The build I used yesterday didn't include HBASE-16189 <https://issues.apache.org/jira/browse/HBASE-16189>
Once it is included, the cluster can be downgraded fine. I wonder how users would know that their existing deployment has HBASE-16189 <https://issues.apache.org/jira/browse/HBASE-16189> before upgrading to 2.0 release. On Tue, Dec 6, 2016 at 2:29 AM, ramkrishna vasudevan < ramkrishna.s.vasude...@gmail.com> wrote: > @Ted > Does your version have this fix > https://issues.apache.org/jira/browse/HBASE-16189 > > Regards > Ram > > On Tue, Dec 6, 2016 at 3:56 PM, Ted Yu <yuzhih...@gmail.com> wrote: > > > Is the assumption that hbase:meta would not split ? > > > > In other thread, Francis Liu was proposing supporting splittable > > hbase:meta in 2.0 release. > > > > Cheers > > > > > On Dec 6, 2016, at 2:20 AM, 张铎 <palomino...@gmail.com> wrote: > > > > > > Could this be solved by hosting meta only on master? > > > > > > BTW, MetaCellComparator is introduced in HBASE-10800. > > > > > > Thanks. > > > > > > 2016-12-06 17:44 GMT+08:00 Ted Yu <yuzhih...@gmail.com>: > > > > > >> Hi, > > >> When I restarted a cluster with 1.1 , I found that hbase:meta region > > >> (written to by the previously deployed 2.0) couldn't be opened: > > >> > > >> Caused by: java.io.IOException: > > >> org.apache.hadoop.hbase.io.hfile.CorruptHFileException: Problem > reading > > >> HFile Trailer from file hdfs://yz1.xx.com:8020/apps/ > hbase/data/data/ > > >> hbase/meta/1588230740/info/599fc8a37311414e876803312009a986 > > >> at > > >> org.apache.hadoop.hbase.regionserver.HStore. > openStoreFiles(HStore.java: > > >> 579) > > >> at > > >> org.apache.hadoop.hbase.regionserver.HStore. > loadStoreFiles(HStore.java: > > >> 534) > > >> at > > >> org.apache.hadoop.hbase.regionserver.HStore.<init>(HStore.java:275) > > >> at > > >> org.apache.hadoop.hbase.regionserver.HRegion. > instantiateHStore(HRegion. > > >> java:5150) > > >> at > > >> org.apache.hadoop.hbase.regionserver.HRegion$1.call(HRegion.java:912) > > >> at > > >> org.apache.hadoop.hbase.regionserver.HRegion$1.call(HRegion.java:909) > > >> at java.util.concurrent.FutureTask.run(FutureTask.java:266) > > >> at > > >> java.util.concurrent.Executors$RunnableAdapter. > call(Executors.java:511) > > >> at java.util.concurrent.FutureTask.run(FutureTask.java:266) > > >> ... 3 more > > >> Caused by: org.apache.hadoop.hbase.io.hfile.CorruptHFileException: > > Problem > > >> reading HFile Trailer from file hdfs:// > > >> yz1.xx.com:8020/apps/hbase/data/data/hbase/ meta/1588230740/ > > >> info/599fc8a37311414e876803312009a986 > > >> at > > >> org.apache.hadoop.hbase.io.hfile.HFile.pickReaderVersion( > > HFile.java:483) > > >> at > > >> org.apache.hadoop.hbase.io.hfile.HFile.createReader(HFile.java:511) > > >> at > > >> org.apache.hadoop.hbase.regionserver.StoreFile$Reader. > > >> <init>(StoreFile.java:1128) > > >> at > > >> org.apache.hadoop.hbase.regionserver.StoreFileInfo. > > >> open(StoreFileInfo.java:267) > > >> at > > >> org.apache.hadoop.hbase.regionserver.StoreFile.open( > StoreFile.java:409) > > >> at > > >> org.apache.hadoop.hbase.regionserver.StoreFile. > > >> createReader(StoreFile.java:517) > > >> at > > >> org.apache.hadoop.hbase.regionserver.HStore.createStoreFileAndReader( > > >> HStore.java:687) > > >> at > > >> org.apache.hadoop.hbase.regionserver.HStore.access$ > 000(HStore.java:130) > > >> at > > >> org.apache.hadoop.hbase.regionserver.HStore$1.call(HStore.java:554) > > >> at > > >> org.apache.hadoop.hbase.regionserver.HStore$1.call(HStore.java:551) > > >> ... 6 more > > >> Caused by: java.io.IOException: java.lang.ClassNotFoundException: > > >> org.apache.hadoop.hbase.CellComparator$MetaCellComparator > > >> at > > >> org.apache.hadoop.hbase.io.hfile.FixedFileTrailer.getComparatorClass( > > >> FixedFileTrailer.java:581) > > >> at > > >> org.apache.hadoop.hbase.io.hfile.FixedFileTrailer.deserializeFromPB( > > >> FixedFileTrailer.java:300) > > >> at > > >> org.apache.hadoop.hbase.io.hfile.FixedFileTrailer. > > >> deserialize(FixedFileTrailer.java:242) > > >> at > > >> org.apache.hadoop.hbase.io.hfile.FixedFileTrailer.readFromStream( > > >> FixedFileTrailer.java:407) > > >> at > > >> org.apache.hadoop.hbase.io.hfile.HFile.pickReaderVersion( > > HFile.java:468) > > >> ... 15 more > > >> Caused by: java.lang.ClassNotFoundException: > > >> org.apache.hadoop.hbase.CellComparator$MetaCellComparator > > >> at java.net.URLClassLoader.findClass(URLClassLoader.java:381) > > >> at java.lang.ClassLoader.loadClass(ClassLoader.java:424) > > >> at sun.misc.Launcher$AppClassLoader.loadClass( > Launcher.java:331) > > >> at java.lang.ClassLoader.loadClass(ClassLoader.java:357) > > >> at java.lang.Class.forName0(Native Method) > > >> at java.lang.Class.forName(Class.java:264) > > >> at > > >> org.apache.hadoop.hbase.io.hfile.FixedFileTrailer.getComparatorClass( > > >> FixedFileTrailer.java:579) > > >> > > >> When user does rolling upgrade from 1.1 to 2.0, the above may cause > > problem > > >> if hbase:meta region is updated by server running 2.0 but later > > assigned to > > >> a region server which still runs 1.1 (due to crash of the server > running > > >> 2.0, e.g.) > > >> > > >> I want to get community feedback on the severity of this issue. > > >> > > >> Thanks > > >> > > >
