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HBase >> mail # dev >> precommit exception when opening HFiles.


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precommit exception when opening HFiles.
In some of the failed test logs in trunk precommit I see these.
Look bad. Is that something to worry about?
java.io.IOException: java.io.IOException: java.io.IOException: java.lang.InstantiationException: org.apache.hadoop.io.RawComparator
    at org.apache.hadoop.hbase.regionserver.HRegion.initializeRegionInternals(HRegion.java:612)
    at org.apache.hadoop.hbase.regionserver.HRegion.initialize(HRegion.java:533)
    at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:4086)
    at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:4036)
    at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.openRegion(OpenRegionHandler.java:427)
    at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.process(OpenRegionHandler.java:130)
    at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:202)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)
Caused by: java.io.IOException: java.io.IOException: java.lang.InstantiationException: org.apache.hadoop.io.RawComparator
    at org.apache.hadoop.hbase.regionserver.HStore.loadStoreFiles(HStore.java:450)
    at org.apache.hadoop.hbase.regionserver.HStore.<init>(HStore.java:215)
    at org.apache.hadoop.hbase.regionserver.HRegion.instantiateHStore(HRegion.java:3060)
    at org.apache.hadoop.hbase.regionserver.HRegion$1.call(HRegion.java:585)
    at org.apache.hadoop.hbase.regionserver.HRegion$1.call(HRegion.java:583)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    ... 3 more
Caused by: java.io.IOException: java.lang.InstantiationException: org.apache.hadoop.io.RawComparator
    at org.apache.hadoop.hbase.io.hfile.FixedFileTrailer.createComparator(FixedFileTrailer.java:607)
    at org.apache.hadoop.hbase.io.hfile.FixedFileTrailer.createComparator(FixedFileTrailer.java:615)
    at org.apache.hadoop.hbase.io.hfile.HFileReaderV2.<init>(HFileReaderV2.java:115)
    at org.apache.hadoop.hbase.io.hfile.HFile.pickReaderVersion(HFile.java:564)
    at org.apache.hadoop.hbase.io.hfile.HFile.createReaderWithEncoding(HFile.java:599)
    at org.apache.hadoop.hbase.regionserver.StoreFile$Reader.<init>(StoreFile.java:1294)
    at org.apache.hadoop.hbase.regionserver.StoreFile.open(StoreFile.java:525)
    at org.apache.hadoop.hbase.regionserver.StoreFile.createReader(StoreFile.java:628)
    at org.apache.hadoop.hbase.regionserver.HStore$1.call(HStore.java:426)
    at org.apache.hadoop.hbase.regionserver.HStore$1.call(HStore.java:422)
    ... 8 more
Caused by: java.lang.InstantiationException: org.apache.hadoop.io.RawComparator
    at java.lang.Class.newInstance0(Class.java:340)
    at java.lang.Class.newInstance(Class.java:308)
    at org.apache.hadoop.hbase.io.hfile.FixedFileTrailer.createComparator(FixedFileTrailer.java:605)
    ... 17 more
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB