GC overhead limit when mining wikipedia and extracting anchor text

[shubhamagarwal92]

Hi

I am following the steps provided here to train my model.

I have pre-processed the datapack. But when I am trying to "Build Data Structures and extract anchor text", I am having this GC overhead issue.

I have even increased the MAPRED and HADOOP memory to 15G and even provided opts for
Dmapreduce.reduce.java.opts and Dmapreduce.reduce.memory.mb

My system has 8 cores 32 GB, using java 8. This is the snippet of command that I am following.

hadoop \
jar target/FEL-0.1.0-fat.jar \
com.yahoo.semsearch.fastlinking.io.ExtractWikipediaAnchorText \
-Dmapreduce.map.env="JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64" \
-Dmapreduce.reduce.env="JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64" \
-Dyarn.app.mapreduce.am.env="JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64" \
-Dmapred.job.map.memory.mb=15144 \
-Dmapreduce.map.memory.mb=15144 \
-Dmapreduce.reduce.memory.mb=15144 \
-Dmapred.child.java.opts="-Xmx15g" \
-Dmapreduce.map.java.opts='-Xmx15g -XX:NewRatio=8 -XX:+UseSerialGC' \
-Dmapreduce.reduce.java.opts="-Xmx15g -XX:NewRatio=8 -XX:+UseSerialGC" \
-input wiki/${WIKI_MARKET}/${WIKI_DATE}/pages-articles.block \
-emap wiki/${WIKI_MARKET}/${WIKI_DATE}/entities.map \
-amap wiki/${WIKI_MARKET}/${WIKI_DATE}/anchors.map \
-cfmap wiki/${WIKI_MARKET}/${WIKI_DATE}/alias-entity-counts.map \
-redir wiki/${WIKI_MARKET}/${WIKI_DATE}/redirects

Could you please suggest why this might be happening?

Pardon me as I am novice to hadoop and java

[shubhamagarwal92]

@aasish Could you please comment as to how should I resolve this?

[shubhamagarwal92]

FYI, I solved the issue with this shell script. README needs to be updated.