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https://issues.apache.org/jira/browse/HBASE-20135?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HBASE-20135 started by Sakthi.
--------------------------------------
> NullPointerException during reading bloom filter when upgraded from hbase-1
> to hbase-2
> --------------------------------------------------------------------------------------
>
> Key: HBASE-20135
> URL: https://issues.apache.org/jira/browse/HBASE-20135
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 2.0.0-beta-2
> Reporter: Umesh Agashe
> Assignee: Sakthi
> Priority: Minor
> Fix For: 2.0.0
>
>
> When upgraded from hbase-1 to hbase-2, found following exception logged
> multiple times in the log:
> {code:java}
> ERROR [StoreFileOpenerThread-test_cf-1] regionserver.StoreFileReader: Error
> reading bloom filter meta for GENERAL_BLOOM_META -- proceeding without
> java.io.IOException: Comparator class
> org.apache.hadoop.hbase.KeyValue$RawBytesComparator is not instantiable
> at
> org.apache.hadoop.hbase.io.hfile.FixedFileTrailer.createComparator(FixedFileTrailer.java:628)
> at
> org.apache.hadoop.hbase.io.hfile.CompoundBloomFilter.<init>(CompoundBloomFilter.java:79)
> at
> org.apache.hadoop.hbase.util.BloomFilterFactory.createFromMeta(BloomFilterFactory.java:104)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileReader.loadBloomfilter(StoreFileReader.java:479)
> at
> org.apache.hadoop.hbase.regionserver.HStoreFile.open(HStoreFile.java:425)
> at
> org.apache.hadoop.hbase.regionserver.HStoreFile.initReader(HStoreFile.java:460)
> at
> org.apache.hadoop.hbase.regionserver.HStore.createStoreFileAndReader(HStore.java:671)
> at
> org.apache.hadoop.hbase.regionserver.HStore.lambda$openStoreFiles$0(HStore.java:537)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> Caused by: java.lang.NullPointerException{code}
>
> Analysis from [~anoop.hbase]:
> Checking the related code. There seems no issue.. We are not going
> to even fail reading the bloom. In 2.0 code base we expect the
> comparator class name to be null. But in 1.x we write old KV based
> Raw Bytes comparator class name. So reading that back, we will return
> class name as null and we get NPE it looks like.
> {code}
> else if
> (comparatorClassName.equals("org.apache.hadoop.hbase.KeyValue$RawBytesComparator")
> ||
> comparatorClassName.equals("org.apache.hadoop.hbase.util.Bytes$ByteArrayComparator"))
> {
> // When the comparator to be used is Bytes.BYTES_RAWCOMPARATOR,
> we just return null from here
> // Bytes.BYTES_RAWCOMPARATOR is not a CellComparator
> comparatorKlass = null;
> }
> {code}
> We can better do a null check before trying the comparator class
> instantiation so that we can avoid this scary error logs
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