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Posted to oak-issues@jackrabbit.apache.org by "Timothee Maret (JIRA)" <ji...@apache.org> on 2016/10/10 15:22:20 UTC
[jira] [Commented] (OAK-4917) DefaultStandbyReferencesReader does
not re-attempt to read segment upon failure
[ https://issues.apache.org/jira/browse/OAK-4917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15562564#comment-15562564 ]
Timothee Maret commented on OAK-4917:
-------------------------------------
Looking a bit further, both readers ({{DefaultStandbyHeadReader}} and {{DefaultStandbyReferencesReader}}) do go through the {{org.apache.jackrabbit.oak.segment.file.FileStore}} in order to fetch data.
However, both methods seem to use different caches.
The root cause of this issue seems to be those two cache not being in sync.
{{org.apache.jackrabbit.oak.segment.file.FileStore#getHead}} does use the CachingSegmentReader segment Reader.
{{org.apache.jackrabbit.oak.segment.file.FileStore#readSegment}} does use the SegmentCache segment cache in the FileStore.
> DefaultStandbyReferencesReader does not re-attempt to read segment upon failure
> --------------------------------------------------------------------------------
>
> Key: OAK-4917
> URL: https://issues.apache.org/jira/browse/OAK-4917
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: segment-tar
> Affects Versions: Segment Tar 0.0.14
> Reporter: Timothee Maret
> Fix For: Segment Tar 0.0.16
>
>
> This following logs occurred while running integration testing.
> {code}
> 07.10.2016 16:50:30.882 *DEBUG* [nioEventLoopGroup-3-2] org.apache.jackrabbit.oak.segment.standby.codec.GetHeadResponseEncoder Sending head 9d91bcd2-c4e0-4411-a0e0-d358fff02afc.00000020 to client qastandby1
> 07.10.2016 16:50:30.885 *DEBUG* [nioEventLoopGroup-3-2] org.apache.jackrabbit.oak.segment.standby.codec.RequestDecoder Parsed 'get references' message
> 07.10.2016 16:50:30.885 *DEBUG* [nioEventLoopGroup-3-2] org.apache.jackrabbit.oak.segment.standby.server.GetReferencesRequestHandler Reading references of segment 9d91bcd2-c4e0-4411-a0e0-d358fff02afc for client qastandby1
> 07.10.2016 16:50:30.886 *WARN* [nioEventLoopGroup-3-2] org.apache.jackrabbit.oak.segment.standby.server.DefaultStandbyReferencesReader Unable to read segment 9d91bcd2-c4e0-4411-a0e0-d358fff02afc
> org.apache.jackrabbit.oak.segment.SegmentNotFoundException: Segment 9d91bcd2-c4e0-4411-a0e0-d358fff02afc not found
> at org.apache.jackrabbit.oak.segment.file.FileStore$18.call(FileStore.java:1364)
> at org.apache.jackrabbit.oak.segment.file.FileStore$18.call(FileStore.java:1304)
> at org.apache.jackrabbit.oak.cache.CacheLIRS$Segment.load(CacheLIRS.java:1013)
> at org.apache.jackrabbit.oak.cache.CacheLIRS$Segment.get(CacheLIRS.java:974)
> at org.apache.jackrabbit.oak.cache.CacheLIRS.get(CacheLIRS.java:285)
> at org.apache.jackrabbit.oak.segment.SegmentCache.getSegment(SegmentCache.java:92)
> at org.apache.jackrabbit.oak.segment.file.FileStore.readSegment(FileStore.java:1304)
> at org.apache.jackrabbit.oak.segment.standby.server.DefaultStandbyReferencesReader.readSegment(DefaultStandbyReferencesReader.java:66)
> at org.apache.jackrabbit.oak.segment.standby.server.DefaultStandbyReferencesReader.readReferences(DefaultStandbyReferencesReader.java:49)
> at org.apache.jackrabbit.oak.segment.standby.server.GetReferencesRequestHandler.channelRead0(GetReferencesRequestHandler.java:41)
> at org.apache.jackrabbit.oak.segment.standby.server.GetReferencesRequestHandler.channelRead0(GetReferencesRequestHandler.java:27)
> at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
> at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:108)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
> at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:108)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
> at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:108)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
> at org.apache.jackrabbit.oak.segment.standby.server.RequestObserverHandler.channelRead(RequestObserverHandler.java:53)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
> at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
> at org.apache.jackrabbit.oak.segment.standby.server.StateHandler.channelRead(StateHandler.java:62)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
> at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
> at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
> at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:293)
> at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:267)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
> at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
> at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1294)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
> at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:911)
> at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
> at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:611)
> at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:552)
> at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:466)
> at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:438)
> at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:140)
> at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144)
> at java.lang.Thread.run(Thread.java:745)
> 07.10.2016 16:50:30.887 *DEBUG* [nioEventLoopGroup-3-2] org.apache.jackrabbit.oak.segment.standby.server.GetReferencesRequestHandler References for segment 9d91bcd2-c4e0-4411-a0e0-d358fff02afc not found, discarding request from client qastandby1
> 07.10.2016 16:50:32.216 *DEBUG* [TarMK flush [/Users/tmaret/Desktop/qa/quick-provider-scenarios/py/coldstandby/target/primary/crx-quickstart/repository/segmentstore]] org.apache.jackrabbit.oak.segment.SegmentBufferWriter Writing data segment: id=9d91bcd2-c4e0-4411-a0e0-d358fff02afc,size=6192,segmentIdCount=28,recordIdCount=126,recordCount=33
> 07.10.2016 16:50:32.216 *DEBUG* [TarMK flush [/Users/tmaret/Desktop/qa/quick-provider-scenarios/py/coldstandby/target/primary/crx-quickstart/repository/segmentstore]] org.apache.jackrabbit.oak.segment.file.TarWriter Writing segment 9d91bcd2-c4e0-4411-a0e0-d358fff02afc to /Users/tmaret/Desktop/qa/quick-provider-scenarios/py/coldstandby/target/primary/crx-quickstart/repository/segmentstore/data00007a.tar
> 07.10.2016 16:50:32.217 *DEBUG* [TarMK flush [/Users/tmaret/Desktop/qa/quick-provider-scenarios/py/coldstandby/target/primary/crx-quickstart/repository/segmentstore]] org.apache.jackrabbit.oak.segment.file.TarRevisions TarMK journal update 36c81550-4988-4658-abba-d27b744832c7.00000033 -> 9d91bcd2-c4e0-4411-a0e0-d358fff02afc.00000020
> {code}
> The IT test includes a primary instance and a standby instance.
> The standby instance fetches the HEAD from the primary instance which returns the segment {{9d91bcd2-c4e0-4411-a0e0-d358fff02afc}}. When the secondary attempts to get the segment {{9d91bcd2-c4e0-4411-a0e0-d358fff02afc}} from the primary instance, the primary instance fails to load the segment.
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