotes/origin/trunk^{commit} # timeout=10
 > git rev-parse refs/remotes/origin/origin/trunk^{commit} # timeout=10
Checking out Revision 58877a0deacd6c13436af83ef5be1a6f75a3ac4a (refs/remotes/origin/trunk)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 58877a0deacd6c13436af83ef5be1a6f75a3ac4a
Commit message: "KAFKA-6255; Add ProduceBench to Trogdor"
 > git rev-list 1a1d923f252e9b1576dad6f7285f237feb064f64 # timeout=10
ERROR: No tool found matching GRADLE_3_4_RC_2_HOME
[kafka-trunk-jdk9] $ /bin/bash -xe /tmp/jenkins6617992994547749440.sh
+ rm -rf <https://builds.apache.org/job/kafka-trunk-jdk9/ws/.gradle>
+ /bin/gradle
/tmp/jenkins6617992994547749440.sh: line 4: /bin/gradle: No such file or directory
Build step 'Execute shell' marked build as failure
Recording test results
ERROR: No tool found matching GRADLE_3_4_RC_2_HOME
ERROR: Step ?Publish JUnit test result report? failed: Test reports were found but none of them are new. Did leafNodes run? 
For example, <https://builds.apache.org/job/kafka-trunk-jdk9/ws/clients/build/test-results/test/TEST-org.apache.kafka.clients.ApiVersionsTest.xml> is 4 hr 57 min old

ERROR: No tool found matching GRADLE_3_4_RC_2_HOME
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