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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6942) Endpoint implementation for bulk delete rows
Date Tue, 16 Oct 2012 04:31:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13476723#comment-13476723

Anoop Sam John commented on HBASE-6942:

In the Delete template way, pass one Delete object only. The rowkey will be dummy only.. What
we grab from this is which all family/col/version delete needed. User can create the Delete
object and call deleteColumn(s) etc on that object....
At Endpoint side we will make use of the Delete object and get the family map from that..
We will use that family map to create the family map for the new Delete objects that we have
Here is the sample code for that
Delete delete = new Delete(deleteRowKey);
            if (deleteTemplate != null) {
              // when a delete is passed, get all the properties of that delete other than
              // rowkey and give to the new Delete objects being created
              // No need to check for row locks. No way to get these locks at the client
              // side as the rows itself is not known.
              setFamilyMap(deleteRowKey, deleteTemplate, delete);
private void setFamilyMap(byte[] deleteRowKey, Delete deleteTemplate, Delete delete) {
    Map<byte[], List<KeyValue>> deleteTemplateFamilyMap = deleteTemplate.getFamilyMap();
    Map<byte[], List<KeyValue>> deleteFamilyMap = new HashMap<byte[], List<KeyValue>>();
    for (Entry<byte[], List<KeyValue>> entry : deleteTemplateFamilyMap.entrySet())
      List<KeyValue> deleteTemplateKVs = entry.getValue();
      List<KeyValue> deleteKVs = new ArrayList<KeyValue>(deleteTemplateKVs.size());
      for (KeyValue kv : deleteTemplateKVs) {
        deleteKVs.add(new KeyValue(deleteRowKey, entry.getKey(), kv.getQualifier(), kv
            .getTimestamp(), Type.codeToType(kv.getType())));
      deleteFamilyMap.put(entry.getKey(), deleteKVs);
> Endpoint implementation for bulk delete rows
> --------------------------------------------
>                 Key: HBASE-6942
>                 URL: https://issues.apache.org/jira/browse/HBASE-6942
>             Project: HBase
>          Issue Type: Improvement
>          Components: Coprocessors, Performance
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>             Fix For: 0.94.3, 0.96.0
>         Attachments: HBASE-6942.patch, HBASE-6942_V2.patch, HBASE-6942_V3.patch, HBASE-6942_V4.patch,
> We can provide an end point implementation for doing a bulk deletion of rows(based on
a scan) at the server side. This can reduce the time taken for such an operation as right
now it need to do a scan to client and issue delete(s) using rowkeys.
> Query like  delete from table1 where...

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