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What is GC Overhead Limit Exceeded Hadoop

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Hi All,

When i tried to list of files in my hdfs folder by using hdfs fs -ls /myfolder command  i am facing GC Overhead Limit exceeded exception error in hadoop.Please help me how to solve this error.

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    2 Answers

    1. This answer was edited.

      Hello Srilakshmi,

       

      GC Overhead Limit exception error will come when doing data copy from local to hdfs or hdfs to local and setup a replication for hdfs  files at that time also this GC overhead limit exceeded error will come.

      We need to setup HADOOP_CLIENT_OPTS fix this error.

      export HADOOP_CLIENT_OPTS=”-XX:-UseGCOverheadLimit -Xmx4096m”

      • HADOOP_CLIENT_OPTS – All hadoop components run as a client.
      • This was needed because all the hadoop commands run as a client.
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    2. srilakshmi

      srilakshmi

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      Teacher

      Hello ,

      Generally GC Overhead limit exceeded error will come in below senories.

      • If the hdfs folder having more then 1 million files and if you tried to run hdfs commands like -ls,-du -h,-copyToLocal etc.

      How to solve GC Overhead limit exceeded error

      Hadoop commands we run on edgenode so increase hadoop client heap memory on fly .

      • Open hadoop edge node in putty
      • Login to your account
      • copy paste below command on your terminal to solve GC Overhead limit exceeded error in your hadoop environment.

      export HADOOP_CLIENT_OPTS=”$HADOOP_OPTS -Xmx5g”

      The above command will use full to fix GC Overhead limit exceeded error in hadoop and 5g indicates heap memory you can increase the value based on your requirement.

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