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https://issues.apache.org/jira/browse/SOLR-14251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17541586#comment-17541586
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David Smiley commented on SOLR-14251:
-------------------------------------
NodeStateProviders can be considered deprecated, BTW. Ultimately, the metrics
API is consulted.
Like Gezapeti said, unfortunately, the Directory instance simply isn't always
accessible, such as in this location where the core to be split is remote to
SplitShardCmd which is run on the Overseer. I am in favor of a simple boolean
here. I suppose an alternative would be adding a new core admin operation or
augmenting an existing one. Or add a new metric. Then call this API from
SplitShardCmd instead of using NodeStateProviders.
> Shard Split on HDFS
> --------------------
>
> Key: SOLR-14251
> URL: https://issues.apache.org/jira/browse/SOLR-14251
> Project: Solr
> Issue Type: Bug
> Components: hdfs
> Affects Versions: 8.4
> Reporter: Johannes Brucher
> Priority: Major
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Shard Split on HDFS Index will evaluate local disc space instead of HDFS space
> When performing a shard split on an index that is stored on HDFS the
> SplitShardCmd however evaluates the free disc space on the local file system
> of the server where Solr is installed.
> SplitShardCmd assumes that its main phase (when the Lucene index is being
> split) always executes on the local file system of the shard leader; and
> indeed the ShardSplitCmd.checkDiskSpace() checks the local file system's free
> disk space - even though the actual data is written to the HDFS Directory so
> it (almost) doesn't affect the local FS (except for core.properties file).
> See also:
> [https://lucene.472066.n3.nabble.com/HDFS-Shard-Split-td4449920.html]
> My setup to reproduce the issue:
> * Solr deployed on Openshift with local disc of about 5GB
> * HDFS configuration based on solrconfig.xml with
> {code:java}
> <directoryFactory name="DirectoryFactory" class="solr.HdfsDirectoryFactory">
> <str name="solr.hdfs.home">hdfs://path/to/index/</str>
> ...
> {code}
> * Split command:
> {code:java}
> .../admin/collections?action=SPLITSHARD&collection=collection1&shard=shard1&async=1234{code}
> * Response:
> {code:java}
> {
> "responseHeader":{"status":0,"QTime":32},
> "Operation splitshard caused
> exception:":"org.apache.solr.common.SolrException:org.apache.solr.common.SolrException:
> not enough free disk space to perform index split on node <solr
> instance>:8983_solr, required: 294.64909074269235, available:
> 5.4632568359375",
> "exception":{
> "msg":"not enough free disk space to perform index split on node <solr
> instance>:8983_solr, required: 294.64909074269235, available:
> 5.4632568359375",
> "rspCode":500},
> "status":{"state":"failed","msg":"found [1234] in failed tasks"}
> }
> {code}
>
>
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