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From "Yu Sun (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17020) keylen in midkey() should be computed correctly
Date Fri, 04 Nov 2016 11:06:58 GMT
Yu Sun created HBASE-17020:
------------------------------

             Summary: keylen in midkey() should be computed correctly
                 Key: HBASE-17020
                 URL: https://issues.apache.org/jira/browse/HBASE-17020
             Project: HBase
          Issue Type: Bug
          Components: HFile
            Reporter: Yu Sun
            Assignee: Yu Sun


in CellBasedKeyBlockIndexReader.midkey():
{code}
          ByteBuff b = midLeafBlock.getBufferWithoutHeader();
          int numDataBlocks = b.getIntAfterPosition(0);
          int keyRelOffset = b.getIntAfterPosition(Bytes.SIZEOF_INT * (midKeyEntry + 1));
          int keyLen = b.getIntAfterPosition(Bytes.SIZEOF_INT * (midKeyEntry + 2)) - keyRelOffset;
{code}
the local varible keyLen get this should be total length of: SECONDARY_INDEX_ENTRY_OVERHEAD
 + firstKey.length;

the code is:
{code}
    void add(byte[] firstKey, long blockOffset, int onDiskDataSize,
        long curTotalNumSubEntries) {
      // Record the offset for the secondary index
      secondaryIndexOffsetMarks.add(curTotalNonRootEntrySize);
      curTotalNonRootEntrySize += SECONDARY_INDEX_ENTRY_OVERHEAD
          + firstKey.length;
{code}

when the midkey last entry of a leaf-level index block, this may throw:
{quote}
2016-10-01 12:27:55,186 ERROR [MemStoreFlusher.0] regionserver.MemStoreFlusher: Cache flusher
failed for entry [flush region pora_6_item_feature,0061:,1473838922457.12617bc4ebbfd171018bf96ac9bdd2a7.]
java.lang.ArrayIndexOutOfBoundsException
        at org.apache.hadoop.hbase.util.ByteBufferUtils.copyFromBufferToArray(ByteBufferUtils.java:936)
        at org.apache.hadoop.hbase.nio.SingleByteBuff.toBytes(SingleByteBuff.java:303)
        at org.apache.hadoop.hbase.io.hfile.HFileBlockIndex$CellBasedKeyBlockIndexReader.midkey(HFileBlockIndex.java:419)
        at org.apache.hadoop.hbase.io.hfile.HFileReaderImpl.midkey(HFileReaderImpl.java:1519)
        at org.apache.hadoop.hbase.regionserver.StoreFile$Reader.midkey(StoreFile.java:1520)
        at org.apache.hadoop.hbase.regionserver.StoreFile.getFileSplitPoint(StoreFile.java:706)
        at org.apache.hadoop.hbase.regionserver.DefaultStoreFileManager.getSplitPoint(DefaultStoreFileManager.java:126)
        at org.apache.hadoop.hbase.regionserver.HStore.getSplitPoint(HStore.java:1983)
        at org.apache.hadoop.hbase.regionserver.ConstantFamilySizeRegionSplitPolicy.getSplitPoint(ConstantFamilySizeRegionSplitPolicy.java:77)
        at org.apache.hadoop.hbase.regionserver.HRegion.checkSplit(HRegion.java:7756)
        at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:513)
        at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:471)
        at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.access$800(MemStoreFlusher.java:75)
        at org.apache.hadoop.hbase.regionserver.MemStoreFlusher$FlushHandler.run(MemStoreFlusher.java:259)
        at java.lang.Thread.run(Thread.java:756)
{quote}





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