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https://issues.apache.org/jira/browse/SOLR-2104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13064456#comment-13064456
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Shalin Shekhar Mangar commented on SOLR-2104:
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For #1: The $deleteDocById is meant for deleting docs which are already in the
index. The current row/doc is not committed to the index yet and therefore it
is not affected by this flag. Hence the need to return both the flags for your
use-case.
Bug #2: This fix will be available in v3.4 and v4.0. Unfortunately, we cannot
give the right statistics but at least a commit will be called.
> DIH special command $deleteDocById dosn't skip the document and doesn't
> increment the deleted statistics
> --------------------------------------------------------------------------------------------------------
>
> Key: SOLR-2104
> URL: https://issues.apache.org/jira/browse/SOLR-2104
> Project: Solr
> Issue Type: Bug
> Components: contrib - DataImportHandler
> Affects Versions: 1.4, 1.4.1
> Reporter: Ephraim Ofir
> Priority: Minor
>
> 1. Not sure it's a bug, but looks like a bug to me - if the query returns any
> values other than $deleteDocById for the row you want deleted, it deletes the
> row but also re-adds it with the rest of the data, so in effect the row isn't
> deleted. In order to work around this issue, you have to either make sure no
> data other than $deleteDocById=<id> exists in rows to be deleted or add
> $skipDoc='true'
> (which I think is a little counter-intuitive, but was the better choice in my
> case). My query looks something like:
> SELECT u.id,
> u.name,
> ...
> IF(u.delete_flag > 0, u.id, NULL) AS $deleteDocById,
> IF(u.delete_flag > 0, 'true', NULL) AS $skipDoc FROM users_tb u
> 2. $deleteDocById doesn't update the statistics of deleted documents.
> This has 2 downsides, the obvious one is that you don't know if/how many
> documents were deleted, the not-so-obvious one is that if your import
> contains only deleted items, it won't be committed automatically by DIH and
> you'll have to commit it manually.
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