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From "Andrzej Bialecki (Jira)" <j...@apache.org>
Subject [jira] [Assigned] (SOLR-13896) Paused a non-leader node can cause recovery on other nodes
Date Wed, 04 Dec 2019 11:20:00 GMT

     [ https://issues.apache.org/jira/browse/SOLR-13896?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrzej Bialecki reassigned SOLR-13896:
---------------------------------------

    Assignee: Andrzej Bialecki  (was: Cao Manh Dat)

> Paused a non-leader node can cause recovery on other nodes
> ----------------------------------------------------------
>
>                 Key: SOLR-13896
>                 URL: https://issues.apache.org/jira/browse/SOLR-13896
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Cao Manh Dat
>            Assignee: Andrzej Bialecki
>            Priority: Major
>         Attachments: SOLR-13896.patch
>
>
> All stacktraces below based on 7.5 branch. This problem still exist at 8.x branches.
Here is the scenario, we have 3 replicas
>  * L: the leader replica
>  * R: the normal replica
>  * P: the poor one which was paused then resumed
> L is trying to send data to R, P during that P get paused, here is what happen at L's
threads.
>  * Thread 1 is stucking at this line of StreamingSolrClients
> {code:java}
> public synchronized void blockUntilFinished() {
>   for (ConcurrentUpdateSolrClient client : solrClients.values()) {
>     client.blockUntilFinished();
>   }
> } {code}
> basically this thread is trying to wait for other sender threads to finish. Let's assume
that this is the content of *solrClients.values : [clientToP, clientToR]*
>  * Thread 2 coressponds to *clientToP* since P is paused, it doesn't close the connection.
it just keep the connection and never return any data backs to L. So this thread stuck with
this stack trace, waiting for response data from *P* (with timeout=600000ms)*.* Therefore
it cause the thread1 stuck at *clientToP.blockUntilFinished()*
> {code:java}
>     java.lang.Thread.State: RUNNABLE   java.lang.Thread.State: RUNNABLE at java.net.SocketInputStream.socketRead0(Native
Method) at java.net.SocketInputStream.socketRead(SocketInputStream.java:116) at java.net.SocketInputStream.read(SocketInputStream.java:171)
at java.net.SocketInputStream.read(SocketInputStream.java:141) at org.apache.http.impl.io.SessionInputBufferImpl.streamRead(SessionInputBufferImpl.java:137)
at org.apache.http.impl.io.SessionInputBufferImpl.fillBuffer(SessionInputBufferImpl.java:153)
at org.apache.http.impl.io.SessionInputBufferImpl.readLine(SessionInputBufferImpl.java:282)
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:138)
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:56)
at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:259) at
org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:163)
at org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:165) at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:273)
at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125) at org.apache.solr.util.stats.InstrumentedHttpRequestExecutor.execute(InstrumentedHttpRequestExecutor.java:120)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:272) at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89) at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:111)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185) at
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83) at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
at org.apache.solr.client.solrj.impl.ConcurrentUpdateSolrClient$Runner.sendUpdateStream(ConcurrentUpdateSolrClient.java:347){code}
>  * Since *clientToR* is the second element of the array,   is never get called (or
at least after the timeout). This problem cause Thread 3, to stuck at this line
> {code:java}
> upd = queue.poll(pollQueueTime, TimeUnit.MILLISECONDS); {code}
> note that pollQueueTime == Integer.MAX_VALUE (this set by StreamingSolrClients). Therefore
unless clientToR.blockUntilFinished() is called (which interrupt Thread 3) this Thread 3 will
stuck at above line forever
>  * because *clientToR* is sending data to R but never close the outputstream, so basically
R just waiting forever (until timeout at 120000ms later). Which then lead to this exception
> {code:java}
> o.a.s.h.RequestHandlerBase java.io.IOException: java.util.concurrent.TimeoutException:
Idle timeout expired: 120003/120000 mso.a.s.h.RequestHandlerBase java.io.IOException: java.util.concurrent.TimeoutException:
Idle timeout expired: 120003/120000 ms at org.eclipse.jetty.server.HttpInput$ErrorState.noContent(HttpInput.java:1080)
at org.eclipse.jetty.server.HttpInput.read(HttpInput.java:313) at org.apache.solr.servlet.ServletInputStreamWrapper.read(ServletInputStreamWrapper.java:74)
at org.apache.commons.io.input.ProxyInputStream.read(ProxyInputStream.java:100) at org.apache.solr.common.util.FastInputStream.readWrappedStream(FastInputStream.java:79)
at org.apache.solr.common.util.FastInputStream.refill(FastInputStream.java:88) at org.apache.solr.common.util.FastInputStream.peek(FastInputStream.java:60)
at org.apache.solr.handler.loader.JavabinLoader.parseAndLoadDocs(JavabinLoader.java:107) at
org.apache.solr.handler.loader.JavabinLoader.load(JavabinLoader.java:55) {code}
>  * After that the leader put all replicas including none-paused one to recovery
>   
> It is a very bad outcome and, this is not just theoretical problem since some cloud platforms
can freeze a node when doing maintenance.
> Thanks [~ab]  and [~shalin] on helping me debugging this problem.
>   



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