[jira] [Created] (HBASE-20761) FSReaderImpl#readBlockDataInternal can fail to switch to HDFS checksums in some edge cases

["Esteban Gutierrez (JIRA)" <ji...@apache.org>]

Esteban Gutierrez created HBASE-20761:
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             Summary: FSReaderImpl#readBlockDataInternal can fail to switch to HDFS checksums in some edge cases
                 Key: HBASE-20761
                 URL: https://issues.apache.org/jira/browse/HBASE-20761
             Project: HBase
          Issue Type: Bug
          Components: HFile
            Reporter: Esteban Gutierrez


One of our users reported this problem on HBase 1.2 before and after HBASE-11625:

{code}
Caused by: java.io.IOException: On-disk size without header provided is 131131, but block header contains 0. Block offset: 2073954793, data starts with: \x00\x00\x00\x00\x00\x00\x00\x0\
0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00
        at org.apache.hadoop.hbase.io.hfile.HFileBlock.validateOnDiskSizeWithoutHeader(HFileBlock.java:526)
        at org.apache.hadoop.hbase.io.hfile.HFileBlock.access$700(HFileBlock.java:92)
        at org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderImpl.readBlockDataInternal(HFileBlock.java:1699)
        at org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderImpl.readBlockData(HFileBlock.java:1542)
        at org.apache.hadoop.hbase.io.hfile.HFileReaderV2.readBlock(HFileReaderV2.java:445)
        at org.apache.hadoop.hbase.util.CompoundBloomFilter.contains(CompoundBloomFilter.java:100)
{code}

The problems occurs when we do a read a block without HDFS checksums enabled and due some data corruption we end with an empty headerBuf while trying to read the block before the HDFS checksum failover code. This will cause further attempts to read the block to fail since we will still retry the corrupt replica instead of reporting the corrupt replica and trying a different one. 








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