public void checksumOk() {
    if (
      this.useHBaseChecksumConfigured && !this.useHBaseChecksum
        && (this.hbaseChecksumOffCount.getAndDecrement() < 0)
    ) {
      // The stream we need is already open (because we were using HBase checksum in the past).
      assert this.streamNoFsChecksum != null;
      this.useHBaseChecksum = true;
    }
  }
Report that checksum was ok, so we may ponder going back to HBase checksum.
hbase-server/src/main/java/org/apache/hadoop/hbase/io/FSDataInputStreamWrapper.java