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From "wenbang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-18743) Files that are in use by a table have same name and namespace with default table cloned from a snapshot may be deleted when that snapshot and default table is deleted
Date Sat, 02 Sep 2017 07:25:00 GMT
wenbang created HBASE-18743:
-------------------------------

             Summary: Files that are in use by a table have same name and namespace with default
table cloned from a snapshot may be deleted when that snapshot and default table is deleted
                 Key: HBASE-18743
                 URL: https://issues.apache.org/jira/browse/HBASE-18743
             Project: HBase
          Issue Type: Bug
          Components: hbase
    Affects Versions: 1.1.6
            Reporter: wenbang
            Priority: Critical


We recently had a critical production issue in which HFiles that were still in use by a table
were deleted.
This appears to have been caused by conditions in which table have the same namespace and
name with default table cloned from a snapshot.when snapshot and default table be deleted,HFiles
that are still in use may be deleted.
For example:
Table with default namespace: "table1"
The namespace of the new table is the same as the name of the default table, and is generated
by snapshot cloning : "table1: table1"
When the snapshot and the default namespace table are deleted, the new table is also deleted
in the used HFILE
This is because the creation of the BackReferenceFile get the table Name is not normal, resulting
in can not find the reference file, hfilecleaner to delete the file is used, when the table
has not been major compact
Problem code:
{code:java}
  public static TableName valueOf(String namespaceAsString, String qualifierAsString) {
    if (namespaceAsString == null || namespaceAsString.length() < 1) {
      namespaceAsString = NamespaceDescriptor.DEFAULT_NAMESPACE_NAME_STR;
    }

    for (TableName tn : tableCache) {
      if (qualifierAsString.equals(tn.getQualifierAsString()) &&
          namespaceAsString.equals(tn.getNameAsString())) {
        return tn;
      }
    }

    return createTableNameIfNecessary(
        ByteBuffer.wrap(Bytes.toBytes(namespaceAsString)),
        ByteBuffer.wrap(Bytes.toBytes(qualifierAsString)));
  }
{code}

"namespaceAsString.equals(tn.getNameAsString()))" 
This code should be
"namespaceAsString.equals(tn.getNamespaceAsString()))"



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