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Posted to issues@lucene.apache.org by "Yonik Seeley (Jira)" <ji...@apache.org> on 2019/10/02 18:24:00 UTC
[jira] [Commented] (SOLR-13813) Shared storage online split support
[ https://issues.apache.org/jira/browse/SOLR-13813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16943057#comment-16943057 ]
Yonik Seeley commented on SOLR-13813:
-------------------------------------
This PR ( https://github.com/apache/lucene-solr/pull/918 ) adds a simple test.
It usually fails for shared storage :-( . Example:
{code}
java.lang.AssertionError:
Expected :50
Actual :49
{code}
And I normally see background exceptions like the following during the run:
{code}
Error occured pulling shard=shard1_1 collection=livesplit1 from shared store java.lang.Exception: Local Directory content /private/var/folders/_f/2q_bxy9d0kz45_rk451rds3n9r_x9g/T/solr.store.blob.SharedStorageSplitTest_E4343DDDB931B9AE-001/tempDir-001/node1/./livesplit1_shard1_1_replica_s4/data/index/ has changed since Blob pull started. Aborting pull.
at org.apache.solr.store.blob.util.BlobStoreUtils.syncLocalCoreWithSharedStore(BlobStoreUtils.java:128)
at org.apache.solr.update.processor.DistributedZkUpdateProcessor.readFromSharedStoreIfNecessary(DistributedZkUpdateProcessor.java:1096)
at org.apache.solr.update.processor.DistributedZkUpdateProcessor.processCommit(DistributedZkUpdateProcessor.java:202)
at org.apache.solr.update.processor.LogUpdateProcessorFactory$LogUpdateProcessor.processCommit(LogUpdateProcessorFactory.java:160)
at org.apache.solr.handler.RequestHandlerUtils.handleCommit(RequestHandlerUtils.java:69)
at org.apache.solr.handler.ContentStreamHandlerBase.handleRequestBody(ContentStreamHandlerBase.java:62)
at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:200)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:2609)
at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:816)
{code}
Best guess is that this is caused by lack of concurrency support that needs to still be addressed in the blob puller/pusher code.
> Shared storage online split support
> -----------------------------------
>
> Key: SOLR-13813
> URL: https://issues.apache.org/jira/browse/SOLR-13813
> Project: Solr
> Issue Type: Sub-task
> Reporter: Yonik Seeley
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The strategy for online shard splitting is the same as that for normal (non SHARED shards.)
> During a split, the leader will forward updates to sub-shard leaders, those updates will be buffered by the transaction log while the split is in progress, and then the buffered updates are replayed.
> One change that was added was to push the local index to blob store after buffered updates are applied (but before it is marked as ACTIVE):
> See https://github.com/apache/lucene-solr/commit/fe17c813f5fe6773c0527f639b9e5c598b98c7d4#diff-081b7c2242d674bb175b41b6afc21663
> This issue is about adding tests and ensuring that online shard splitting (while updates are flowing) works reliably.
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