[jira] [Created] (SOLR-13896) Paused a non-leader node can cause recovery on other nodes

["Cao Manh Dat (Jira)" <ji...@apache.org>]

Cao Manh Dat created SOLR-13896:
-----------------------------------

             Summary: 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: Cao Manh Dat


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}

 

 



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