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https://issues.apache.org/jira/browse/HDDS-361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16640421#comment-16640421
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Hanisha Koneru commented on HDDS-361:
-------------------------------------
[~ljain], thanks for working on this.
The patch looks very good. I just have a few minor comments.
# In {{BlockDeletingService#executeDeleteTxn()}}, if we cannot delete a block,
we skip that block and continue deleting other blocks. So the actual number of
blocks deleted might be less than were scheduled in the transaction. In
{{BlockDeletingService#call()}}, we update the {{numBlocksDeleted}} with the
count of number of blocks scheduled for deletion.
{code:java}
if (delTxn != null) {
executeDeleteTxn(delTxn, defaultStore);
// increment number of blocks deleted for the container
numBlocksDeleted += delTxn.getLocalIDCount();
// if successful, txn can be removed from delete table{code}
Instead, we should update {{numBlocksDeleted}} with the number of blocks
actually deleted in {{executeDeleteTxn}}
{code:java}
if (delTxn != null) {
int deletedBlocksCount = executeDeleteTxn(delTxn, defaultStore);
// increment number of blocks deleted for the container
numBlocksDeleted += deletedBlocksCount;
// if successful, txn can be removed from delete table{code}
# Also, before deleting the transaction from the Pending Deletes tables, we
should verify that all the blocks in the transaction were successfully deleted.
{code:java}
// if successful, txn can be removed from delete table
if (deletedBlocksCount == delTxn.getLocalIDCount()) {
batch.delete(pendingDeletes.getHandle(),
Longs.toByteArray(delTxn.getTxID()));
}
{code}
# In {{BlockDeletingService#executeDeleteTxn}}, the null check for delTxn is
redundant. We perform this check before calling the function too.
# A NIT: In {{BlockManagerImpl}}, most of the functions get the DB and then
get the default table. We could have this in a private function to avoid
redundancy.
{code:java}
private Table getDefaultTable(containerData, conf) {
DBStore db = BlockUtils.getDB(cData, config);
return db.getTable(DEFAULT_TABLE)
}
{code}
P.S: The patch does not apply to trunk anymore.
> Use DBStore and TableStore for DN metadata
> ------------------------------------------
>
> Key: HDDS-361
> URL: https://issues.apache.org/jira/browse/HDDS-361
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Reporter: Xiaoyu Yao
> Assignee: Lokesh Jain
> Priority: Major
> Attachments: HDDS-361.001.patch, HDDS-361.002.patch
>
>
> As part of OM performance improvement we used Tables for storing a particular
> type of key value pair in the rocks db. This Jira aims to use Tables for
> separating block keys and deletion transactions in the container db.
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